* kernel 4.10-rcx iio helper question [not found] <03B5A3CA1724CE4EAC32B27E39292A677FC7512D3A@AUSMAIL1.AUS.ADVANTECH.CORP> @ 2017-01-31 18:19 ` Ken.Lin 2017-01-31 21:04 ` Daniel Baluta ` (2 more replies) 0 siblings, 3 replies; 9+ messages in thread From: Ken.Lin @ 2017-01-31 18:19 UTC (permalink / raw) To: jic23 Cc: peda, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang Hi, I find the latest kernel introduces new iio sys attributes. https://patchwork.kernel.org/patch/9391771/ https://patchwork.kernel.org/patch/9391259/ Is there anyone has some ideas about how the new iio sys attribute - in_pressure_scale_available works? I'm not sure if it's the regression issue or it's just the usage issue or something when I tried to read in_pressure_scale_available attribute. # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available Segmentation fault [ 3785.077014] Unable to handle kernel NULL pointer dereference at virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ 3785.087929] [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: 80000007 [#1] SMP ARM [ 3785.096806] Modules linked in: [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted 4.10.0-rc5-00009-gffd8858-dirty #3 [ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) [ 3785.114285] task: ed54ec00 task.stack: ee2bc000 [ 3785.118834] PC is at 0x0 [ 3785.121397] LR is at iio_read_channel_info_avail+0x40/0x280 [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d Table: 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, stack limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to 0xee2be000) [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 c016d394 ed54ec00 00000000 [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ 3785.204488] de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ 3785.245491] dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ 3785.286493] df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 00000000 [ 3785.335679] Backtrace: [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] (dev_attr_show) from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from [<c021e870>] (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- Thank you Cheers, Ken Lin -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: kernel 4.10-rcx iio helper question 2017-01-31 18:19 ` kernel 4.10-rcx iio helper question Ken.Lin @ 2017-01-31 21:04 ` Daniel Baluta [not found] ` <WM!cb84adc24d4b694e42f5535ae9108b815b5e1328dd6933c4d96c929736ce170395a21d6f8dce13715d8a612d4dbb441a!@dg.advantech.com> 2017-01-31 21:06 ` Jonathan Cameron [not found] ` <273c851c-4623-652e-097b-5a3827205ebc@axentia.se> 2 siblings, 1 reply; 9+ messages in thread From: Daniel Baluta @ 2017-01-31 21:04 UTC (permalink / raw) To: Ken.Lin Cc: jic23, peda, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang On Tue, Jan 31, 2017 at 8:19 PM, Ken.Lin <ken.lin@advantech.com> wrote: > Hi, > > I find the latest kernel introduces new iio sys attributes. > https://patchwork.kernel.org/patch/9391771/ > https://patchwork.kernel.org/patch/9391259/ > > Is there anyone has some ideas about how the new iio sys attribute - in_pressure_scale_available works? > I'm not sure if it's the regression issue or it's just the usage issue or something when I tried to read in_pressure_scale_available attribute. > > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available > Segmentation fault > > [ 3785.077014] Unable to handle kernel NULL pointer dereference at virtual address 00000000 > [ 3785.085138] pgd = ecc3c000 > [ 3785.087929] [00000000] *pgd=87f91831 > [ 3785.091563] Internal error: Oops: 80000007 [#1] SMP ARM > [ 3785.096806] Modules linked in: > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted 4.10.0-rc5-00009-gffd8858-dirty #3 > [ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device Tree) > [ 3785.114285] task: ed54ec00 task.stack: ee2bc000 > [ 3785.118834] PC is at 0x0 > [ 3785.121397] LR is at iio_read_channel_info_avail+0x40/0x280 > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 > [ 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 > [ 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : ed79f000 > [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc r0 : ee8d1000 > [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM Segment none > [ 3785.163971] Control: 10c5387d Table: 3cc3c04a DAC: 00000051 > [ 3785.169734] Process cat (pid: 1051, stack limit = 0xee2bc210) > [ 3785.175497] Stack: (0xee2bdda8 to 0xee2be000) > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 c016d394 ed54ec00 00000000 > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 00000fff 00001000 ee8d1018 > [ 3785.196286] dde0: ed79f000 c0a53c74 ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 > [ 3785.204488] de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 ed413780 > [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 ee2bde4c ee2bde40 c0291d00 c02933f0 > [ 3785.220889] de40: ee2bde9c ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 > [ 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 c0a111fc edffd540 ed413780 > [ 3785.237289] de80: b6e37000 00020000 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 > [ 3785.245491] dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 00020000 > [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 c021d158 c0292770 c0117764 b6e36004 > [ 3785.261893] dee0: c0f0d7c4 ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 > [ 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 ee2bdf20 c016ba04 c0171080 > [ 3785.278292] df20: 00000000 00020000 ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 > [ 3785.286493] df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 ed413780 > [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 c021e870 c021e71c 00000000 00000000 > [ 3785.302892] df80: 00020000 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 > [ 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 b6e37000 00020000 0001a2b4 > [ 3785.319292] dfc0: 00020000 00020000 b6e37000 00000003 7fffe000 00000000 00000000 00020000 > [ 3785.327492] dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 00000000 > [ 3785.335679] Backtrace: > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from [<c0513c58>] (dev_attr_show+0x24/0x50) > [ 3785.347162] r10:c0a53c74 r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 > [ 3785.355005] r4:edffd480 > [ 3785.357571] [<c0513c34>] (dev_attr_show) from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) > [ 3785.365764] r5:edffd540 r4:edffd480 > [ 3785.369365] [<c02933e4>] (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) > [ 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 r6:ed413780 r5:00000001 > [ 3785.385498] r4:ee2bde60 r3:c02933e4 > [ 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] (seq_read+0x1a4/0x4e0) > [ 3785.396780] [<c02465f8>] (seq_read) from [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) > [ 3785.404460] r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 r5:edffd540 > [ 3785.412303] r4:c0a111fc > [ 3785.414862] [<c0292764>] (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) > [ 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 r6:ed413780 r5:b6e37000 > [ 3785.430470] r4:c0a111fc > [ 3785.433029] [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) > [ 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 r4:00020000 > [ 3785.446909] [<c021e710>] (vfs_read) from [<c021e870>] (SyS_read+0x44/0x90) > [ 3785.453804] r8:00020000 r7:ed413780 r6:ed413780 r5:00000000 r4:00000000 > [ 3785.460537] [<c021e82c>] (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) > [ 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 r5:00020000 r4:00020000 > [ 3785.476238] Code: bad PC value > [ 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- Hi Ken, What sensor are you using? ^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <WM!cb84adc24d4b694e42f5535ae9108b815b5e1328dd6933c4d96c929736ce170395a21d6f8dce13715d8a612d4dbb441a!@dg.advantech.com>]
[parent not found: <03B5A3CA1724CE4EAC32B27E39292A677FC7512DF4@AUSMAIL1.AUS.ADVANTECH.CORP>]
* RE: kernel 4.10-rcx iio helper question [not found] ` <03B5A3CA1724CE4EAC32B27E39292A677FC7512DF4@AUSMAIL1.AUS.ADVANTECH.CORP> @ 2017-01-31 21:18 ` Ken.Lin 2017-01-31 22:01 ` Jonathan Cameron 0 siblings, 1 reply; 9+ messages in thread From: Ken.Lin @ 2017-01-31 21:18 UTC (permalink / raw) To: Daniel Baluta Cc: jic23, peda, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang Hi Daniel, Thank you for your feedback. We use a mpl3115A2 sensor for our project platform. Cheers, Ken Lin > -----Original Message----- > From: Daniel Baluta [mailto:daniel.baluta@gmail.com] > Sent: Tuesday, January 31, 2017 1:05 PM > To: Ken.Lin > Cc: jic23@kernel.org; peda@axentia.se; knaack.h@gmx.de; > pmeerw@pmeerw.net; linux-iio@vger.kernel.org; linux-kernel@vger.kernel.org; > Akshay Bhat; Peter.Stretz; Peter.Chiang > Subject: Re: kernel 4.10-rcx iio helper question > > On Tue, Jan 31, 2017 at 8:19 PM, Ken.Lin <ken.lin@advantech.com> wrote: > > Hi, > > > > I find the latest kernel introduces new iio sys attributes. > > https://patchwork.kernel.org/patch/9391771/ > > https://patchwork.kernel.org/patch/9391259/ > > > > Is there anyone has some ideas about how the new iio sys attribute - > in_pressure_scale_available works? > > I'm not sure if it's the regression issue or it's just the usage issue or something > when I tried to read in_pressure_scale_available attribute. > > > > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available > > Segmentation fault > > > > [ 3785.077014] Unable to handle kernel NULL pointer dereference at > > virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ 3785.087929] > > [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: 80000007 > > [#1] SMP ARM [ 3785.096806] Modules linked in: > > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted > > 4.10.0-rc5-00009-gffd8858-dirty #3 [ 3785.107740] Hardware name: > > Freescale i.MX6 Quad/DualLite (Device Tree) [ 3785.114285] task: > > ed54ec00 task.stack: ee2bc000 [ 3785.118834] PC is at 0x0 [ > > 3785.121397] LR is at iio_read_channel_info_avail+0x40/0x280 > > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 > > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ > > 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ > > 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : > > ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc > > r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode > > SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d Table: > > 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, stack > > limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to 0xee2be000) > > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 c016d394 > ed54ec00 00000000 > > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 > > 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 > > ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ 3785.204488] > > de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 > > ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 > > ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c > > ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ > > 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 > > c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 > > 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ 3785.245491] > > dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 > > 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 > > c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 > > ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ > > 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 > > ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 > > ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ 3785.286493] > > df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 > > ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 > c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 > 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ > 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 > b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 > b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] > dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 > 00000000 [ 3785.335679] Backtrace: > > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from > > [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 > > r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ > > 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] (dev_attr_show) > > from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] > > r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] > > (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ > > 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 > > r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ > > 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] > > (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from > > [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] > > r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 > > r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] > > (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ > > 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 > > r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] > > [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ > > 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 > > r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from [<c021e870>] > > (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 > > r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] > > (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ > > 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 > > r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ > > 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- > > > Hi Ken, > > What sensor are you using? > > -- > This message has been scanned for viruses and dangerous content by > MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: kernel 4.10-rcx iio helper question 2017-01-31 21:18 ` Ken.Lin @ 2017-01-31 22:01 ` Jonathan Cameron 0 siblings, 0 replies; 9+ messages in thread From: Jonathan Cameron @ 2017-01-31 22:01 UTC (permalink / raw) To: Ken.Lin, Daniel Baluta Cc: jic23, peda, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang On 31 January 2017 21:18:09 GMT+00:00, "Ken.Lin" <ken.lin@advantech.com> wrote: >Hi Daniel, > >Thank you for your feedback. >We use a mpl3115A2 sensor for our project platform. > Hmm. That shouldn't be creating the attribute for you to read in the first place. Are we talking about a modified driver? > >Cheers, >Ken Lin > >> -----Original Message----- >> From: Daniel Baluta [mailto:daniel.baluta@gmail.com] >> Sent: Tuesday, January 31, 2017 1:05 PM >> To: Ken.Lin >> Cc: jic23@kernel.org; peda@axentia.se; knaack.h@gmx.de; >> pmeerw@pmeerw.net; linux-iio@vger.kernel.org; >linux-kernel@vger.kernel.org; >> Akshay Bhat; Peter.Stretz; Peter.Chiang >> Subject: Re: kernel 4.10-rcx iio helper question >> >> On Tue, Jan 31, 2017 at 8:19 PM, Ken.Lin <ken.lin@advantech.com> >wrote: >> > Hi, >> > >> > I find the latest kernel introduces new iio sys attributes. >> > https://patchwork.kernel.org/patch/9391771/ >> > https://patchwork.kernel.org/patch/9391259/ >> > >> > Is there anyone has some ideas about how the new iio sys attribute >- >> in_pressure_scale_available works? >> > I'm not sure if it's the regression issue or it's just the usage >issue or something >> when I tried to read in_pressure_scale_available attribute. >> > >> > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available >> > Segmentation fault >> > >> > [ 3785.077014] Unable to handle kernel NULL pointer dereference at >> > virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ >3785.087929] >> > [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: >80000007 >> > [#1] SMP ARM [ 3785.096806] Modules linked in: >> > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted >> > 4.10.0-rc5-00009-gffd8858-dirty #3 [ 3785.107740] Hardware name: >> > Freescale i.MX6 Quad/DualLite (Device Tree) [ 3785.114285] task: >> > ed54ec00 task.stack: ee2bc000 [ 3785.118834] PC is at 0x0 [ >> > 3785.121397] LR is at iio_read_channel_info_avail+0x40/0x280 >> > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: >a0070013 >> > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ >> > 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ >> > 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : >> > ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc >> > r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode >> > SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d >Table: >> > 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, >stack >> > limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to >0xee2be000) >> > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 >c016d394 >> ed54ec00 00000000 >> > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 >> > 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 >> > ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ >3785.204488] >> > de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 >00000001 >> > ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 >> > ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c >> > ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ >> > 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 >> > c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 >> > 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ >3785.245491] >> > dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 >ee2bdf78 >> > 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 >> > c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 >> > ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ >> > 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 >> > ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 >> > ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ >3785.286493] >> > df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 >00000000 >> > ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 >> c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 >> 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ >> 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 >> b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 >> b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] >> dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 >> 00000000 [ 3785.335679] Backtrace: >> > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from >> > [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 >> > r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ >> > 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] >(dev_attr_show) >> > from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] >> > r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] >> > (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ >> > 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 >> > r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ >> > 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] >> > (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from >> > [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] >> > r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 >> > r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] >> > (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ >> > 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 >> > r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] >> > [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ >> > 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 >> > r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from >[<c021e870>] >> > (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 >> > r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] >> > (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ >> > 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 >> > r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ >> > 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- >> >> >> Hi Ken, >> >> What sensor are you using? >> >> -- >> This message has been scanned for viruses and dangerous content by >> MailScanner, and is believed to be clean. > > >-- >This message has been scanned for viruses and >dangerous content by MailScanner, and is >believed to be clean. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: kernel 4.10-rcx iio helper question 2017-01-31 18:19 ` kernel 4.10-rcx iio helper question Ken.Lin 2017-01-31 21:04 ` Daniel Baluta @ 2017-01-31 21:06 ` Jonathan Cameron [not found] ` <273c851c-4623-652e-097b-5a3827205ebc@axentia.se> 2 siblings, 0 replies; 9+ messages in thread From: Jonathan Cameron @ 2017-01-31 21:06 UTC (permalink / raw) To: Ken.Lin, jic23 Cc: peda, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang On 31 January 2017 18:19:12 GMT+00:00, "Ken.Lin" <ken.lin@advantech.com> wrote: >Hi, > >I find the latest kernel introduces new iio sys attributes. >https://patchwork.kernel.org/patch/9391771/ >https://patchwork.kernel.org/patch/9391259/ > >Is there anyone has some ideas about how the new iio sys attribute - >in_pressure_scale_available works? >I'm not sure if it's the regression issue or it's just the usage issue >or something when I tried to read in_pressure_scale_available >attribute. > ># cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available >Segmentation fault Hi Ken, what driver was this with? Hardly any should be creating the attrs that use this at the moment. Looks like something odd is going on. Jonathan > >[ 3785.077014] Unable to handle kernel NULL pointer dereference at >virtual address 00000000 >[ 3785.085138] pgd = ecc3c000 >[ 3785.087929] [00000000] *pgd=87f91831 >[ 3785.091563] Internal error: Oops: 80000007 [#1] SMP ARM >[ 3785.096806] Modules linked in: >[ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted >4.10.0-rc5-00009-gffd8858-dirty #3 >[ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device >Tree) >[ 3785.114285] task: ed54ec00 task.stack: ee2bc000 >[ 3785.118834] PC is at 0x0 >[ 3785.121397] LR is at iio_read_channel_info_avail+0x40/0x280 >[ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 >[ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 >[ 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 >[ 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : >ed79f000 >[ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc r0 : >ee8d1000 >[ 3785.156820] Flags: NzCv IRQs on FIQs on Mode SVC_32 ISA ARM >Segment none >[ 3785.163971] Control: 10c5387d Table: 3cc3c04a DAC: 00000051 >[ 3785.169734] Process cat (pid: 1051, stack limit = 0xee2bc210) >[ 3785.175497] Stack: (0xee2bdda8 to 0xee2be000) >[ 3785.179880] dda0: ee2bddc0 00000002 c016d720 >c016d394 ed54ec00 00000000 >[ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 >00000fff 00001000 ee8d1018 >[ 3785.196286] dde0: ed79f000 c0a53c74 ee2bde0c ee2bddf8 c0513c58 >c06fbbe8 edffd480 edffd540 >[ 3785.204488] de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 >ee2bde60 00000001 ed413780 >[ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 ee2bde4c >ee2bde40 c0291d00 c02933f0 >[ 3785.220889] de40: ee2bde9c ee2bde50 c024679c c0291ce0 edffd4b0 >b6e37000 00020000 ee2bdf78 >[ 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 >c0a111fc edffd540 ed413780 >[ 3785.237289] de80: b6e37000 00020000 00020000 ee2bdf78 ee2bded4 >ee2bdea0 c0292890 c0246604 >[ 3785.245491] dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 >ed413780 ee2bdf78 00020000 >[ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 c021d158 >c0292770 c0117764 b6e36004 >[ 3785.261893] dee0: c0f0d7c4 ee2bdfb0 b6f89228 00021008 ee2bdfac >ee2bdf00 c0101374 c0117770 >[ 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 >ee2bdf20 c016ba04 c0171080 >[ 3785.278292] df20: 00000000 00020000 ed413780 b6e37000 00000000 >ee2bdf78 ee2bdf74 ee2bdf48 >[ 3785.286493] df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 >00000000 00000000 ed413780 >[ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 c021e870 >c021e71c 00000000 00000000 >[ 3785.302892] df80: 00020000 00020000 b6e37000 00000003 c0108084 >00000000 00000000 ee2bdfa8 >[ 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 >b6e37000 00020000 0001a2b4 >[ 3785.319292] dfc0: 00020000 00020000 b6e37000 00000003 7fffe000 >00000000 00000000 00020000 >[ 3785.327492] dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 >00000003 00000000 00000000 >[ 3785.335679] Backtrace: >[ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from >[<c0513c58>] (dev_attr_show+0x24/0x50) >[ 3785.347162] r10:c0a53c74 r9:ed79f000 r8:ee8d1018 r7:00001000 >r6:00000fff r5:ee8b9a00 >[ 3785.355005] r4:edffd480 >[ 3785.357571] [<c0513c34>] (dev_attr_show) from [<c0293474>] >(sysfs_kf_seq_show+0x90/0x110) >[ 3785.365764] r5:edffd540 r4:edffd480 >[ 3785.369365] [<c02933e4>] (sysfs_kf_seq_show) from [<c0291d00>] >(kernfs_seq_show+0x2c/0x30) >[ 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 >r6:ed413780 r5:00000001 >[ 3785.385498] r4:ee2bde60 r3:c02933e4 >[ 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] >(seq_read+0x1a4/0x4e0) >[ 3785.396780] [<c02465f8>] (seq_read) from [<c0292890>] >(kernfs_fop_read+0x12c/0x1cc) >[ 3785.404460] r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 >r6:ed413780 r5:edffd540 >[ 3785.412303] r4:c0a111fc >[ 3785.414862] [<c0292764>] (kernfs_fop_read) from [<c021d158>] >(__vfs_read+0x34/0x118) >[ 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 >r6:ed413780 r5:b6e37000 >[ 3785.430470] r4:c0a111fc >[ 3785.433029] [<c021d124>] (__vfs_read) from [<c021e7a0>] >(vfs_read+0x90/0x11c) >[ 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 >r4:00020000 >[ 3785.446909] [<c021e710>] (vfs_read) from [<c021e870>] >(SyS_read+0x44/0x90) >[ 3785.453804] r8:00020000 r7:ed413780 r6:ed413780 r5:00000000 >r4:00000000 >[ 3785.460537] [<c021e82c>] (SyS_read) from [<c0107ee0>] >(ret_fast_syscall+0x0/0x1c) >[ 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 >r5:00020000 r4:00020000 >[ 3785.476238] Code: bad PC value >[ 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- > >Thank you > >Cheers, >Ken Lin -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <273c851c-4623-652e-097b-5a3827205ebc@axentia.se>]
[parent not found: <WM!c988294410704f5fdb6034485f95e283ba8a11561dded8460b8f9f4c302e8d9d3b5dfd6fbd89ee21c83838f1af88f482!@dg.advantech.com>]
[parent not found: <03B5A3CA1724CE4EAC32B27E39292A677FC7512E85@AUSMAIL1.AUS.ADVANTECH.CORP>]
* RE: kernel 4.10-rcx iio helper question [not found] ` <03B5A3CA1724CE4EAC32B27E39292A677FC7512E85@AUSMAIL1.AUS.ADVANTECH.CORP> @ 2017-02-01 0:42 ` Ken.Lin 2017-02-01 6:50 ` Jonathan Cameron [not found] ` <28916f18-da40-cf0a-5bfa-2c8d53a7d83c@axentia.se> 0 siblings, 2 replies; 9+ messages in thread From: Ken.Lin @ 2017-02-01 0:42 UTC (permalink / raw) To: Peter Rosin, jic23 Cc: knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang > -----Original Message----- > From: Peter Rosin [mailto:peda@axentia.se] > Sent: Tuesday, January 31, 2017 1:10 PM > To: Ken.Lin; jic23@kernel.org > Cc: knaack.h@gmx.de; pmeerw@pmeerw.net; linux-iio@vger.kernel.org; linux- > kernel@vger.kernel.org; Akshay Bhat; Peter.Stretz; Peter.Chiang > Subject: Re: kernel 4.10-rcx iio helper question > > On 2017-01-31 19:19, Ken.Lin wrote: > > Hi, > > > > I find the latest kernel introduces new iio sys attributes. > > https://patchwork.kernel.org/patch/9391771/ > > https://patchwork.kernel.org/patch/9391259/ > > > > Is there anyone has some ideas about how the new iio sys attribute - > in_pressure_scale_available works? > > I'm not sure if it's the regression issue or it's just the usage issue or something > when I tried to read in_pressure_scale_available attribute. > > > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available > > Segmentation fault > > What driver is providing iio:device1? > > > [ 3785.077014] Unable to handle kernel NULL pointer dereference at > > virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ 3785.087929] > > [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: 80000007 > > [#1] SMP ARM [ 3785.096806] Modules linked in: > > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted > > 4.10.0-rc5-00009-gffd8858-dirty #3 > > Looks like you have a couple of local changes? What are those? > I didn't make any changes to the iio drivers locally and MPL3115A2 pressure/temperature sensor driver (drivers/iio/pressure/mpl3115.c) is the driver which provides iio:device1. > My WAG is that you added the IIO_CHAN_INFO_SCALE bit to one of the > .info_mask_*_available fields in the channel spec but failed to provide a > .read_avail operation in the driver. Am I close? > I could read iio:device0/in_accel_scale and device0/in_accel_available, which are provided by NXP 3-axis accelerometers driver (drivers/iio/accel/mma8452.c). The attribute iio:/device1/in_pressure_scale is missing unless I reverted the commits. https://patchwork.kernel.org/patch/9391771/ https://patchwork.kernel.org/patch/9391259/ Cheers, Ken Lin > Cheers, > peda > > > [ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device > > Tree) [ 3785.114285] task: ed54ec00 task.stack: ee2bc000 [ > > 3785.118834] PC is at 0x0 [ 3785.121397] LR is at > > iio_read_channel_info_avail+0x40/0x280 > > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: a0070013 > > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ > > 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ > > 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : > > ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc > > r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode > > SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d Table: > > 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, stack > > limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to 0xee2be000) > > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 c016d394 > ed54ec00 00000000 > > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 > > 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 > > ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ 3785.204488] > > de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 00000001 > > ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 > > ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c > > ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ > > 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 > > c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 > > 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ 3785.245491] > > dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 ee2bdf78 > > 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 > > c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 > > ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ > > 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 > > ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 > > ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ 3785.286493] > > df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 00000000 > > ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 > c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 > 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ > 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 > b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 > b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] > dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 > 00000000 [ 3785.335679] Backtrace: > > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from > > [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 > > r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ > > 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] (dev_attr_show) > > from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] > > r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] > > (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ > > 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 > > r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ > > 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] > > (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from > > [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] > > r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 > > r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] > > (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ > > 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 > > r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] > > [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ > > 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 > > r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from [<c021e870>] > > (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 > > r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] > > (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ > > 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 > > r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ > > 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- > > > > Thank you > > > > Cheers, > > Ken Lin > > > > > -- > This message has been scanned for viruses and dangerous content by > MailScanner, and is believed to be clean. -- This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ^ permalink raw reply [flat|nested] 9+ messages in thread
* RE: kernel 4.10-rcx iio helper question 2017-02-01 0:42 ` Ken.Lin @ 2017-02-01 6:50 ` Jonathan Cameron 2017-02-01 8:03 ` Daniel Baluta [not found] ` <28916f18-da40-cf0a-5bfa-2c8d53a7d83c@axentia.se> 1 sibling, 1 reply; 9+ messages in thread From: Jonathan Cameron @ 2017-02-01 6:50 UTC (permalink / raw) To: Ken.Lin, Peter Rosin, jic23 Cc: knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang On 1 February 2017 00:42:31 GMT+00:00, "Ken.Lin" <ken.lin@advantech.com> wrote: > > >> -----Original Message----- >> From: Peter Rosin [mailto:peda@axentia.se] >> Sent: Tuesday, January 31, 2017 1:10 PM >> To: Ken.Lin; jic23@kernel.org >> Cc: knaack.h@gmx.de; pmeerw@pmeerw.net; linux-iio@vger.kernel.org; >linux- >> kernel@vger.kernel.org; Akshay Bhat; Peter.Stretz; Peter.Chiang >> Subject: Re: kernel 4.10-rcx iio helper question >> >> On 2017-01-31 19:19, Ken.Lin wrote: >> > Hi, >> > >> > I find the latest kernel introduces new iio sys attributes. >> > https://patchwork.kernel.org/patch/9391771/ >> > https://patchwork.kernel.org/patch/9391259/ >> > >> > Is there anyone has some ideas about how the new iio sys attribute >- >> in_pressure_scale_available works? >> > I'm not sure if it's the regression issue or it's just the usage >issue or something >> when I tried to read in_pressure_scale_available attribute. >> >> > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available >> > Segmentation fault >> >> What driver is providing iio:device1? >> >> > [ 3785.077014] Unable to handle kernel NULL pointer dereference at >> > virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ >3785.087929] >> > [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: >80000007 >> > [#1] SMP ARM [ 3785.096806] Modules linked in: >> > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted >> > 4.10.0-rc5-00009-gffd8858-dirty #3 >> >> Looks like you have a couple of local changes? What are those? >> > >I didn't make any changes to the iio drivers locally and MPL3115A2 >pressure/temperature sensor driver (drivers/iio/pressure/mpl3115.c) is >the driver which provides iio:device1. > >> My WAG is that you added the IIO_CHAN_INFO_SCALE bit to one of the >> .info_mask_*_available fields in the channel spec but failed to >provide a >> .read_avail operation in the driver. Am I close? >> > >I could read iio:device0/in_accel_scale and device0/in_accel_available, >which are provided by NXP 3-axis accelerometers driver >(drivers/iio/accel/mma8452.c). >The attribute iio:/device1/in_pressure_scale is missing unless I >reverted the commits. >https://patchwork.kernel.org/patch/9391771/ >https://patchwork.kernel.org/patch/9391259/ Getting weird. Any possibility you have a mix of modules with and without those patches? Would probably be mpl3115 without and industrialio with. The structure gained some bitmasks between previous masks. But if so I am little surprised it isn't causing worse issues. > >Cheers, >Ken Lin > >> Cheers, >> peda >> >> > [ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device >> > Tree) [ 3785.114285] task: ed54ec00 task.stack: ee2bc000 [ >> > 3785.118834] PC is at 0x0 [ 3785.121397] LR is at >> > iio_read_channel_info_avail+0x40/0x280 >> > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: >a0070013 >> > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ >> > 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ >> > 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : >> > ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc >> > r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode >> > SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d >Table: >> > 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, >stack >> > limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to >0xee2be000) >> > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 >c016d394 >> ed54ec00 00000000 >> > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 >> > 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 >> > ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ >3785.204488] >> > de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 >00000001 >> > ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 >> > ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c >> > ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ >> > 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 >> > c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 >> > 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ >3785.245491] >> > dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 >ee2bdf78 >> > 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 >> > c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 >> > ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ >> > 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 >> > ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 >> > ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ >3785.286493] >> > df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 >00000000 >> > ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 >> c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 >> 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ >> 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 >> b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 >> b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] >> dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 >> 00000000 [ 3785.335679] Backtrace: >> > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from >> > [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 >> > r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ >> > 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] >(dev_attr_show) >> > from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] >> > r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] >> > (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ >> > 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 >> > r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ >> > 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] >> > (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from >> > [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] >> > r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 >> > r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] >> > (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ >> > 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 >> > r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] >> > [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ >> > 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 >> > r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from >[<c021e870>] >> > (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 >> > r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] >> > (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ >> > 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 >> > r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ >> > 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- >> > >> > Thank you >> > >> > Cheers, >> > Ken Lin >> > >> >> >> -- >> This message has been scanned for viruses and dangerous content by >> MailScanner, and is believed to be clean. -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ^ permalink raw reply [flat|nested] 9+ messages in thread
* Re: kernel 4.10-rcx iio helper question 2017-02-01 6:50 ` Jonathan Cameron @ 2017-02-01 8:03 ` Daniel Baluta 0 siblings, 0 replies; 9+ messages in thread From: Daniel Baluta @ 2017-02-01 8:03 UTC (permalink / raw) To: Ken.Lin Cc: Peter Rosin, jic23, knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang, Jonathan Cameron Could you paste your drivers/iio/pressure/mpl3115.c code into pastebin.com and send us the result? thanks, Daniel. On Wed, Feb 1, 2017 at 8:50 AM, Jonathan Cameron <jic23@jic23.retrosnub.co.uk> wrote: > > > On 1 February 2017 00:42:31 GMT+00:00, "Ken.Lin" <ken.lin@advantech.com> wrote: >> >> >>> -----Original Message----- >>> From: Peter Rosin [mailto:peda@axentia.se] >>> Sent: Tuesday, January 31, 2017 1:10 PM >>> To: Ken.Lin; jic23@kernel.org >>> Cc: knaack.h@gmx.de; pmeerw@pmeerw.net; linux-iio@vger.kernel.org; >>linux- >>> kernel@vger.kernel.org; Akshay Bhat; Peter.Stretz; Peter.Chiang >>> Subject: Re: kernel 4.10-rcx iio helper question >>> >>> On 2017-01-31 19:19, Ken.Lin wrote: >>> > Hi, >>> > >>> > I find the latest kernel introduces new iio sys attributes. >>> > https://patchwork.kernel.org/patch/9391771/ >>> > https://patchwork.kernel.org/patch/9391259/ >>> > >>> > Is there anyone has some ideas about how the new iio sys attribute >>- >>> in_pressure_scale_available works? >>> > I'm not sure if it's the regression issue or it's just the usage >>issue or something >>> when I tried to read in_pressure_scale_available attribute. >>> >>> > # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available >>> > Segmentation fault >>> >>> What driver is providing iio:device1? >>> >>> > [ 3785.077014] Unable to handle kernel NULL pointer dereference at >>> > virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ >>3785.087929] >>> > [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: >>80000007 >>> > [#1] SMP ARM [ 3785.096806] Modules linked in: >>> > [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted >>> > 4.10.0-rc5-00009-gffd8858-dirty #3 >>> >>> Looks like you have a couple of local changes? What are those? >>> >> >>I didn't make any changes to the iio drivers locally and MPL3115A2 >>pressure/temperature sensor driver (drivers/iio/pressure/mpl3115.c) is >>the driver which provides iio:device1. >> >>> My WAG is that you added the IIO_CHAN_INFO_SCALE bit to one of the >>> .info_mask_*_available fields in the channel spec but failed to >>provide a >>> .read_avail operation in the driver. Am I close? >>> >> >>I could read iio:device0/in_accel_scale and device0/in_accel_available, >>which are provided by NXP 3-axis accelerometers driver >>(drivers/iio/accel/mma8452.c). >>The attribute iio:/device1/in_pressure_scale is missing unless I >>reverted the commits. >>https://patchwork.kernel.org/patch/9391771/ >>https://patchwork.kernel.org/patch/9391259/ > > Getting weird. Any possibility you have a mix of modules with and without those patches? > > Would probably be mpl3115 without and industrialio with. The structure gained some > bitmasks between previous masks. > > But if so I am little surprised it isn't causing worse issues. > >> >>Cheers, >>Ken Lin >> >>> Cheers, >>> peda >>> >>> > [ 3785.107740] Hardware name: Freescale i.MX6 Quad/DualLite (Device >>> > Tree) [ 3785.114285] task: ed54ec00 task.stack: ee2bc000 [ >>> > 3785.118834] PC is at 0x0 [ 3785.121397] LR is at >>> > iio_read_channel_info_avail+0x40/0x280 >>> > [ 3785.126992] pc : [<00000000>] lr : [<c06fbc1c>] psr: >>a0070013 >>> > [ 3785.126992] sp : ee2bdda8 ip : 00000000 fp : ee2bddf4 [ >>> > 3785.138490] r10: c0a53c74 r9 : ed79f000 r8 : ee8d1018 [ >>> > 3785.143733] r7 : 00001000 r6 : 00000fff r5 : ee8b9a00 r4 : >>> > ed79f000 [ 3785.150276] r3 : ee2bddc4 r2 : ee2bddbc r1 : c0a86dcc >>> > r0 : ee8d1000 [ 3785.156820] Flags: NzCv IRQs on FIQs on Mode >>> > SVC_32 ISA ARM Segment none [ 3785.163971] Control: 10c5387d >>Table: >>> > 3cc3c04a DAC: 00000051 [ 3785.169734] Process cat (pid: 1051, >>stack >>> > limit = 0xee2bc210) [ 3785.175497] Stack: (0xee2bdda8 to >>0xee2be000) >>> > [ 3785.179880] dda0: ee2bddc0 00000002 c016d720 >>c016d394 >>> ed54ec00 00000000 >>> > [ 3785.188084] ddc0: 60070013 ed413780 00000001 edffd480 ee8b9a00 >>> > 00000fff 00001000 ee8d1018 [ 3785.196286] dde0: ed79f000 c0a53c74 >>> > ee2bde0c ee2bddf8 c0513c58 c06fbbe8 edffd480 edffd540 [ >>3785.204488] >>> > de00: ee2bde3c ee2bde10 c0293474 c0513c40 c02933e4 ee2bde60 >>00000001 >>> > ed413780 [ 3785.212688] de20: 00000001 ed413780 00000000 edffd480 >>> > ee2bde4c ee2bde40 c0291d00 c02933f0 [ 3785.220889] de40: ee2bde9c >>> > ee2bde50 c024679c c0291ce0 edffd4b0 b6e37000 00020000 ee2bdf78 [ >>> > 3785.229089] de60: 00000000 00000000 ed54ec00 ed013200 00000817 >>> > c0a111fc edffd540 ed413780 [ 3785.237289] de80: b6e37000 00020000 >>> > 00020000 ee2bdf78 ee2bded4 ee2bdea0 c0292890 c0246604 [ >>3785.245491] >>> > dea0: c0117940 c016ba50 00000025 c0a111fc b6e37000 ed413780 >>ee2bdf78 >>> > 00020000 [ 3785.253691] dec0: ee2bc000 b6e37000 ee2bdf44 ee2bded8 >>> > c021d158 c0292770 c0117764 b6e36004 [ 3785.261893] dee0: c0f0d7c4 >>> > ee2bdfb0 b6f89228 00021008 ee2bdfac ee2bdf00 c0101374 c0117770 [ >>> > 3785.270093] df00: 00000000 00000000 ee2bc000 00000000 ee2bdf34 >>> > ee2bdf20 c016ba04 c0171080 [ 3785.278292] df20: 00000000 00020000 >>> > ed413780 b6e37000 00000000 ee2bdf78 ee2bdf74 ee2bdf48 [ >>3785.286493] >>> > df40: c021e7a0 c021d130 c023e300 c023e280 ee2bdf74 00000000 >>00000000 >>> > ed413780 [ 3785.294693] df60: ed413780 00020000 ee2bdfa4 ee2bdf78 >>> c021e870 c021e71c 00000000 00000000 [ 3785.302892] df80: 00020000 >>> 00020000 b6e37000 00000003 c0108084 00000000 00000000 ee2bdfa8 [ >>> 3785.311092] dfa0: c0107ee0 c021e838 00020000 00020000 00000003 >>> b6e37000 00020000 0001a2b4 [ 3785.319292] dfc0: 00020000 00020000 >>> b6e37000 00000003 7fffe000 00000000 00000000 00020000 [ 3785.327492] >>> dfe0: 00000000 be98eb4c 0000c740 b6f1985c 60070010 00000003 00000000 >>> 00000000 [ 3785.335679] Backtrace: >>> > [ 3785.338175] [<c06fbbdc>] (iio_read_channel_info_avail) from >>> > [<c0513c58>] (dev_attr_show+0x24/0x50) [ 3785.347162] r10:c0a53c74 >>> > r9:ed79f000 r8:ee8d1018 r7:00001000 r6:00000fff r5:ee8b9a00 [ >>> > 3785.355005] r4:edffd480 [ 3785.357571] [<c0513c34>] >>(dev_attr_show) >>> > from [<c0293474>] (sysfs_kf_seq_show+0x90/0x110) [ 3785.365764] >>> > r5:edffd540 r4:edffd480 [ 3785.369365] [<c02933e4>] >>> > (sysfs_kf_seq_show) from [<c0291d00>] (kernfs_seq_show+0x2c/0x30) [ >>> > 3785.377652] r10:edffd480 r9:00000000 r8:ed413780 r7:00000001 >>> > r6:ed413780 r5:00000001 [ 3785.385498] r4:ee2bde60 r3:c02933e4 [ >>> > 3785.389101] [<c0291cd4>] (kernfs_seq_show) from [<c024679c>] >>> > (seq_read+0x1a4/0x4e0) [ 3785.396780] [<c02465f8>] (seq_read) from >>> > [<c0292890>] (kernfs_fop_read+0x12c/0x1cc) [ 3785.404460] >>> > r10:ee2bdf78 r9:00020000 r8:00020000 r7:b6e37000 r6:ed413780 >>> > r5:edffd540 [ 3785.412303] r4:c0a111fc [ 3785.414862] [<c0292764>] >>> > (kernfs_fop_read) from [<c021d158>] (__vfs_read+0x34/0x118) [ >>> > 3785.422627] r10:b6e37000 r9:ee2bc000 r8:00020000 r7:ee2bdf78 >>> > r6:ed413780 r5:b6e37000 [ 3785.430470] r4:c0a111fc [ 3785.433029] >>> > [<c021d124>] (__vfs_read) from [<c021e7a0>] (vfs_read+0x90/0x11c) [ >>> > 3785.440185] r8:ee2bdf78 r7:00000000 r6:b6e37000 r5:ed413780 >>> > r4:00020000 [ 3785.446909] [<c021e710>] (vfs_read) from >>[<c021e870>] >>> > (SyS_read+0x44/0x90) [ 3785.453804] r8:00020000 r7:ed413780 >>> > r6:ed413780 r5:00000000 r4:00000000 [ 3785.460537] [<c021e82c>] >>> > (SyS_read) from [<c0107ee0>] (ret_fast_syscall+0x0/0x1c) [ >>> > 3785.468042] r10:00000000 r8:c0108084 r7:00000003 r6:b6e37000 >>> > r5:00020000 r4:00020000 [ 3785.476238] Code: bad PC value [ >>> > 3785.490358] ---[ end trace 9c4938ccd0389004 ]--- >>> > >>> > Thank you >>> > >>> > Cheers, >>> > Ken Lin >>> > >>> >>> >>> -- >>> This message has been scanned for viruses and dangerous content by >>> MailScanner, and is believed to be clean. > > -- > Sent from my Android device with K-9 Mail. Please excuse my brevity. > -- > To unsubscribe from this list: send the line "unsubscribe linux-iio" in > the body of a message to majordomo@vger.kernel.org > More majordomo info at http://vger.kernel.org/majordomo-info.html ^ permalink raw reply [flat|nested] 9+ messages in thread
[parent not found: <28916f18-da40-cf0a-5bfa-2c8d53a7d83c@axentia.se>]
* Re: kernel 4.10-rcx iio helper question [not found] ` <28916f18-da40-cf0a-5bfa-2c8d53a7d83c@axentia.se> @ 2017-02-01 17:25 ` Jonathan Cameron 0 siblings, 0 replies; 9+ messages in thread From: Jonathan Cameron @ 2017-02-01 17:25 UTC (permalink / raw) To: Peter Rosin, Ken.Lin, jic23 Cc: knaack.h, pmeerw, linux-iio, linux-kernel, Akshay Bhat, Peter.Stretz, Peter.Chiang On 1 February 2017 05:50:12 GMT+00:00, Peter Rosin <peda@axentia.se> wrote: >On 2017-02-01 01:42, Ken.Lin wrote: >> >> >>> -----Original Message----- >>> From: Peter Rosin [mailto:peda@axentia.se] >>> Sent: Tuesday, January 31, 2017 1:10 PM >>> To: Ken.Lin; jic23@kernel.org >>> Cc: knaack.h@gmx.de; pmeerw@pmeerw.net; linux-iio@vger.kernel.org; >linux- >>> kernel@vger.kernel.org; Akshay Bhat; Peter.Stretz; Peter.Chiang >>> Subject: Re: kernel 4.10-rcx iio helper question >>> >>> On 2017-01-31 19:19, Ken.Lin wrote: >>>> Hi, >>>> >>>> I find the latest kernel introduces new iio sys attributes. >>>> https://patchwork.kernel.org/patch/9391771/ >>>> https://patchwork.kernel.org/patch/9391259/ >>>> >>>> Is there anyone has some ideas about how the new iio sys attribute >- >>> in_pressure_scale_available works? >>>> I'm not sure if it's the regression issue or it's just the usage >issue or something >>> when I tried to read in_pressure_scale_available attribute. >>> >>>> # cat /sys/bus/iio/devices/iio\:device1/in_pressure_scale_available >>>> Segmentation fault >>> >>> What driver is providing iio:device1? >>> >>>> [ 3785.077014] Unable to handle kernel NULL pointer dereference at >>>> virtual address 00000000 [ 3785.085138] pgd = ecc3c000 [ >3785.087929] >>>> [00000000] *pgd=87f91831 [ 3785.091563] Internal error: Oops: >80000007 >>>> [#1] SMP ARM [ 3785.096806] Modules linked in: >>>> [ 3785.099892] CPU: 1 PID: 1051 Comm: cat Not tainted >>>> 4.10.0-rc5-00009-gffd8858-dirty #3 >>> >>> Looks like you have a couple of local changes? What are those? >>> >> >> I didn't make any changes to the iio drivers locally and MPL3115A2 >pressure/temperature sensor driver (drivers/iio/pressure/mpl3115.c) is >the driver which provides iio:device1. >> >>> My WAG is that you added the IIO_CHAN_INFO_SCALE bit to one of the >>> .info_mask_*_available fields in the channel spec but failed to >provide a >>> .read_avail operation in the driver. Am I close? >>> >> >> I could read iio:device0/in_accel_scale and >device0/in_accel_available, which are provided by NXP 3-axis >accelerometers driver (drivers/iio/accel/mma8452.c). >> The attribute iio:/device1/in_pressure_scale is missing unless I >reverted the commits. >> https://patchwork.kernel.org/patch/9391771/ >> https://patchwork.kernel.org/patch/9391259/ > >Whoops, sorry for suggesting you did something wrong... > >Can you try this patch? Gah. My eyes passed straight over that. Thanks Ken, nice regression report and thank peda for the fix. Phew, single driver bug rather than a general regression! Jonathan > >Cheers, >peda > >diff --git a/drivers/iio/pressure/mpl115.c >b/drivers/iio/pressure/mpl115.c >index 73f2f0c46e62..8f2bce213248 100644 >--- a/drivers/iio/pressure/mpl115.c >+++ b/drivers/iio/pressure/mpl115.c >@@ -137,6 +137,7 @@ static const struct iio_chan_spec mpl115_channels[] >= { > { > .type = IIO_TEMP, > .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), >+ .info_mask_shared_by_type = > BIT(IIO_CHAN_INFO_OFFSET) | BIT(IIO_CHAN_INFO_SCALE), > }, > }; >diff --git a/drivers/iio/pressure/mpl3115.c >b/drivers/iio/pressure/mpl3115.c >index cc3f84139157..525644a7442d 100644 >--- a/drivers/iio/pressure/mpl3115.c >+++ b/drivers/iio/pressure/mpl3115.c >@@ -190,7 +190,7 @@ static const struct iio_chan_spec >mpl3115_channels[] = { > { > .type = IIO_PRESSURE, > .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), >- BIT(IIO_CHAN_INFO_SCALE), >+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), > .scan_index = 0, > .scan_type = { > .sign = 'u', >@@ -203,7 +203,7 @@ static const struct iio_chan_spec >mpl3115_channels[] = { > { > .type = IIO_TEMP, > .info_mask_separate = BIT(IIO_CHAN_INFO_RAW), >- BIT(IIO_CHAN_INFO_SCALE), >+ .info_mask_shared_by_type = BIT(IIO_CHAN_INFO_SCALE), > .scan_index = 1, > .scan_type = { > .sign = 's', -- Sent from my Android device with K-9 Mail. Please excuse my brevity. ^ permalink raw reply [flat|nested] 9+ messages in thread
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2017-01-31 18:19 ` kernel 4.10-rcx iio helper question Ken.Lin
2017-01-31 21:04 ` Daniel Baluta
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[not found] ` <03B5A3CA1724CE4EAC32B27E39292A677FC7512DF4@AUSMAIL1.AUS.ADVANTECH.CORP>
2017-01-31 21:18 ` Ken.Lin
2017-01-31 22:01 ` Jonathan Cameron
2017-01-31 21:06 ` Jonathan Cameron
[not found] ` <273c851c-4623-652e-097b-5a3827205ebc@axentia.se>
[not found] ` <WM!c988294410704f5fdb6034485f95e283ba8a11561dded8460b8f9f4c302e8d9d3b5dfd6fbd89ee21c83838f1af88f482!@dg.advantech.com>
[not found] ` <03B5A3CA1724CE4EAC32B27E39292A677FC7512E85@AUSMAIL1.AUS.ADVANTECH.CORP>
2017-02-01 0:42 ` Ken.Lin
2017-02-01 6:50 ` Jonathan Cameron
2017-02-01 8:03 ` Daniel Baluta
[not found] ` <28916f18-da40-cf0a-5bfa-2c8d53a7d83c@axentia.se>
2017-02-01 17:25 ` Jonathan Cameron
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