Re: [PATCH] clk: Mark fwnodes when their clock provider is added

[Saravana Kannan <saravanak@google.com>]

On Tue, Apr 20, 2021 at 8:27 PM Guenter Roeck <linux@roeck-us.net> wrote:
>
> Hi,
>
> On Wed, Feb 10, 2021 at 01:44:35PM +0200, Tudor Ambarus wrote:
> > This is a follow-up for:
> > commit 3c9ea42802a1 ("clk: Mark fwnodes when their clock provider is added/removed")
> >
> > The above commit updated the deprecated of_clk_add_provider(),
> > but missed to update the preferred of_clk_add_hw_provider().
> > Update it now.
> >
> > Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
>
> This patch still causes a crash when booting a raspi2 image in linux-next.

Stephen,

Can we please just pick any one of the proposed fixes? This bug has
been unfixed for so long!

-Saravana

>
> [   21.456500] Unable to handle kernel NULL pointer dereference at virtual address 00000028
> [   21.456750] pgd = (ptrval)
> [   21.456927] [00000028] *pgd=00000000
> [   21.457567] Internal error: Oops: 5 [#1] SMP ARM
> [   21.457882] Modules linked in:
> [   21.458077] CPU: 0 PID: 77 Comm: kworker/u8:10 Not tainted 5.12.0-rc8-next-20210420 #1
> [   21.458291] Hardware name: BCM2835
> [   21.458525] Workqueue: events_unbound deferred_probe_work_func
> [   21.458997] PC is at of_clk_add_hw_provider+0xbc/0xe8
> [   21.459176] LR is at of_clk_add_hw_provider+0xa8/0xe8
> ...
> [   21.477603] [<c0a32aec>] (of_clk_add_hw_provider) from [<c0a32b60>] (devm_of_clk_add_hw_provider+0x48/0x80)
> [   21.477861] [<c0a32b60>] (devm_of_clk_add_hw_provider) from [<c0a471e4>] (raspberrypi_clk_probe+0x260/0x388)
> [   21.478087] [<c0a471e4>] (raspberrypi_clk_probe) from [<c0c1c4d0>] (platform_probe+0x5c/0xb8)
> [   21.478287] [<c0c1c4d0>] (platform_probe) from [<c0c19d84>] (really_probe+0xf0/0x39c)
> [   21.478471] [<c0c19d84>] (really_probe) from [<c0c1a098>] (driver_probe_device+0x68/0xc0)
> [   21.478659] [<c0c1a098>] (driver_probe_device) from [<c0c17f54>] (bus_for_each_drv+0x84/0xc8)
> [   21.478860] [<c0c17f54>] (bus_for_each_drv) from [<c0c19c20>] (__device_attach+0xec/0x158)
> [   21.479050] [<c0c19c20>] (__device_attach) from [<c0c18de8>] (bus_probe_device+0x88/0x90)
> [   21.479236] [<c0c18de8>] (bus_probe_device) from [<c0c16a68>] (device_add+0x398/0x8ac)
> [   21.479421] [<c0c16a68>] (device_add) from [<c0c1c1b4>] (platform_device_add+0xf0/0x200)
> [   21.479607] [<c0c1c1b4>] (platform_device_add) from [<c0c1ccc0>] (platform_device_register_full+0xd0/0x110)
> [   21.479836] [<c0c1ccc0>] (platform_device_register_full) from [<c104c130>] (rpi_firmware_probe+0x1a4/0x20c)
> [   21.480061] [<c104c130>] (rpi_firmware_probe) from [<c0c1c4d0>] (platform_probe+0x5c/0xb8)
> [   21.480255] [<c0c1c4d0>] (platform_probe) from [<c0c19d84>] (really_probe+0xf0/0x39c)
> [   21.480437] [<c0c19d84>] (really_probe) from [<c0c1a098>] (driver_probe_device+0x68/0xc0)
> [   21.480626] [<c0c1a098>] (driver_probe_device) from [<c0c17f54>] (bus_for_each_drv+0x84/0xc8)
> [   21.480829] [<c0c17f54>] (bus_for_each_drv) from [<c0c19c20>] (__device_attach+0xec/0x158)
> [   21.481018] [<c0c19c20>] (__device_attach) from [<c0c18de8>] (bus_probe_device+0x88/0x90)
> [   21.481205] [<c0c18de8>] (bus_probe_device) from [<c0c192bc>] (deferred_probe_work_func+0x8c/0xbc)
> [   21.481413] [<c0c192bc>] (deferred_probe_work_func) from [<c036802c>] (process_one_work+0x268/0x798)
> [   21.481624] [<c036802c>] (process_one_work) from [<c0368774>] (worker_thread+0x218/0x4f4)
> [   21.481822] [<c0368774>] (worker_thread) from [<c0370f28>] (kthread+0x140/0x174)
> [   21.481999] [<c0370f28>] (kthread) from [<c030017c>] (ret_from_fork+0x14/0x38)
> [   21.482185] Exception stack(0xc42b7fb0 to 0xc42b7ff8)
>
> Updated bisect log is attached.
>
> Guenter
>
> ---
> # bad: [50b8b1d699ac313c0a07a3c185ffb23aecab8abb] Add linux-next specific files for 20210419
> # good: [bf05bf16c76bb44ab5156223e1e58e26dfe30a88] Linux 5.12-rc8
> git bisect start 'HEAD' 'v5.12-rc8'
> # good: [c4bb91fc07e59241cde97f913d7a2fbedc248f0d] Merge remote-tracking branch 'crypto/master'
> git bisect good c4bb91fc07e59241cde97f913d7a2fbedc248f0d
> # good: [f15bbf170b40b48a43ed7076ce9f8ac9380e5752] Merge remote-tracking branch 'edac/edac-for-next'
> git bisect good f15bbf170b40b48a43ed7076ce9f8ac9380e5752
> # bad: [550a78090dcc4061e191312a757a127f0b6e6323] Merge remote-tracking branch 'vfio/next'
> git bisect bad 550a78090dcc4061e191312a757a127f0b6e6323
> # bad: [9f074d2a7bf49b2c9e1609703757b18de7611aef] Merge remote-tracking branch 'usb/usb-next'
> git bisect bad 9f074d2a7bf49b2c9e1609703757b18de7611aef
> # good: [855b2fdb7c543c94e7623e6ad0b492f04a5317db] Merge remote-tracking branch 'percpu/for-next'
> git bisect good 855b2fdb7c543c94e7623e6ad0b492f04a5317db
> # good: [1d08ed588c6a85a35a24c82eb4cf0807ec2b366a] usbip: vudc: fix missing unlock on error in usbip_sockfd_store()
> git bisect good 1d08ed588c6a85a35a24c82eb4cf0807ec2b366a
> # good: [1b7ce8fab5fd0c406dbf165b12d44b301decf589] Merge remote-tracking branch 'ipmi/for-next'
> git bisect good 1b7ce8fab5fd0c406dbf165b12d44b301decf589
> # good: [fe8e488058c47e9a8a2c85321f7198a0a17b0131] dt-bindings: usb: mtk-xhci: add wakeup interrupt
> git bisect good fe8e488058c47e9a8a2c85321f7198a0a17b0131
> # bad: [3c652132ce9052e626bf509932fcacfebed1ccb4] platform-msi: fix kernel-doc warnings
> git bisect bad 3c652132ce9052e626bf509932fcacfebed1ccb4
> # bad: [7f2fac70b729d68a34e5eba8d1fb68eb69b05169] device property: Add test cases for fwnode_property_count_*() APIs
> git bisect bad 7f2fac70b729d68a34e5eba8d1fb68eb69b05169
> # good: [38f087de8947700d3b06d3d1594490e0f611c5d1] devtmpfs: fix placement of complete() call
> git bisect good 38f087de8947700d3b06d3d1594490e0f611c5d1
> # good: [b6f617df4fa936c1ab1831c2b23563f6c1add6c4] driver core: Update device link status properly for device_bind_driver()
> git bisect good b6f617df4fa936c1ab1831c2b23563f6c1add6c4
> # bad: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added
> git bisect bad 6579c8d97ad7fc5671ee60234f3b8388abee5f77
> # good: [ea718c699055c8566eb64432388a04974c43b2ea] Revert "Revert "driver core: Set fw_devlink=on by default""
> git bisect good ea718c699055c8566eb64432388a04974c43b2ea
> # first bad commit: [6579c8d97ad7fc5671ee60234f3b8388abee5f77] clk: Mark fwnodes when their clock provider is added