[PATCH] x86, olpc: Indicate that legacy PC platform should not register RTC

[PATCH] x86, olpc: Indicate that legacy PC platform should not register RTC

[Lubomir Rintel]

On OLPC XO-1 we're discovering the RTC via device tree from the arch
initcall. Don't let the PC platform register another one from its
device initcall, it's not going to work:

  sysfs: cannot create duplicate filename '/devices/platform/rtc_cmos'
  CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #12
  Hardware name: OLPC XO/XO, BIOS OLPC Ver 1.00.01 06/11/2014
  Call Trace:
   dump_stack+0x16/0x18
   sysfs_warn_dup+0x46/0x58
   sysfs_create_dir_ns+0x76/0x9b
   kobject_add_internal+0xed/0x209
   ? __schedule+0x3fa/0x447
   kobject_add+0x5b/0x66
   device_add+0x298/0x535
   ? insert_resource_conflict+0x2a/0x3e
   platform_device_add+0x14d/0x192
   ? io_delay_init+0x19/0x19
   platform_device_register+0x1c/0x1f
   add_rtc_cmos+0x16/0x31
   do_one_initcall+0x78/0x14a
   ? do_early_param+0x75/0x75
   kernel_init_freeable+0x152/0x1e0
   ? rest_init+0xa2/0xa2
   kernel_init+0x8/0xd5
   ret_from_fork+0x2e/0x38
  kobject_add_internal failed for rtc_cmos with -EEXIST, don't try to
    register things with the same name in the same directory.
  platform rtc_cmos: registered platform RTC device (no PNP device found)

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
---
 arch/x86/platform/olpc/olpc-xo1-rtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c
index a2b4efddd61a..8e7ddd7e313a 100644
--- a/arch/x86/platform/olpc/olpc-xo1-rtc.c
+++ b/arch/x86/platform/olpc/olpc-xo1-rtc.c
@@ -16,6 +16,7 @@
 
 #include <asm/msr.h>
 #include <asm/olpc.h>
+#include <asm/x86_init.h>
 
 static void rtc_wake_on(struct device *dev)
 {
@@ -75,6 +76,8 @@ static int __init xo1_rtc_init(void)
 	if (r)
 		return r;
 
+	x86_platform.legacy.rtc = 0;
+
 	device_init_wakeup(&xo1_rtc_device.dev, 1);
 	return 0;
 }
-- 
2.19.0

[tip:x86/olpc] x86/olpc: Indicate that legacy PC XO-1 platform should not register RTC

[tip-bot for Lubomir Rintel]

Commit-ID:  d92116b800fb79a72ad26121f5011f6aa3ad94c2
Gitweb:     https://git.kernel.org/tip/d92116b800fb79a72ad26121f5011f6aa3ad94c2
Author:     Lubomir Rintel <lkundrak@v3.sk>
AuthorDate: Thu, 4 Oct 2018 18:08:08 +0200
Committer:  Borislav Petkov <bp@suse.de>
CommitDate: Fri, 5 Oct 2018 12:29:20 +0200

x86/olpc: Indicate that legacy PC XO-1 platform should not register RTC

On OLPC XO-1, the RTC is discovered via device tree from the arch
initcall. Don't let the PC platform register another one from its device
initcall, it's not going to work:

  sysfs: cannot create duplicate filename '/devices/platform/rtc_cmos'
  CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #12
  Hardware name: OLPC XO/XO, BIOS OLPC Ver 1.00.01 06/11/2014
  Call Trace:
   dump_stack+0x16/0x18
   sysfs_warn_dup+0x46/0x58
   sysfs_create_dir_ns+0x76/0x9b
   kobject_add_internal+0xed/0x209
   ? __schedule+0x3fa/0x447
   kobject_add+0x5b/0x66
   device_add+0x298/0x535
   ? insert_resource_conflict+0x2a/0x3e
   platform_device_add+0x14d/0x192
   ? io_delay_init+0x19/0x19
   platform_device_register+0x1c/0x1f
   add_rtc_cmos+0x16/0x31
   do_one_initcall+0x78/0x14a
   ? do_early_param+0x75/0x75
   kernel_init_freeable+0x152/0x1e0
   ? rest_init+0xa2/0xa2
   kernel_init+0x8/0xd5
   ret_from_fork+0x2e/0x38
  kobject_add_internal failed for rtc_cmos with -EEXIST, don't try to
    register things with the same name in the same directory.
  platform rtc_cmos: registered platform RTC device (no PNP device found)

Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>
Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Thomas Gleixner <tglx@linutronix.de>
CC: "H. Peter Anvin" <hpa@zytor.com>
CC: Ingo Molnar <mingo@redhat.com>
CC: x86-ml <x86@kernel.org>
Link: http://lkml.kernel.org/r/20181004160808.307738-1-lkundrak@v3.sk
---
 arch/x86/platform/olpc/olpc-xo1-rtc.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/platform/olpc/olpc-xo1-rtc.c b/arch/x86/platform/olpc/olpc-xo1-rtc.c
index a2b4efddd61a..8e7ddd7e313a 100644
--- a/arch/x86/platform/olpc/olpc-xo1-rtc.c
+++ b/arch/x86/platform/olpc/olpc-xo1-rtc.c
@@ -16,6 +16,7 @@
 
 #include <asm/msr.h>
 #include <asm/olpc.h>
+#include <asm/x86_init.h>
 
 static void rtc_wake_on(struct device *dev)
 {
@@ -75,6 +76,8 @@ static int __init xo1_rtc_init(void)
 	if (r)
 		return r;
 
+	x86_platform.legacy.rtc = 0;
+
 	device_init_wakeup(&xo1_rtc_device.dev, 1);
 	return 0;
 }

[PATCH] x86/olpc: Fix build error with CONFIG_MFD_CS5535=m

[Borislav Petkov]

On Thu, Oct 04, 2018 at 06:08:08PM +0200, Lubomir Rintel wrote:
> On OLPC XO-1 we're discovering the RTC via device tree from the arch
> initcall. Don't let the PC platform register another one from its
> device initcall, it's not going to work:

Btw, a build fix ontop:

---
From: Borislav Petkov <bp@suse.de>
Date: Fri, 5 Oct 2018 15:13:07 +0200

When building a 32-bit config which has the above MFD item as module
but OLPC_XO1_PM is enabled =y - which is bool, btw - the kernel fails
building with:

  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_remove':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:159: undefined reference to `mfd_cell_disable'
  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_probe':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:133: undefined reference to `mfd_cell_enable'
  make: *** [Makefile:1030: vmlinux] Error 1

Force MFD_CS5535 to y if OLPC_XO1_PM is enabled.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Lubomir Rintel <lkundrak@v3.sk>
Cc: x86@kernel.org
---
 arch/x86/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1a0be022f91d..285b5d6a5ea5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2742,8 +2742,7 @@ config OLPC
 
 config OLPC_XO1_PM
 	bool "OLPC XO-1 Power Management"
-	depends on OLPC && MFD_CS5535 && PM_SLEEP
-	select MFD_CORE
+	depends on OLPC && MFD_CS5535=y && PM_SLEEP
 	---help---
 	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
 
-- 
2.19.0.271.gfe8321ec057f

-- 
Regards/Gruss,
    Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

[tip:x86/platform] x86/olpc: Fix build error with CONFIG_MFD_CS5535=m

[tip-bot for Borislav Petkov]

Commit-ID:  fa112cf1e8bc693d5a666b1c479a2859c8b6e0f1
Gitweb:     https://git.kernel.org/tip/fa112cf1e8bc693d5a666b1c479a2859c8b6e0f1
Author:     Borislav Petkov <bp@suse.de>
AuthorDate: Fri, 5 Oct 2018 15:13:07 +0200
Committer:  Borislav Petkov <bp@suse.de>
CommitDate: Sat, 6 Oct 2018 20:40:43 +0200

x86/olpc: Fix build error with CONFIG_MFD_CS5535=m

When building a 32-bit config which has the above MFD item as module
but OLPC_XO1_PM is enabled =y - which is bool, btw - the kernel fails
building with:

  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_remove':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:159: undefined reference to `mfd_cell_disable'
  ld: arch/x86/platform/olpc/olpc-xo1-pm.o: in function `xo1_pm_probe':
  /home/boris/kernel/linux/arch/x86/platform/olpc/olpc-xo1-pm.c:133: undefined reference to `mfd_cell_enable'
  make: *** [Makefile:1030: vmlinux] Error 1

Force MFD_CS5535 to y if OLPC_XO1_PM is enabled.

Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: Lubomir Rintel <lkundrak@v3.sk>
Cc: x86@kernel.org
Link: http://lkml.kernel.org/r/20181005131750.GA5366@zn.tnic
---
 arch/x86/Kconfig | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/arch/x86/Kconfig b/arch/x86/Kconfig
index 1a0be022f91d..285b5d6a5ea5 100644
--- a/arch/x86/Kconfig
+++ b/arch/x86/Kconfig
@@ -2742,8 +2742,7 @@ config OLPC
 
 config OLPC_XO1_PM
 	bool "OLPC XO-1 Power Management"
-	depends on OLPC && MFD_CS5535 && PM_SLEEP
-	select MFD_CORE
+	depends on OLPC && MFD_CS5535=y && PM_SLEEP
 	---help---
 	  Add support for poweroff and suspend of the OLPC XO-1 laptop.
 

Re: [PATCH] x86, olpc: Indicate that legacy PC platform should not register RTC

[Pavel Machek]

[-- Attachment #1: Type: text/plain, Size: 1502 bytes --]

On Thu 2018-10-04 18:08:08, Lubomir Rintel wrote:
> On OLPC XO-1 we're discovering the RTC via device tree from the arch
> initcall. Don't let the PC platform register another one from its
> device initcall, it's not going to work:
> 
>   sysfs: cannot create duplicate filename '/devices/platform/rtc_cmos'
>   CPU: 0 PID: 1 Comm: swapper Not tainted 4.19.0-rc6 #12
>   Hardware name: OLPC XO/XO, BIOS OLPC Ver 1.00.01 06/11/2014
>   Call Trace:
>    dump_stack+0x16/0x18
>    sysfs_warn_dup+0x46/0x58
>    sysfs_create_dir_ns+0x76/0x9b
>    kobject_add_internal+0xed/0x209
>    ? __schedule+0x3fa/0x447
>    kobject_add+0x5b/0x66
>    device_add+0x298/0x535
>    ? insert_resource_conflict+0x2a/0x3e
>    platform_device_add+0x14d/0x192
>    ? io_delay_init+0x19/0x19
>    platform_device_register+0x1c/0x1f
>    add_rtc_cmos+0x16/0x31
>    do_one_initcall+0x78/0x14a
>    ? do_early_param+0x75/0x75
>    kernel_init_freeable+0x152/0x1e0
>    ? rest_init+0xa2/0xa2
>    kernel_init+0x8/0xd5
>    ret_from_fork+0x2e/0x38
>   kobject_add_internal failed for rtc_cmos with -EEXIST, don't try to
>     register things with the same name in the same directory.
>   platform rtc_cmos: registered platform RTC device (no PNP device found)
> 
> Signed-off-by: Lubomir Rintel <lkundrak@v3.sk>

Acked-by: Pavel Machek <pavel@ucw.cz>


-- 
(english) http://www.livejournal.com/~pavelmachek
(cesky, pictures) http://atrey.karlin.mff.cuni.cz/~pavel/picture/horses/blog.html

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