Re: [PATCH 0/5] mfd: Fix platform device ids to avoid probe failure

[Bartlomiej Zolnierkiewicz]

Hi,

Please get v2 instead (with corrected 'stable' mailing list address on cc:).

Sorry for the noise.

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics

On Friday, March 20, 2015 08:02:02 PM Bartlomiej Zolnierkiewicz wrote:
> Hi,
> 
> Commit 6e3f62f0793e ("mfd: core: Fix platform-device id generation")
> changed the way platform device ids are generated from mfd id base and
> cell ids in mfd_add_device().  Unfortunately the change in question
> breaks mfd drivers which are using mfd_add_devices() with mfd id base
> equal to -1 and non-zero cell ids (used to distinguish cells with
> the same name field).  The result is that mfd core tries to register
> platform devices with the same name which obviously fails and leads
> to mfd device probe failure.
> 
> Relevant error messages (in this case for MAX8997 PMIC driver):
> 
> [    0.911674] ------------[ cut here ]------------
> [    0.911706] WARNING: CPU: 0 PID: 1 at fs/sysfs/dir.c:31 sysfs_warn_dup+0x54/0x70()
> [    0.911718] sysfs: cannot create duplicate filename '/devices/13860000.i2c/i2c-0/0-0066/max8997-led'
> ...
> [    0.912382] ------------[ cut here ]------------
> [    0.912402] WARNING: CPU: 0 PID: 1 at lib/kobject.c:240 kobject_add_internal+0x238/0x2c0()
> [    0.912411] kobject_add_internal failed for max8997-led with -EEXIST, don't try to register things with the same name in th
> ...
> [    0.920721] max8997 0-0066: failed to add MFD devices -17
> [    0.921553] max8997: probe of 0-0066 failed with error -17
> 
> Changing mfd_add_devices() mfd id base from -1 to 0 and at the same
> time setting proper cell ids for all cells fixes the issue.
> 
> MAX8997 PMIC fix was tested on Exynos4210 Origen board, the rest of
> patches is compile tested only.
> 
> Best regards,
> --
> Bartlomiej Zolnierkiewicz
> Samsung R&D Institute Poland
> Samsung Electronics
> 
> 
> Bartlomiej Zolnierkiewicz (5):
>   mfd: max8997: Fix platform device ids to avoid probe failure
>   mfd: da9055: Fix platform device ids to avoid probe failure
>   mfd: lp8788: Fix platform device ids to avoid probe failure
>   mfd: wm831x: Fix platform device ids to avoid probe failure
>   mfd: da9052: Fix platform device names
> 
>  drivers/mfd/da9052-core.c |  21 ++++--
>  drivers/mfd/da9055-core.c |  21 ++++--
>  drivers/mfd/lp8788.c      |  10 ++-
>  drivers/mfd/max8997.c     |  16 ++--
>  drivers/mfd/wm831x-core.c | 184 +++++++++++++++++++++++++++-------------------
>  5 files changed, 150 insertions(+), 102 deletions(-)

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