[PATCH v3 2/2] drivers/mtd: Fix device registration error

[Aneesh Kumar K.V]

On 2/13/19 6:58 PM, Boris Brezillon wrote:
> Subject prefix should be "mtd: powernv_flash: "
> 
> On Mon, 11 Feb 2019 19:03:38 +0530
> "Aneesh Kumar K.V" <aneesh.kumar at linux.ibm.com> wrote:
> 
>> This change helps me to get multiple mtd device registered. Without this
>> I get
>>
>> sysfs: cannot create duplicate filename '/bus/nvmem/devices/flash0'
>> CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.0.0-rc2-00557-g1ef20ef21f22 #13
>> Call Trace:
>> [c0000000b38e3220] [c000000000b58fe4] dump_stack+0xe8/0x164 (unreliable)
>> [c0000000b38e3270] [c0000000004cf074] sysfs_warn_dup+0x84/0xb0
>> [c0000000b38e32f0] [c0000000004cf6c4] sysfs_do_create_link_sd.isra.0+0x114/0x150
>> [c0000000b38e3340] [c000000000726a84] bus_add_device+0x94/0x1e0
>> [c0000000b38e33c0] [c0000000007218f0] device_add+0x4d0/0x830
>> [c0000000b38e3480] [c0000000009d54a8] nvmem_register.part.2+0x1c8/0xb30
>> [c0000000b38e3560] [c000000000834530] mtd_nvmem_add+0x90/0x120
>> [c0000000b38e3650] [c000000000835bc8] add_mtd_device+0x198/0x4e0
>> [c0000000b38e36f0] [c00000000083619c] mtd_device_parse_register+0x11c/0x280
>> [c0000000b38e3780] [c000000000840830] powernv_flash_probe+0x180/0x250
>> [c0000000b38e3820] [c00000000072c120] platform_drv_probe+0x60/0xf0
>> [c0000000b38e38a0] [c0000000007283c8] really_probe+0x138/0x4d0
>> [c0000000b38e3930] [c000000000728acc] driver_probe_device+0x13c/0x1b0
>> [c0000000b38e39b0] [c000000000728c7c] __driver_attach+0x13c/0x1c0
>> [c0000000b38e3a30] [c000000000725130] bus_for_each_dev+0xa0/0x120
>> [c0000000b38e3a90] [c000000000727b2c] driver_attach+0x2c/0x40
>> [c0000000b38e3ab0] [c0000000007270f8] bus_add_driver+0x228/0x360
>> [c0000000b38e3b40] [c00000000072a2e0] driver_register+0x90/0x1a0
>> [c0000000b38e3bb0] [c00000000072c020] __platform_driver_register+0x50/0x70
>> [c0000000b38e3bd0] [c00000000105c984] powernv_flash_driver_init+0x24/0x38
>> [c0000000b38e3bf0] [c000000000010904] do_one_initcall+0x84/0x464
>> [c0000000b38e3cd0] [c000000001004548] kernel_init_freeable+0x530/0x634
>> [c0000000b38e3db0] [c000000000011154] kernel_init+0x1c/0x168
>> [c0000000b38e3e20] [c00000000000bed4] ret_from_kernel_thread+0x5c/0x68
>> mtd mtd1: Failed to register NVMEM device
>>
>> With the change we now have
>>
>> root@(none):/sys/bus/nvmem/devices# ls -al
>> total 0
>> drwxr-xr-x 2 root root 0 Feb  6 20:49 .
>> drwxr-xr-x 4 root root 0 Feb  6 20:49 ..
>> lrwxrwxrwx 1 root root 0 Feb  6 20:49 flash at 0 -> ../../../devices/platform/ibm,opal:flash at 0/mtd/mtd0/flash at 0
>> lrwxrwxrwx 1 root root 0 Feb  6 20:49 flash at 1 -> ../../../devices/platform/ibm,opal:flash at 1/mtd/mtd1/flash at 1
>>
>> Fixes: acfe63ec1c59 ("mtd: Convert to using %pOFn instead of device_node.name")
> 
> Actually it's not this commit that is at fault as mtd->name was already
> given the value of device_node->name before that. I think you're
> actually fixing 1cbb4a1c433a ("mtd: powernv: Add powernv flash MTD
> abstraction driver").
> 
> No need to send a new version, I can fix that when applying, just let
> me know if you're okay with the changes I suggested.
> 

The suggested changes looks good.

Thanks
-aneesh