Re: [PATCH] scsi: bsg: Fix device unregistration

From: Jens Axboe
Date: Thu Sep 09 2021 - 16:42:16 EST

On 9/9/21 2:40 PM, Jens Axboe wrote:
> On 9/8/21 9:46 PM, Zenghui Yu wrote:
>> We use device_initialize() to take refcount for the device but forget to
>> put_device() on device teardown, which ends up leaking private data of the
>> driver core, dev_name(), etc. This is reported by kmemleak at boot time if
>> we compile kernel with DEBUG_TEST_DRIVER_REMOVE.
>> Note that adding the missing put_device() is _not_ sufficient to fix device
>> unregistration. As we don't provide the .release() method for device, which
>> turned out to be typically wrong and will be complained loudly by the
>> driver core.
>> Fix both of them.
> Applied, thanks.

Actually, let's move this through the SCSI tree, as the offending patch
went that way (and my branches are behind that point).

Jens Axboe