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

From: Greg KH
Date: Thu Sep 09 2021 - 01:36:36 EST

On Thu, Sep 09, 2021 at 11:46:08AM +0800, 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.
> Fixes: ead09dd3aed5 ("scsi: bsg: Simplify device registration")
> Signed-off-by: Zenghui Yu <yuzenghui@xxxxxxxxxx>
> ---
> block/bsg.c | 13 +++++++++++--
> 1 file changed, 11 insertions(+), 2 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>