linux-kernel - Re: [PATCH] scsi: bsg: Fix device unregistration

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Date:   Thu, 9 Sep 2021 07:36:05 +0200
From:   Greg KH <gregkh@...uxfoundation.org>
To:     Zenghui Yu <yuzenghui@...wei.com>
Cc:     linux-scsi@...r.kernel.org, linux-block@...r.kernel.org,
        linux-kernel@...r.kernel.org, fujita.tomonori@....ntt.co.jp,
        axboe@...nel.dk, martin.petersen@...cle.com, hch@....de,
        wanghaibin.wang@...wei.com
Subject: Re: [PATCH] scsi: bsg: Fix device unregistration

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@...wei.com>
> ---
>  block/bsg.c | 13 +++++++++++--
>  1 file changed, 11 insertions(+), 2 deletions(-)

Reviewed-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>