Re: [PATCH] scsi: zfcp: remove redundant put_device

From: Heiko Carstens
Date: Thu Sep 06 2018 - 02:24:26 EST


On Thu, Sep 06, 2018 at 02:16:27PM +0800, Ding Xiang wrote:
> device_unregister will put device, do not need to do it one more time
>
> Signed-off-by: Ding Xiang <dingxiang@xxxxxxxxxxxxxxxxxxxx>
> ---
> drivers/s390/scsi/zfcp_unit.c | 2 --
> 1 file changed, 2 deletions(-)
>
> diff --git a/drivers/s390/scsi/zfcp_unit.c b/drivers/s390/scsi/zfcp_unit.c
> index 1bf0a09..6b50084 100644
> --- a/drivers/s390/scsi/zfcp_unit.c
> +++ b/drivers/s390/scsi/zfcp_unit.c
> @@ -249,8 +249,6 @@ int zfcp_unit_remove(struct zfcp_port *port, u64 fcp_lun)
> scsi_device_put(sdev);
> }
>
> - put_device(&unit->dev);
> -
> device_unregister(&unit->dev);
>
> return 0;

I'm quite sure this change is wrong, since the put_device() here seems to
pair with the get_device() in _zfcp_unit_find(). So we would end up with a
memory leak.

Adding Steffen and Benjamin.