linux-kernel - Re: [PATCH] xen-blkback: Remove needless request

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Date:   Fri, 10 Sep 2021 02:37:33 +0000
From:   Damien Le Moal <Damien.LeMoal@....com>
To:     Xu Wang <vulab@...as.ac.cn>,
        "konrad.wilk@...cle.com" <konrad.wilk@...cle.com>,
        "roger.pau@...rix.com" <roger.pau@...rix.com>,
        "axboe@...nel.dk" <axboe@...nel.dk>,
        "xen-devel@...ts.xenproject.org" <xen-devel@...ts.xenproject.org>
CC:     "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] xen-blkback: Remove needless request_queue NULL pointer
 check

On 2021/09/10 11:32, Xu Wang wrote:
> The request_queue pointer returned from bdev_get_queue() shall
> never be NULL, so the null check is unnecessary, just remove it.
> 
> Signed-off-by: Xu Wang <vulab@...as.ac.cn>
> ---
>  drivers/block/xen-blkback/xenbus.c | 2 +-
>  1 file changed, 1 insertion(+), 1 deletion(-)
> 
> diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
> index 33eba3df4dd9..f05132b9ddbf 100644
> --- a/drivers/block/xen-blkback/xenbus.c
> +++ b/drivers/block/xen-blkback/xenbus.c
> @@ -516,7 +516,7 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
>  		vbd->type |= VDISK_REMOVABLE;
>  
>  	q = bdev_get_queue(bdev);
> -	if (q && test_bit(QUEUE_FLAG_WC, &q->queue_flags))
> +	if test_bit(QUEUE_FLAG_WC, &q->queue_flags)

Missing parenthesis. Did you even compile this ?


>  		vbd->flush_support = true;
>  
>  	if (q && blk_queue_secure_erase(q))

And why not change this one too ?

> 


-- 
Damien Le Moal
Western Digital Research