linux-kernel - Re: [PATCH] virtio-blk: modify the value type of num in virtio_queue

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Date:   Wed, 17 Nov 2021 10:20:14 +0100
From:   Stefano Garzarella <sgarzare@...hat.com>
To:     cgel.zte@...il.com
Cc:     mst@...hat.com, jasowang@...hat.com, pbonzini@...hat.com,
        stefanha@...hat.com, axboe@...nel.dk,
        virtualization@...ts.linux-foundation.org,
        linux-block@...r.kernel.org, linux-kernel@...r.kernel.org,
        Ye Guojin <ye.guojin@....com.cn>,
        Zeal Robot <zealci@....com.cn>
Subject: Re: [PATCH] virtio-blk: modify the value type of num in
 virtio_queue_rq()

On Wed, Nov 17, 2021 at 06:39:55AM +0000, cgel.zte@...il.com wrote:
>From: Ye Guojin <ye.guojin@....com.cn>
>
>This was found by coccicheck:
>./drivers/block/virtio_blk.c, 334, 14-17, WARNING Unsigned expression
>compared with zero  num < 0
>

We should add the Fixes tag:

Fixes: 02746e26c39e ("virtio-blk: avoid preallocating big SGL for data")

>Reported-by: Zeal Robot <zealci@....com.cn>
>Signed-off-by: Ye Guojin <ye.guojin@....com.cn>
>---
> drivers/block/virtio_blk.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
>diff --git a/drivers/block/virtio_blk.c b/drivers/block/virtio_blk.c
>index 97bf051a50ce..eed1666eff31 100644
>--- a/drivers/block/virtio_blk.c
>+++ b/drivers/block/virtio_blk.c
>@@ -316,7 +316,7 @@ static blk_status_t virtio_queue_rq(struct 
>blk_mq_hw_ctx *hctx,
> 	struct request *req = bd->rq;
> 	struct virtblk_req *vbr = blk_mq_rq_to_pdu(req);
> 	unsigned long flags;
>-	unsigned int num;
>+	int num;
> 	int qid = hctx->queue_num;
> 	bool notify = false;
> 	blk_status_t status;
>-- 
>2.25.1
>

The patch LGTM.

With the Fixes tag added:

Reviewed-by: Stefano Garzarella <sgarzare@...hat.com>