linux-kernel - Re: [PATCH v2] scsi: xen-scsifront: add error handling for xenbus

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Date:   Thu, 14 Jun 2018 17:54:44 -0400
From:   Boris Ostrovsky <boris.ostrovsky@...cle.com>
To:     Zhouyang Jia <jiazhouyang09@...il.com>
Cc:     Juergen Gross <jgross@...e.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        xen-devel@...ts.xenproject.org, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH v2] scsi: xen-scsifront: add error handling for
 xenbus_printf

On 06/14/2018 12:08 PM, Zhouyang Jia wrote:
> When xenbus_printf fails, the lack of error-handling code may
> cause unexpected results.
>
> This patch adds error-handling code after calling xenbus_printf.
>
> Signed-off-by: Zhouyang Jia <jiazhouyang09@...il.com>
> ---
> v1->v2:
> - Fix dereferencing before checking
> ---
>  drivers/scsi/xen-scsifront.c | 29 ++++++++++++++++++++++-------
>  1 file changed, 22 insertions(+), 7 deletions(-)
>
> diff --git a/drivers/scsi/xen-scsifront.c b/drivers/scsi/xen-scsifront.c
> index 36f59a1..a7f6111 100644
> --- a/drivers/scsi/xen-scsifront.c
> +++ b/drivers/scsi/xen-scsifront.c
> @@ -654,10 +654,16 @@ static int scsifront_dev_reset_handler(struct scsi_cmnd *sc)
>  static int scsifront_sdev_configure(struct scsi_device *sdev)
>  {
>  	struct vscsifrnt_info *info = shost_priv(sdev->host);
> +	int err;
>  
> -	if (info && current == info->curr)
> -		xenbus_printf(XBT_NIL, info->dev->nodename,
> +	if (info && current == info->curr) {
> +		err = xenbus_printf(XBT_NIL, info->dev->nodename,
>  			      info->dev_state_path, "%d", XenbusStateConnected);
> +		if (err) {
> +			dev_err(&info->dev->dev, "writing dev_state_path\n");

These errors should be reported using xenbus_dev_error().

And the second patch too.

-boris