linux-kernel - Re: [PATCH] scsi: qla2xxx: Re-use existing error handling path

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Message-ID: <f237fbd4-2ebf-0105-2a1a-93672cd446cb@acm.org>
Date:   Sun, 11 Apr 2021 08:58:52 -0700
From:   Bart Van Assche <bvanassche@....org>
To:     Christophe JAILLET <christophe.jaillet@...adoo.fr>,
        njavali@...vell.com, GR-QLogic-Storage-Upstream@...vell.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org
Subject: Re: [PATCH] scsi: qla2xxx: Re-use existing error handling path

On 4/11/21 2:21 AM, Christophe JAILLET wrote:
> The code above this hunk looks spurious to me.
> 
> It looks like an error handling path (i.e.
> "if (response_len > bsg_job->reply_payload.payload_len)")
> but returns 0, which is the initial value of 'ret'.
> 
> Shouldn't we have ret = -<something> here?

Hmm ... if I read that code path correctly it is on purpose that that
code path returns 0 and error reporting happens by reporting the
EXT_STATUS_BUFFER_TOO_SMALL error code to user space.

> ---
>  drivers/scsi/qla2xxx/qla_bsg.c | 4 ++--
>  1 file changed, 2 insertions(+), 2 deletions(-)
> 
> diff --git a/drivers/scsi/qla2xxx/qla_bsg.c b/drivers/scsi/qla2xxx/qla_bsg.c
> index aef2f7cc89d3..d42b2ad84049 100644
> --- a/drivers/scsi/qla2xxx/qla_bsg.c
> +++ b/drivers/scsi/qla2xxx/qla_bsg.c
> @@ -2585,8 +2585,8 @@ qla2x00_get_host_stats(struct bsg_job *bsg_job)
>  
>  	data = kzalloc(response_len, GFP_KERNEL);
>  	if (!data) {
> -		kfree(req_data);
> -		return -ENOMEM;
> +		ret = -ENOMEM;
> +		goto host_stat_out;
>  	}
>  
>  	ret = qla2xxx_get_ini_stats(fc_bsg_to_shost(bsg_job), req_data->stat_type,

Since the above looks good to me:

Reviewed-by: Bart Van Assche <bvanassche@....org>