linux-kernel - Re: [PATCH] scsi: pm8001: Drop !task check in pm8001_abort

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Message-ID: <23b7b1f7-94c1-9c01-e1c8-c0a30a4aa06d@opensource.wdc.com>
Date:   Thu, 27 Oct 2022 09:30:52 +0900
From:   Damien Le Moal <damien.lemoal@...nsource.wdc.com>
To:     John Garry <john.garry@...wei.com>, jinpu.wang@...ud.ionos.com,
        jejb@...ux.ibm.com, martin.petersen@...cle.com
Cc:     linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] scsi: pm8001: Drop !task check in pm8001_abort_task()

On 10/26/22 19:56, John Garry wrote:
> In commit 0b639decf651 ("scsi: pm8001: Modify task abort handling for SATA
> task"), code was introduced to dereference "task" pointer in
> pm8001_abort_task(). However there was a pre-existing later check for
> "!task", which spooked the kernel test robot.
> 
> Function pm8001_abort_task() should never be passed NULL for "task"
> pointer, so remove that check. Also remove the "unlikely" hint, as this is
> not fastpath code.
> 
> Reported-by: kernel test robot <lkp@...el.com>
> Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
> Signed-off-by: John Garry <john.garry@...wei.com>
> 
> diff --git a/drivers/scsi/pm8001/pm8001_sas.c b/drivers/scsi/pm8001/pm8001_sas.c
> index 2359e827c9e6..e5673c774f66 100644
> --- a/drivers/scsi/pm8001/pm8001_sas.c
> +++ b/drivers/scsi/pm8001/pm8001_sas.c
> @@ -979,7 +979,7 @@ int pm8001_abort_task(struct sas_task *task)
>  	u32 phy_id, port_id;
>  	struct sas_task_slow slow_task;
>  
> -	if (unlikely(!task || !task->lldd_task || !task->dev))
> +	if (!task->lldd_task || !task->dev)
>  		return TMF_RESP_FUNC_FAILED;
>  
>  	dev = task->dev;

Reviewed-by: Damien Le Moal <damien.lemoal@...nsource.wdc.com>

-- 
Damien Le Moal
Western Digital Research