linux-kernel - Re: [PATCH RESEND 2/2] scsi/ufs: Fix evaluation of task

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Message-Id: <20120418155643.5b6eff01.akpm@linux-foundation.org>
Date:	Wed, 18 Apr 2012 15:56:43 -0700
From:	Andrew Morton <akpm@...ux-foundation.org>
To:	Venkatraman S <svenkatr@...com>
Cc:	<linux-kernel@...r.kernel.org>, <santoshsy@...il.com>,
	<linkinjeon@...il.com>,
	James Bottomley <James.Bottomley@...senPartnership.com>,
	linux-scsi@...r.kernel.org
Subject: Re: [PATCH RESEND 2/2] scsi/ufs: Fix evaluation of task_failed
 status


Please cc James and linux-scsi on drivers/scsi patches?

On Wed, 18 Apr 2012 13:08:53 +0530
Venkatraman S <svenkatr@...com> wrote:

> Else FAILED would be set even if task_result was
> originally equal to UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED.

This changelog is inadequate.  It failed to describe the end-user
impact of the bug.  Without this information we cannot decide which
kernel version(s) should be patched.  Please always fully describe a
bug when fixing it.

> --- a/drivers/scsi/ufs/ufshcd.c
> +++ b/drivers/scsi/ufs/ufshcd.c
> @@ -1160,7 +1160,7 @@ static int ufshcd_task_req_compl(struct ufs_hba *hba, u32 index)
>  		task_result = be32_to_cpu(task_rsp_upiup->header.dword_1);
>  		task_result = ((task_result & MASK_TASK_RESPONSE) >> 8);
>  
> -		if (task_result != UPIU_TASK_MANAGEMENT_FUNC_COMPL ||
> +		if (task_result != UPIU_TASK_MANAGEMENT_FUNC_COMPL &&
>  		    task_result != UPIU_TASK_MANAGEMENT_FUNC_SUCCEEDED)
>  			task_result = FAILED;
>  	} else {

And the title of the patch is poor.  There is no "task_failed" here. 
Something like "fix evaluation of task completion code" would be
better?
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