linux-kernel - Re: [PATCH v2 3/3] scsi: don't add scsi command result bytes

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Message-ID: <20180613115929.GC12438@infradead.org>
Date:   Wed, 13 Jun 2018 04:59:29 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     Johannes Thumshirn <jthumshirn@...e.de>
Cc:     "Martin K . Petersen" <martin.petersen@...cle.com>,
        Linux Kernel Mailinglist <linux-kernel@...r.kernel.org>,
        Linux SCSI Mailinglist <linux-scsi@...r.kernel.org>
Subject: Re: [PATCH v2 3/3] scsi: don't add scsi command result bytes

On Wed, Jun 13, 2018 at 09:53:49AM +0200, Johannes Thumshirn wrote:
> Some drivers are ADDing the scsi command's result bytes instead of
> ORing them.
> 
> While this can produce correct results it has unexpected side effects.
> 
> Signed-off-by: Johannes Thumshirn <jthumshirn@...e.de>

Looks good,

Reviewed-by: Christoph Hellwig <hch@....de>

> -			cmd->result = (DID_OK << 16) + (l & STATUS_MASK);
> +			cmd->result = DID_OK << 16 | (l & STATUS_MASK);

Although I would have keep the braces around the shift operators
to stick closer to the original code.  But the code should be fine
even without them.