linux-kernel - Re: [PATCH v3 14/23] scsi: hisi_sas: add v3 cq interrupt handler

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Date:   Thu, 8 Jun 2017 00:34:00 -0700
From:   Christoph Hellwig <hch@...radead.org>
To:     John Garry <john.garry@...wei.com>
Cc:     Christoph Hellwig <hch@...radead.org>, jejb@...ux.vnet.ibm.com,
        martin.petersen@...cle.com, john.garry2@...l.dcu.ie,
        linuxarm@...wei.com, linux-scsi@...r.kernel.org,
        linux-kernel@...r.kernel.org, arnd@...db.de,
        Xiang Chen <chenxiang66@...ilicon.com>
Subject: Re: [PATCH v3 14/23] scsi: hisi_sas: add v3 cq interrupt handler

Hi John,

sorry for dropping the ball, but your repost reminded me.

On Thu, Jun 01, 2017 at 11:36:55AM +0100, John Garry wrote:
> In the command completion code we need to check for abnormal completion due
> to underflow, but ignore it when it occurs in some commands, like inquiry.
> This is why we check for rw command - it is equivalent to !inquiry.
> 
> I'll see if we can change the check to explicitly ignore certain commands
> which complete abnormally with underflow.

In general it should be up to the higher level and not the driver
to detect underflow, and that's how most (hopefully all, but I won't
bet on some older ones) of our drivers operate.

> 
> > What about 32-byte CDs or things like Write Same?
> > 
> 
> You're talking about VARIABLE_LENGTH_CMD (opcode 0x7f) for 32-byte CDs,
> right?

Yes.