linux-kernel - Re: [PATCH v2] sd: Ignore sync cache failures when not supported

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Date:   Thu, 4 May 2017 15:19:31 +0000
From:   Bart Van Assche <Bart.VanAssche@...disk.com>
To:     "thierry.escande@...labora.com" <thierry.escande@...labora.com>,
        "jejb@...ux.vnet.ibm.com" <jejb@...ux.vnet.ibm.com>,
        "martin.petersen@...cle.com" <martin.petersen@...cle.com>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v2] sd: Ignore sync cache failures when not supported

On Thu, 2017-05-04 at 11:43 +0200, Thierry Escande wrote:
> From: Derek Basehore <dbasehore@...omium.org>
> 
> Some external hard drives don't support the sync command even though the
> hard drive has write cache enabled. In this case, upon suspend request,
> sync cache failures are ignored if the error code in the sense header is
> ILLEGAL_REQUEST. There's not much we can do for these drives, so we
> shouldn't fail to suspend for this error case. The drive may stay
> powered if that's the setup for the port it's plugged into.

Reviewed-by: Bart van Assche <bart.vanassche@...disk.com>