linux-kernel - RE: [PATCH] scsi: ufs: Check that space was properly alloced in copy_query

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Date:   Mon, 3 Jun 2019 08:37:42 +0000
From:   Avri Altman <Avri.Altman@....com>
To:     Alim Akhtar <alim.akhtar@...sung.com>,
        "James E.J. Bottomley" <jejb@...ux.vnet.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        Evan Green <evgreen@...omium.org>,
        Bean Huo <beanhuo@...ron.com>,
        Pedro Sousa <pedrom.sousa@...opsys.com>
CC:     Avi Shchislowski <Avi.Shchislowski@....com>,
        Alex Lemberg <Alex.Lemberg@....com>
Subject: RE: [PATCH] scsi: ufs: Check that space was properly alloced in
 copy_query_response

Hi Alim,
Thank you for your review.
Sorry for the late response - I was away for a couple of weeks.

Thanks,
Avri

> Subject: Re: [PATCH] scsi: ufs: Check that space was properly alloced in
> copy_query_response
> 
> Hi Avri
> 
> On 5/21/19 1:54 PM, Avri Altman wrote:
> > struct ufs_dev_cmd is the main container that supports device management
> > commands. In the case of a read descriptor request, we assume that the
> > proper space was allocated in dev_cmd to hold the returning descriptor.
> >
> > This is no longer true, as there are flows that doesn't use dev_cmd
> > for device management requests, and was wrong in the first place.
> >
> Can you please put some light on those flows? Are those platform
> specific? Just curious.
No, actually its quite simplistic.
__ufshcd_query_descriptor set dev_cmd.query.descriptor 
to point to its designated space before sending the read descriptor query,
and to null once it's done.
But it doesn't check it in ufshcd_copy_query_response when the query
returns from the device, which it should, as I indicated in the commit log.


> This change looks ok to me. I hope you have tested this patch.
Yes I did.

> Reviewed-by: Alim Akhtar <alim.akhtar@...sung.com>