linux-kernel - Re: [PATCH] scsi: core: Add BLIST_NO_ASK_VPD

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Date:   Thu, 29 Sep 2022 12:42:24 +0200
From:   Martin Wilck <mwilck@...e.com>
To:     Lee Duncan <leeman.duncan@...il.com>,
        "James E.J. Bottomley" <jejb@...ux.ibm.com>,
        "Martin K. Petersen" <martin.petersen@...cle.com>,
        linux-scsi@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Lee Duncan <lduncan@...e.com>, Hannes Reinecke <hare@...e.de>
Subject: Re: [PATCH] scsi: core: Add BLIST_NO_ASK_VPD_SIZE for some VDASD

On Wed, 2022-09-28 at 11:13 -0700, Lee Duncan wrote:
> From: Lee Duncan <lduncan@...e.com>
> 
> Some storage, such as AIX VDASD (virtual storage) and IBM 2076
> (front end) do not like the recent commit:
> 
> commit c92a6b5d6335 ("scsi: core: Query VPD size before getting full
> page")
> 
> That commit changed getting SCSI VPD pages so that we now read
> just enough of the page to get the actual page size, then read
> the whole page in a second read. The problem is that the above
> mentioned hardware returns zero for the page size, because of
> a firmware error. In such cases, until the firmware is fixed,
> this new black flag says to revert to the original method of
> reading the VPD pages, i.e. try to read as a whole buffer's
> worth on the first try.
> 
> Fixes: c92a6b5d6335 ("scsi: core: Query VPD size before getting full
> page")
> Reported-by: Martin Wilck <mwilck@...e.com>
> Suggested-by: Hannes Reinecke <hare@...e.de>
> Signed-off-by: Lee Duncan <lduncan@...e.com>

Reviewed-by: Martin Wilck <mwilck@...e.com>