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From: Tom Yan <>
Subject: Re: [Regression][Stable] sd use scsi_mode_sense with invalid param
Date: Sat, 27 Nov 2021 05:21:33 +0800	[thread overview]
Message-ID: <> (raw)
In-Reply-To: <>

Ahh, looks like the required change to sd
(c749301ebee82eb5e97dec14b6ab31a4aabe37a6) has been added to upstream
but somehow got missed when 17b49bcbf8351d3dbe57204468ac34f033ed60bc
was pulled into stable...

On Sat, 27 Nov 2021 at 05:11, Tom Yan <> wrote:
> Hi,
> So with 17b49bcbf8351d3dbe57204468ac34f033ed60bc (upstream),
> scsi_mode_sense now returns -EINVAL if len < 8, yet in sd, the first mode
> sense attempted by sd_read_cache_type() is done with (first_)len being
> 4, which results in the failure of the attempt.
> Since the commit is merged into stable, my SATA drive (that has
> volatile write cache) is assumed to be a "write through" drive after I
> upgraded from 5.15.4 to 5.15.5, as libata sets use_10_for_ms to 1.
> Since sd does not (get to) determine which mode sense command to use,
> should scsi_mode_sense at least accept a special value 0 (which
> first_len would be set to), which is use to refers to the minimum len
> to use for mode sense 6 and 10 respectively (i.e. 4 or 8)?
> Regards,
> Tom

  reply	other threads:[~2021-11-26 21:24 UTC|newest]

Thread overview: 5+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-26 21:11 [Regression][Stable] sd use scsi_mode_sense with invalid param Tom Yan
2021-11-26 21:21 ` Tom Yan [this message]
2021-11-26 21:33   ` Tom Yan
2021-11-27  1:15     ` Damien Le Moal
2021-11-27 11:55       ` Greg KH

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