linux-kernel - Re: [GIT PULL] SCSI fixes for 4.13-rc6

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Date:   Wed, 23 Aug 2017 15:02:42 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "torvalds@...ux-foundation.org" <torvalds@...ux-foundation.org>,
        "James.Bottomley@...senPartnership.com" 
        <James.Bottomley@...senPartnership.com>,
        "akpm@...ux-foundation.org" <akpm@...ux-foundation.org>
CC:     "linux-scsi@...r.kernel.org" <linux-scsi@...r.kernel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [GIT PULL] SCSI fixes for 4.13-rc6

On Wed, 2017-08-23 at 07:42 +0100, James Bottomley wrote:
> Six minor and error leg fixes, plus one major change: the reversion of
> scsi-mq as the default.  We're doing the latter temporarily (with a
> backport to stable) to give us time to fix all the issues that turned
> up with this default before trying again.
> [ ... ]
> Damien Le Moal (1):
>       scsi: sd_zbc: Write unlock zone from sd_uninit_cmnd()
> [ ... ]

Hello James,

Had you noticed that Damien had asked not to send the "sd_zbc: Write unlock
zone from sd_uninit_cmnd()" patch to Linus without my "scsi-mq: Always
unprepare before requeuing a request" patch? A quote from an e-mail from
Damien (https://www.spinics.net/lists/stable/msg185436.html):

---------------------------------------------------------------------------
Re: [PATCH] Revert "scsi-mq: Always unprepare before requeuing a request"
>> For an unknown reason this patch causes the boot process to hang on
>> PowerPC systems:
> 
> OK, dropped it from fixes for now.

It means that commit 70e42fd02c46e2aa9ab07b766d418637e3a51de7 "scsi:
sd_zbc: Write unlock zone from sd_uninit_cmnd()" will need to be
reverted too as it will not solve the potential deadlock anymore. Bart's
patch was needed for it to work.
---------------------------------------------------------------------------

Bart.