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

[Bart Van Assche <Bart.VanAssche@wdc.com>]

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.