linux-kernel - Re: [PATCH] scsi/atari_scsi: Fix race condition between .queuecommand and EH

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Message-ID: <yq18saro393.fsf@ca-mkp.ca.oracle.com>
Date:   Mon, 23 Nov 2020 22:14:26 -0500
From:   "Martin K. Petersen" <martin.petersen@...cle.com>
To:     Finn Thain <fthain@...egraphics.com.au>
Cc:     Michael Schmitz <schmitzmic@...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
Subject: Re: [PATCH] scsi/atari_scsi: Fix race condition between
 .queuecommand and EH


Finn,

> It is possible that bus_reset_cleanup() or .eh_abort_handler could be
> invoked during NCR5380_queuecommand(). If that takes place before the
> new command is enqueued and after the ST-DMA "lock" has been acquired,
> the ST-DMA "lock" will be released again. This will result in a lost
> DMA interrupt and a command timeout. Fix this by excluding EH and
> interrupt handlers while the new command is enqueued.

Applied to 5.11/scsi-staging, thanks!

-- 
Martin K. Petersen	Oracle Linux Engineering