linux-kernel - Re: [PATCH 1/1] [RFC] blk-mq: fix queue stalling on shared hctx restart

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Message-ID: <1510070074.2656.2.camel@wdc.com>
Date:   Tue, 7 Nov 2017 15:54:35 +0000
From:   Bart Van Assche <Bart.VanAssche@....com>
To:     "roman.penyaev@...fitbricks.com" <roman.penyaev@...fitbricks.com>
CC:     Bart Van Assche <Bart.VanAssche@....com>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "linux-block@...r.kernel.org" <linux-block@...r.kernel.org>,
        "hare@...e.com" <hare@...e.com>, "axboe@...com" <axboe@...com>,
        "hch@....de" <hch@....de>
Subject: Re: [PATCH 1/1] [RFC] blk-mq: fix queue stalling on shared hctx
 restart

On Wed, 2017-10-18 at 12:22 +0200, Roman Pen wrote:
> the patch below fixes queue stalling when shared hctx marked for restart
> (BLK_MQ_S_SCHED_RESTART bit) but q->shared_hctx_restart stays zero.

Since I have been able to reproduce this queue stall with an upstream driver
(ib_srp) and since I also have been able to verify that this patch fixes that
stall:

Reviewed-by: Bart Van Assche <bart.vanassche@....com>
Tested-by: Bart Van Assche <bart.vanassche@....com>