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List: linux-scsi
Subject: Re: [PATCH] scsi: fix scsi_host_queue_ready
From: Guenter Roeck <linux () roeck-us ! net>
Date: 2018-06-30 1:40:12
Message-ID: 20180630014012.GA10966 () roeck-us ! net
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On Sat, Jun 30, 2018 at 09:27:24AM +0800, Ming Lei wrote:
> 328728630d9f2bf1 ("scsi: avoid to hold host-wide counter of host_busy
> for scsi_mq") adds one extra check on scsi_host_busy(shost) in
> scsi_host_queue_ready(), which is wrong and not necessary, can causes
> booting stall on LSI53c895A.
>
> So remove the check.
>
> Cc: Omar Sandoval <osandov@fb.com>,
> Cc: "Martin K. Petersen" <martin.petersen@oracle.com>,
> Cc: James Bottomley <james.bottomley@hansenpartnership.com>,
> Cc: Christoph Hellwig <hch@lst.de>,
> Cc: Don Brace <don.brace@microsemi.com>
> Cc: Kashyap Desai <kashyap.desai@broadcom.com>
> Cc: Mike Snitzer <snitzer@redhat.com>
> Cc: Hannes Reinecke <hare@suse.de>
> Cc: Laurence Oberman <loberman@redhat.com>
> Cc: Bart Van Assche <bart.vanassche@wdc.com>
> Cc: Guenter Roeck <linux@roeck-us.net>
> Reported-by: Guenter Roeck <linux@roeck-us.net>
> Fixes: 328728630d9f2bf1 ("scsi: avoid to hold host-wide counter of host_busy for scsi_mq")
> Signed-off-by: Ming Lei <ming.lei@redhat.com>
Tested-by: Guenter Roeck <linux@roeck-us.net>
> ---
> drivers/scsi/scsi_lib.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/scsi/scsi_lib.c b/drivers/scsi/scsi_lib.c
> index 1c79c86184b1..cc97818cb29c 100644
> --- a/drivers/scsi/scsi_lib.c
> +++ b/drivers/scsi/scsi_lib.c
> @@ -1561,7 +1561,7 @@ static inline int scsi_host_queue_ready(struct request_queue *q,
> else
> busy = 0;
> if (atomic_read(&shost->host_blocked) > 0) {
> - if (busy || scsi_host_busy(shost))
> + if (busy)
> goto starved;
>
> /*
> --
> 2.9.5
>
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