linux-kernel - [PATCH 3.16 057/158] scsi_transport_srp: Fix fast_io_fail_tmo=dev_loss

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Message-Id: <20140915192544.605701395@linuxfoundation.org>
Date:	Mon, 15 Sep 2014 12:24:56 -0700
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Bart Van Assche <bvanassche@....org>,
	Sagi Grimberg <sagig@...lanox.com>,
	David Dillow <dave@...dillows.org>,
	Roland Dreier <roland@...estorage.com>
Subject: [PATCH 3.16 057/158] scsi_transport_srp: Fix fast_io_fail_tmo=dev_loss_tmo=off behavior

3.16-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Bart Van Assche <bvanassche@....org>

commit cd53eb686d2418eda938aad3c9da42b7dfa9351f upstream.

If scsi_remove_host() is called while an rport is in the blocked state
then scsi_remove_host() will only finish if the rport is unblocked
from inside a timer function. Make sure that an rport only enters the
blocked state if a timer will be started that will unblock it. This
avoids that unloading the ib_srp kernel module after having
disconnected the initiator from the target system results in a
deadlock if both the fast_io_fail_tmo and dev_loss_tmo parameters have
been set to "off".

Signed-off-by: Bart Van Assche <bvanassche@....org>
Reviewed-by: Sagi Grimberg <sagig@...lanox.com>
Reviewed-by: David Dillow <dave@...dillows.org>
Signed-off-by: Roland Dreier <roland@...estorage.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/scsi/scsi_transport_srp.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/scsi/scsi_transport_srp.c
+++ b/drivers/scsi/scsi_transport_srp.c
@@ -473,7 +473,8 @@ static void __srp_start_tl_fail_timers(s
 	if (delay > 0)
 		queue_delayed_work(system_long_wq, &rport->reconnect_work,
 				   1UL * delay * HZ);
-	if (srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) {
+	if ((fast_io_fail_tmo >= 0 || dev_loss_tmo >= 0) &&
+	    srp_rport_set_state(rport, SRP_RPORT_BLOCKED) == 0) {
 		pr_debug("%s new state: %d\n", dev_name(&shost->shost_gendev),
 			 rport->state);
 		scsi_target_block(&shost->shost_gendev);


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