linux-kernel - [070/272] [SCSI] libsas: fix runaway error handler problem

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Message-Id: <20110216001432.134760660@clark.kroah.org>
Date:	Tue, 15 Feb 2011 16:12:07 -0800
From:	Greg KH <gregkh@...e.de>
To:	linux-kernel@...r.kernel.org, stable@...nel.org
Cc:	stable-review@...nel.org, torvalds@...ux-foundation.org,
	akpm@...ux-foundation.org, alan@...rguk.ukuu.org.uk,
	James Bottomley <James.Bottomley@...e.de>
Subject: [070/272] [SCSI] libsas: fix runaway error handler problem

2.6.37-stable review patch.  If anyone has any objections, please let us know.

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

From: James Bottomley <James.Bottomley@...e.de>

commit 9ee91f7fb550a4c82f82d9818e42493484c754af upstream.

libsas makes use of scsi_schedule_eh() but forgets to clear the
host_eh_scheduled flag in its error handling routine.  Because of this,
the error handler thread never gets to sleep; it's constantly awake and
trying to run the error routine leading to console spew and inability to
run anything else (at least on a UP system).  The fix is to clear the
flag as we splice the work queue.

Signed-off-by: James Bottomley <James.Bottomley@...e.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@...e.de>

---
 drivers/scsi/libsas/sas_scsi_host.c |    1 +
 1 file changed, 1 insertion(+)

--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -647,6 +647,7 @@ void sas_scsi_recover_host(struct Scsi_H
 
 	spin_lock_irqsave(shost->host_lock, flags);
 	list_splice_init(&shost->eh_cmd_q, &eh_work_q);
+	shost->host_eh_scheduled = 0;
 	spin_unlock_irqrestore(shost->host_lock, flags);
 
 	SAS_DPRINTK("Enter %s\n", __func__);


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