[SCSI] libsas: fix runaway error handler problem

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.

Cc: stable@kernel.org
Signed-off-by: James Bottomley <James.Bottomley@suse.de>

diff --git a/drivers/scsi/libsas/sas_scsi_host.c b/drivers/scsi/libsas/sas_scsi_host.c
index 5815cbeb27a6a6caa5397b202f18d3ad015e0879..9a7aaf5f1311069893aa59dc384c1a3dfd613f82 100644 (file)
--- a/drivers/scsi/libsas/sas_scsi_host.c
+++ b/drivers/scsi/libsas/sas_scsi_host.c
@@ -646,6 +646,7 @@ void sas_scsi_recover_host(struct Scsi_Host *shost)
 
        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__);