[PATCH] sata_mv: grab host lock inside eng_timeout

Bug fix:  mv_eng_timeout() calls mv_err_intr() without first grabbing the host lock,
which can lead to all sorts of interesting scenarios.

This whole error-handling portion of sata_mv is nasty (and will get fixed for
the new EH stuff), but for now this patch will help keep it on life-support.

Signed-off-by:  Mark Lord <liml@rtr.ca>
Signed-off-by: Jeff Garzik <jeff@garzik.org>

1 files changed, 3 insertions, 0 deletions

diff --git a/drivers/scsi/sata_mv.c b/drivers/scsi/sata_mv.c
index 9b8bca1ac1f0..f16f92a6ec0f 100644
--- a/drivers/scsi/sata_mv.c
+++ b/drivers/scsi/sata_mv.c
@@ -2035,6 +2035,7 @@ static void mv_phy_reset(struct ata_port *ap)
 static void mv_eng_timeout(struct ata_port *ap)
 {
         struct ata_queued_cmd *qc;
+        unsigned long flags;
 
         printk(KERN_ERR "ata%u: Entering mv_eng_timeout\n",ap->id);
         DPRINTK("All regs @ start of eng_timeout\n");
@@ -2046,8 +2047,10 @@ static void mv_eng_timeout(struct ata_port *ap)
                ap->host_set->mmio_base, ap, qc, qc->scsicmd,
                &qc->scsicmd->cmnd);
 
+        spin_lock_irqsave(&ap->host_set->lock, flags);
         mv_err_intr(ap, 0);
         mv_stop_and_reset(ap);
+        spin_unlock_irqrestore(&ap->host_set->lock, flags);
 
         WARN_ON(!(qc->flags & ATA_QCFLAG_ACTIVE));
         if (qc->flags & ATA_QCFLAG_ACTIVE) {