libata: fix EH locking
Wrap ata_qc_complete() calls in EH context in spinlocks, to prevent
races (mainly in ATAPI code paths).
diff --git a/drivers/scsi/sata_sx4.c b/drivers/scsi/sata_sx4.c
index e2db499..a20d428 100644
--- a/drivers/scsi/sata_sx4.c
+++ b/drivers/scsi/sata_sx4.c
@@ -848,10 +848,14 @@
static void pdc_eng_timeout(struct ata_port *ap)
{
u8 drv_stat;
+ struct ata_host_set *host_set = ap->host_set;
struct ata_queued_cmd *qc;
+ unsigned long flags;
DPRINTK("ENTER\n");
+ spin_lock_irqsave(&host_set->lock, flags);
+
qc = ata_qc_from_tag(ap, ap->active_tag);
if (!qc) {
printk(KERN_ERR "ata%u: BUG: timeout without command\n",
@@ -885,6 +889,7 @@
}
out:
+ spin_unlock_irqrestore(&host_set->lock, flags);
DPRINTK("EXIT\n");
}