[PATCH] sil24: ignore non-error exception irqs

01_sil24_ignore-non-error-exception-irqs.patch

	Do not error-finish commands for non-error exception irqs -
	just ignore them.  This is taken from Edward's driver.

Signed-off-by: Tejun Heo <htejun@gmail.com>

 sata_sil24.c |   11 ++++++++++-
 1 file changed, 10 insertions(+), 1 deletion(-)
Signed-off-by: Jeff Garzik <jgarzik@pobox.com>

1 files changed, 10 insertions, 1 deletions

diff --git a/drivers/scsi/sata_sil24.c b/drivers/scsi/sata_sil24.c
index d8a2f5f04e8..571302dc48a 100644
--- a/drivers/scsi/sata_sil24.c
+++ b/drivers/scsi/sata_sil24.c
@@ -489,12 +489,21 @@ static void sil24_error_intr(struct ata_port *ap, u32 slot_stat)
         u32 irq_stat, cmd_err, sstatus, serror;
 
         irq_stat = readl(port + PORT_IRQ_STAT);
+        writel(irq_stat, port + PORT_IRQ_STAT);         /* clear irq */
+
+        if (!(irq_stat & PORT_IRQ_ERROR)) {
+                /* ignore non-completion, non-error irqs for now */
+                printk(KERN_WARNING DRV_NAME
+                       "ata%u: non-error exception irq (irq_stat %x)\n",
+                       ap->id, irq_stat);
+                return;
+        }
+
         cmd_err = readl(port + PORT_CMD_ERR);
         sstatus = readl(port + PORT_SSTATUS);
         serror = readl(port + PORT_SERROR);
 
         /* Clear IRQ/errors */
-        writel(irq_stat, port + PORT_IRQ_STAT);
         if (cmd_err)
                 writel(cmd_err, port + PORT_CMD_ERR);
         if (serror)