3.5.7.17 -stable review patch. If anyone has any objections, please let me know.
------------------
From: Mahesh Rajashekhara <Mahesh.Rajashekhara@xxxxxxxx>
commit c5bebd829dd95602c15f8da8cc50fa938b5e0254 upstream.
One of the customer had reported that the set of raid logical arrays will
become unavailable (I/O offline) after a long hours of IO stress test. The OS
wouldn`t be accessible afterwards and require a hard reset.
This driver patch has a fix for race condition between the doorbell and the
circular buffer. The driver is modified to do an extra read after clearing the
doorbell in case there had been a completion posted during the small timing
window.
With this fix, we ran IO stress for ~13 days. There were no IO failures.
Signed-off-by: Mahesh Rajashekhara <Mahesh.Rajashekhara@xxxxxxxx>
Signed-off-by: James Bottomley <JBottomley@xxxxxxxxxxxxx>
[ luis: backported to 3.5: adjusted context ]
Signed-off-by: Luis Henriques <luis.henriques@xxxxxxxxxxxxx>
---
drivers/scsi/aacraid/src.c | 3 +++
1 file changed, 3 insertions(+)
diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index 7628206..4de2612 100644
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -101,6 +101,9 @@ static irqreturn_t aac_src_intr_message(int irq, void *dev_id)
struct list_head *entry;
int send_it = 0;
+ src_writel(dev, MUnit.ODR_C, bellbits);
+ src_readl(dev, MUnit.ODR_C);
+
if (dev->sync_fib) {
our_interrupt = 1;
if (dev->sync_fib->callback)
--
1.8.1.2
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