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authorMahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>2013-06-18 17:02:07 +0530
committerJames Bottomley <JBottomley@Parallels.com>2013-06-26 18:01:42 -0700
commitc5bebd829dd95602c15f8da8cc50fa938b5e0254 (patch)
tree1d8bb0abb290d0e8fc4138806a4da39dffae1472 /drivers/scsi
parented7bd6612e67103f5ee4d8cfffe80cea6df096b9 (diff)
downloadop-kernel-dev-c5bebd829dd95602c15f8da8cc50fa938b5e0254.zip
op-kernel-dev-c5bebd829dd95602c15f8da8cc50fa938b5e0254.tar.gz
[SCSI] aacraid: Fix for arrays are going offline in the system. System hangs
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@pmcs.com> Cc: <stable@vger.kernel.org> Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Diffstat (limited to 'drivers/scsi')
-rw-r--r--drivers/scsi/aacraid/src.c3
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
index 0f56d8d..7e17107 100644
--- a/drivers/scsi/aacraid/src.c
+++ b/drivers/scsi/aacraid/src.c
@@ -93,6 +93,9 @@ static irqreturn_t aac_src_intr_message(int irq, void *dev_id)
int send_it = 0;
extern int aac_sync_mode;
+ src_writel(dev, MUnit.ODR_C, bellbits);
+ src_readl(dev, MUnit.ODR_C);
+
if (!aac_sync_mode) {
src_writel(dev, MUnit.ODR_C, bellbits);
src_readl(dev, MUnit.ODR_C);
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