diff options
| author | Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com> | 2013-06-18 17:02:07 +0530 |
|---|---|---|
| committer | James Bottomley <JBottomley@Parallels.com> | 2013-06-26 18:01:42 -0700 |
| commit | c5bebd829dd95602c15f8da8cc50fa938b5e0254 (patch) | |
| tree | 1d8bb0abb290d0e8fc4138806a4da39dffae1472 | |
| parent | ed7bd6612e67103f5ee4d8cfffe80cea6df096b9 (diff) | |
| download | linux-c5bebd829dd95602c15f8da8cc50fa938b5e0254.tar.bz2 | |
[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>
| -rw-r--r-- | drivers/scsi/aacraid/src.c | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c index 0f56d8d7524f..7e17107643d4 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); |