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| author | Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com> | 2013-06-18 17:02:07 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-07-25 14:07:30 -0700 |
| commit | 4e6b18250651a14b053508e30e731247e28e3f2a (patch) | |
| tree | f793ca546f5be2f0a32392af1eeb565e964d4609 /drivers/scsi | |
| parent | 98dcc2946adbe4349ef1ef9b99873b912831edd4 (diff) | |
| download | lwn-4e6b18250651a14b053508e30e731247e28e3f2a.tar.gz lwn-4e6b18250651a14b053508e30e731247e28e3f2a.zip | |
SCSI: aacraid: Fix for arrays are going offline in the system. System hangs
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@pmcs.com>
Signed-off-by: James Bottomley <JBottomley@Parallels.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/scsi')
| -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); |