| From | Greg Kroah-Hartman <> | Subject | [ 061/103] SCSI: aacraid: Fix for arrays are going offline in the system. System hangs | Date | Tue, 23 Jul 2013 15:26:12 -0700 |
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3.10-stable review patch. If anyone has any objections, please let me know.
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From: Mahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>
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>
--- drivers/scsi/aacraid/src.c | 3 +++ 1 file changed, 3 insertions(+)
--- a/drivers/scsi/aacraid/src.c +++ b/drivers/scsi/aacraid/src.c @@ -93,6 +93,9 @@ static irqreturn_t aac_src_intr_message( 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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