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Commit c5bebd82 authored by Mahesh Rajashekhara's avatar Mahesh Rajashekhara Committed by James Bottomley
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[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: default avatarMahesh Rajashekhara <Mahesh.Rajashekhara@pmcs.com>
Cc: <stable@vger.kernel.org>
Signed-off-by: default avatarJames Bottomley <JBottomley@Parallels.com>
parent ed7bd661

drivers/scsi/aacraid/src.c

+3 −0
Original line number Diff line number Diff line
@@ -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);