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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 /fs/Kconfig
parented7bd6612e67103f5ee4d8cfffe80cea6df096b9 (diff)
downloadblackbird-op-linux-c5bebd829dd95602c15f8da8cc50fa938b5e0254.tar.gz
blackbird-op-linux-c5bebd829dd95602c15f8da8cc50fa938b5e0254.zip
[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>
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