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    Subject[PATCH 045/145] [SCSI] aacraid: Fix for arrays are going offline in the system. System hangs
    Date
    3.8.13.5 -stable review patch.  If anyone has any objections, please let me know.

    ------------------

    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: Luis Henriques <luis.henriques@canonical.com>
    ---
    drivers/scsi/aacraid/src.c | 3 +++
    1 file changed, 3 insertions(+)

    diff --git a/drivers/scsi/aacraid/src.c b/drivers/scsi/aacraid/src.c
    index 3b021ec..e34418f 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);
    --
    1.8.1.2


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