3.5.7.17 -stable review patch. If anyone has any objections, please let me know.
------------------ From: Mahesh Rajashekhara <[email protected]> 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 <[email protected]> Signed-off-by: James Bottomley <[email protected]> [ luis: backported to 3.5: adjusted context ] Signed-off-by: Luis Henriques <[email protected]> --- 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 7628206..4de2612 100644 --- a/drivers/scsi/aacraid/src.c +++ b/drivers/scsi/aacraid/src.c @@ -101,6 +101,9 @@ static irqreturn_t aac_src_intr_message(int irq, void *dev_id) struct list_head *entry; int send_it = 0; + src_writel(dev, MUnit.ODR_C, bellbits); + src_readl(dev, MUnit.ODR_C); + if (dev->sync_fib) { our_interrupt = 1; if (dev->sync_fib->callback) -- 1.8.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
