From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Message-Id: <20130911042855.771423486@goodmis.org> Date: Wed, 11 Sep 2013 00:27:29 -0400 From: Steven Rostedt To: linux-kernel@vger.kernel.org, stable@vger.kernel.org Cc: Mahesh Rajashekhara , James Bottomley Subject: [022/251] aacraid: Fix for arrays are going offline in the system. System hangs References: <20130911042707.738353451@goodmis.org> Content-Disposition: inline; filename=0022-aacraid-Fix-for-arrays-are-going-offline-in-the-syst.patch Sender: linux-kernel-owner@vger.kernel.org List-ID: 3.6.11.9-rc1 stable review patch. If anyone has any objections, please let me know. ------------------ From: Mahesh Rajashekhara [ Upstream commit c5bebd829dd95602c15f8da8cc50fa938b5e0254 ] 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 Cc: Signed-off-by: James Bottomley Signed-off-by: Steven Rostedt --- 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); -- 1.7.10.4