Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S933716Ab3D3T7J (ORCPT ); Tue, 30 Apr 2013 15:59:09 -0400 Received: from e9.ny.us.ibm.com ([32.97.182.139]:46168 "EHLO e9.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932735Ab3D3T7H (ORCPT ); Tue, 30 Apr 2013 15:59:07 -0400 Date: Tue, 30 Apr 2013 14:58:43 -0500 From: "Philip J. Kelleher" To: axboe@kernel.dk Cc: linux-kernel@vger.kernel.org, klebers@linux.vnet.ibm.com, brking@linux.vnet.ibm.com Subject: [PATCH 7/9] rsxx: Adding EEH check inside cregs timeout. Message-ID: <20130430195843.GB15133@oc6784271780.ibm.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline User-Agent: Mutt/1.5.20 (2009-12-10) X-TM-AS-MML: No X-Content-Scanned: Fidelis XPS MAILER x-cbid: 13043019-7182-0000-0000-000006797A30 Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 1544 Lines: 37 From: Philip J Kelleher Unfortunaly, our CPU register path does not do any kind of EEH error checking. So to fix this issue, an ioread32 was added to the CPU register timeout code. This way, the driver can check to see if the timeout was caused by an EEH error or not. Signed-off-by: Philip J Kelleher ------------------------------------------------------------------------------- diff -uprN -X linux-block-vanilla/Documentation/dontdiff linux-block-vanilla/drivers/block/rsxx/cregs.c linux-block/drivers/block/rsxx/cregs.c --- linux-block-vanilla/drivers/block/rsxx/cregs.c 2013-04-29 13:57:13.412383865 -0500 +++ linux-block/drivers/block/rsxx/cregs.c 2013-04-29 15:51:32.164188612 -0500 @@ -431,6 +431,15 @@ static int __issue_creg_rw(struct rsxx_c *hw_stat = completion.creg_status; if (completion.st) { + /* + * This read is needed to verify that there has not been any + * extreme errors that might have occurred, i.e. EEH. The + * function iowrite32 will not detect EEH errors, so it is + * necessary that we recover if such an error is the reason + * for the timeout. + */ + ioread32(card->regmap + SCRATCH); + dev_warn(CARD_TO_DEV(card), "creg command failed(%d x%08x)\n", completion.st, addr); -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/