From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1752623Ab1GUSQI (ORCPT ); Thu, 21 Jul 2011 14:16:08 -0400 Received: from g1t0026.austin.hp.com ([15.216.28.33]:10760 "EHLO g1t0026.austin.hp.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1752953Ab1GUSQE (ORCPT ); Thu, 21 Jul 2011 14:16:04 -0400 Subject: [PATCH] cciss: do not attempt to read from a write-only register To: axboe@kernel.dk From: "Stephen M. Cameron" Cc: stephenmcameron@gmail.com, akpm@linux-foundation.org, mikem@beardog.cce.hp.com, linux-kernel@vger.kernel.org, thenzl@redhat.com Date: Thu, 21 Jul 2011 13:16:01 -0500 Message-ID: <20110721181601.31646.18252.stgit@beardog.cce.hp.com> User-Agent: StGit/0.15 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org From: Stephen M. Cameron Most smartarrays will tolerate it, but some new ones don't. Without this change some newer Smart Arrays will lock up and i/o will grind to a halt. Signed-off-by: Stephen M. Cameron --- drivers/block/cciss.h | 2 +- 1 files changed, 1 insertions(+), 1 deletions(-) diff --git a/drivers/block/cciss.h b/drivers/block/cciss.h index 16b4d58..c049548 100644 --- a/drivers/block/cciss.h +++ b/drivers/block/cciss.h @@ -223,7 +223,7 @@ static void SA5_submit_command( ctlr_info_t *h, CommandList_struct *c) h->ctlr, c->busaddr); #endif /* CCISS_DEBUG */ writel(c->busaddr, h->vaddr + SA5_REQUEST_PORT_OFFSET); - readl(h->vaddr + SA5_REQUEST_PORT_OFFSET); + readl(h->vaddr + SA5_SCRATCHPAD_OFFSET); h->commands_outstanding++; if ( h->commands_outstanding > h->max_outstanding) h->max_outstanding = h->commands_outstanding;