From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1755444Ab1CUXPs (ORCPT ); Mon, 21 Mar 2011 19:15:48 -0400 Received: from kroah.org ([198.145.64.141]:49338 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1755292Ab1CUXP0 (ORCPT ); Mon, 21 Mar 2011 19:15:26 -0400 X-Mailbox-Line: From gregkh@clark.kroah.org Mon Mar 21 16:07:12 2011 Message-Id: <20110321230712.047034457@clark.kroah.org> User-Agent: quilt/0.48-16.4 Date: Mon, 21 Mar 2011 16:06:27 -0700 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: stable-review@kernel.org, torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Tejun Heo , Jeff Garzik Subject: [28/87] libata: fix hotplug for drivers which dont implement LPM In-Reply-To: <20110321230732.GA26510@kroah.com> Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.37-stable review patch. If anyone has any objections, please let us know. ------------------ From: Tejun Heo commit eb0e85e36b971ec31610eda7e3ff5c11c1c44785 upstream. ata_eh_analyze_serror() suppresses hotplug notifications if LPM is being used because LPM generates spurious hotplug events. It compared whether link->lpm_policy was different from ATA_LPM_MAX_POWER to determine whether LPM is enabled; however, this is incorrect as for drivers which don't implement LPM, lpm_policy is always ATA_LPM_UNKNOWN. This disabled hotplug detection for all drivers which don't implement LPM. Fix it by comparing whether lpm_policy is greater than ATA_LPM_MAX_POWER. Signed-off-by: Tejun Heo Signed-off-by: Jeff Garzik Signed-off-by: Greg Kroah-Hartman --- drivers/ata/libata-eh.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/drivers/ata/libata-eh.c +++ b/drivers/ata/libata-eh.c @@ -1618,7 +1618,7 @@ static void ata_eh_analyze_serror(struct * host links. For disabled PMP links, only N bit is * considered as X bit is left at 1 for link plugging. */ - if (link->lpm_policy != ATA_LPM_MAX_POWER) + if (link->lpm_policy > ATA_LPM_MAX_POWER) hotplug_mask = 0; /* hotplug doesn't work w/ LPM */ else if (!(link->flags & ATA_LFLAG_DISABLED) || ata_is_host_link(link)) hotplug_mask = SERR_PHYRDY_CHG | SERR_DEV_XCHG;