From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753027AbYKQHZk (ORCPT ); Mon, 17 Nov 2008 02:25:40 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1753415AbYKQHVJ (ORCPT ); Mon, 17 Nov 2008 02:21:09 -0500 Received: from kroah.org ([198.145.64.141]:38291 "EHLO coco.kroah.org" rhost-flags-OK-OK-OK-FAIL) by vger.kernel.org with ESMTP id S1752606AbYKQHU7 (ORCPT ); Mon, 17 Nov 2008 02:20:59 -0500 Date: Sun, 16 Nov 2008 23:14:57 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , Willy Tarreau , Rodrigo Rubira Branco , Jake Edge , Eugene Teo , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, Alan Jenkins , Alexey Starikovskiy , Len Brown , "Rafael J. Wysocki" , Greg Kroah-Hartman Subject: [patch 12/46] ACPI: EC: make kernel messages more useful when GPE storm is detected Message-ID: <20081117071457.GM29522@kroah.com> References: <20081117070621.430169021@blue.kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename="acpi-ec-make-kernel-messages-more-useful-when-gpe-storm-is-detected.patch" In-Reply-To: <20081117071333.GA29522@kroah.com> User-Agent: Mutt/1.5.16 (2007-06-09) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org 2.6.27-stable review patch. If anyone has any objections, please let us know. ------------------ From: Alan Jenkins commit f8248434e6a11d7cd314281be3b39bbcf82fc243 upstream. Make sure we can tell if the GPE storm workaround gets activated, and avoid flooding the logs afterwards. http://bugzilla.kernel.org/show_bug.cgi?id=11841 "plenty of line "ACPI: EC: non-query interrupt received, switching to interrupt mode" in dmesg" Signed-off-by: Alan Jenkins Acked-by: Alexey Starikovskiy Signed-off-by: Len Brown Cc: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/acpi/ec.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) --- a/drivers/acpi/ec.c +++ b/drivers/acpi/ec.c @@ -286,7 +286,8 @@ static int acpi_ec_transaction_unlocked( acpi_enable_gpe(NULL, ec->gpe, ACPI_NOT_ISR); } else if (test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && t->irq_count > ACPI_EC_STORM_THRESHOLD) { - pr_debug(PREFIX "GPE storm detected\n"); + pr_info(PREFIX "GPE storm detected, " + "transactions will use polling mode\n"); set_bit(EC_FLAGS_GPE_STORM, &ec->flags); } return ret; @@ -566,9 +567,15 @@ static u32 acpi_ec_gpe_handler(void *dat if (!test_bit(EC_FLAGS_GPE_MODE, &ec->flags) && !test_bit(EC_FLAGS_NO_GPE, &ec->flags)) { /* this is non-query, must be confirmation */ - if (printk_ratelimit()) - pr_info(PREFIX "non-query interrupt received," + if (!test_bit(EC_FLAGS_GPE_STORM, &ec->flags)) { + if (printk_ratelimit()) + pr_info(PREFIX "non-query interrupt received," + " switching to interrupt mode\n"); + } else { + /* hush, STORM switches the mode every transaction */ + pr_debug(PREFIX "non-query interrupt received," " switching to interrupt mode\n"); + } set_bit(EC_FLAGS_GPE_MODE, &ec->flags); } return ACPI_INTERRUPT_HANDLED; --