From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1754199AbYHAUDJ (ORCPT ); Fri, 1 Aug 2008 16:03:09 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758676AbYHAUCl (ORCPT ); Fri, 1 Aug 2008 16:02:41 -0400 Received: from e3.ny.us.ibm.com ([32.97.182.143]:54907 "EHLO e3.ny.us.ibm.com" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1758579AbYHAUCk (ORCPT ); Fri, 1 Aug 2008 16:02:40 -0400 Subject: [PATCH 2/2] Cell OProfile: SPU mutex lock fix, version 4 From: Carl Love To: Arnd Bergmann , linuxppc-dev@ozlabs.org, cel , cbe-oss-dev@ozlabs.org, linux-kernel Content-Type: text/plain Date: Fri, 01 Aug 2008 13:01:19 -0700 Message-Id: <1217620879.15667.145.camel@carll-linux-desktop> Mime-Version: 1.0 X-Mailer: Evolution 2.12.1 Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org If an error occurs on opcontrol start, the event and per cpu buffers are released. If later opcontrol shutdown is called then the free function will be called again to free buffers that no longer exist. This results in a kernel oops. The following changes prevent the call to delete buffers that don't exist. Signed-off-by: Carl Love Index: Cell_kernel_6_26_2008/drivers/oprofile/cpu_buffer.c =================================================================== --- Cell_kernel_6_26_2008.orig/drivers/oprofile/cpu_buffer.c +++ Cell_kernel_6_26_2008/drivers/oprofile/cpu_buffer.c @@ -38,8 +38,12 @@ void free_cpu_buffers(void) { int i; - for_each_online_cpu(i) - vfree(per_cpu(cpu_buffer, i).buffer); + for_each_online_cpu(i) { + if (per_cpu(cpu_buffer, i).buffer) { + vfree(per_cpu(cpu_buffer, i).buffer); + per_cpu(cpu_buffer, i).buffer = NULL; + } + } } unsigned long oprofile_get_cpu_buffer_size(void) Index: Cell_kernel_6_26_2008/drivers/oprofile/event_buffer.c =================================================================== --- Cell_kernel_6_26_2008.orig/drivers/oprofile/event_buffer.c +++ Cell_kernel_6_26_2008/drivers/oprofile/event_buffer.c @@ -92,7 +92,10 @@ out: void free_event_buffer(void) { - vfree(event_buffer); + if (event_buffer) + vfree(event_buffer); + + event_buffer = NULL; }