From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932709AbYBGAOX (ORCPT ); Wed, 6 Feb 2008 19:14:23 -0500 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932179AbYBFX6I (ORCPT ); Wed, 6 Feb 2008 18:58:08 -0500 Received: from ns1.suse.de ([195.135.220.2]:46198 "EHLO mx1.suse.de" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S932144AbYBFX6G (ORCPT ); Wed, 6 Feb 2008 18:58:06 -0500 Date: Wed, 6 Feb 2008 15:53:21 -0800 From: Greg KH To: linux-kernel@vger.kernel.org, stable@kernel.org, Greg KH Cc: Justin Forbes , Zwane Mwaikambo , "Theodore Ts'o" , Randy Dunlap , Dave Jones , Chuck Wolber , Chris Wedgwood , Michael Krufky , Chuck Ebbert , Domenico Andreoli , torvalds@linux-foundation.org, akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk, "Rafael J. Wysocki" Subject: [patch 41/73] Freezer: Fix APM emulation breakage Message-ID: <20080206235321.GP13121@suse.de> References: <20080206234302.769849277@mini.kroah.org> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline; filename="freezer-fix-apm-emulation-breakage.patch" In-Reply-To: <20080206235015.GA13121@suse.de> 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 2.6.23-stable review patch. If anyone has any objections, please let us know. ------------------ From: Rafael J. Wysocki The APM emulation is currently broken as a result of commit 831441862956fffa17b9801db37e6ea1650b0f69 "Freezer: make kernel threads nonfreezable by default" that removed the PF_NOFREEZE annotations from apm_ioctl() without adding the appropriate freezer hooks. Fix it and remove the unnecessary variable flags from apm_ioctl(). This problem has been fixed in the mainline by commit cb43c54ca05c01533c45e4d3abfe8f99b7acf624 "Freezer: Fix APM emulation breakage". Signed-off-by: Rafael J. Wysocki Signed-off-by: Greg Kroah-Hartman --- drivers/char/apm-emulation.c | 15 ++++++++------- include/linux/freezer.h | 23 +++++++++++++++++++++++ 2 files changed, 31 insertions(+), 7 deletions(-) --- a/drivers/char/apm-emulation.c +++ b/drivers/char/apm-emulation.c @@ -295,7 +295,6 @@ static int apm_ioctl(struct inode * inode, struct file *filp, u_int cmd, u_long arg) { struct apm_user *as = filp->private_data; - unsigned long flags; int err = -EINVAL; if (!as->suser || !as->writer) @@ -331,10 +330,16 @@ apm_ioctl(struct inode * inode, struct f * Wait for the suspend/resume to complete. If there * are pending acknowledges, we wait here for them. */ - flags = current->flags; + freezer_do_not_count(); wait_event(apm_suspend_waitqueue, as->suspend_state == SUSPEND_DONE); + + /* + * Since we are waiting until the suspend is done, the + * try_to_freeze() in freezer_count() will not trigger + */ + freezer_count(); } else { as->suspend_state = SUSPEND_WAIT; mutex_unlock(&state_lock); @@ -362,14 +367,10 @@ apm_ioctl(struct inode * inode, struct f * Wait for the suspend/resume to complete. If there * are pending acknowledges, we wait here for them. */ - flags = current->flags; - - wait_event_interruptible(apm_suspend_waitqueue, + wait_event_freezable(apm_suspend_waitqueue, as->suspend_state == SUSPEND_DONE); } - current->flags = flags; - mutex_lock(&state_lock); err = as->suspend_result; as->suspend_state = SUSPEND_NONE; --- a/include/linux/freezer.h +++ b/include/linux/freezer.h @@ -4,6 +4,7 @@ #define FREEZER_H_INCLUDED #include +#include #ifdef CONFIG_PM_SLEEP /* @@ -126,6 +127,24 @@ static inline void set_freezable(void) current->flags &= ~PF_NOFREEZE; } +/* + * Freezer-friendly wrapper around wait_event_interruptible(), originally + * defined in + */ + +#define wait_event_freezable(wq, condition) \ +({ \ + int __retval; \ + do { \ + __retval = wait_event_interruptible(wq, \ + (condition) || freezing(current)); \ + if (__retval && !freezing(current)) \ + break; \ + else if (!(condition)) \ + __retval = -ERESTARTSYS; \ + } while (try_to_freeze()); \ + __retval; \ +}) #else /* !CONFIG_PM_SLEEP */ static inline int frozen(struct task_struct *p) { return 0; } static inline int freezing(struct task_struct *p) { return 0; } @@ -143,6 +162,10 @@ static inline void freezer_do_not_count( static inline void freezer_count(void) {} static inline int freezer_should_skip(struct task_struct *p) { return 0; } static inline void set_freezable(void) {} + +#define wait_event_freezable(wq, condition) \ + wait_event_interruptible(wq, condition) + #endif /* !CONFIG_PM_SLEEP */ #endif /* FREEZER_H_INCLUDED */ --