From 3e1d1d28d99dabe63c64f7f40f1ca1d646de1f73 Mon Sep 17 00:00:00 2001 From: Christoph Lameter Date: Fri, 24 Jun 2005 23:13:50 -0700 Subject: [PATCH] Cleanup patch for process freezing 1. Establish a simple API for process freezing defined in linux/include/sched.h: frozen(process) Check for frozen process freezing(process) Check if a process is being frozen freeze(process) Tell a process to freeze (go to refrigerator) thaw_process(process) Restart process frozen_process(process) Process is frozen now 2. Remove all references to PF_FREEZE and PF_FROZEN from all kernel sources except sched.h 3. Fix numerous locations where try_to_freeze is manually done by a driver 4. Remove the argument that is no longer necessary from two function calls. 5. Some whitespace cleanup 6. Clear potential race in refrigerator (provides an open window of PF_FREEZE cleared before setting PF_FROZEN, recalc_sigpending does not check PF_FROZEN). This patch does not address the problem of freeze_processes() violating the rule that a task may only modify its own flags by setting PF_FREEZE. This is not clean in an SMP environment. freeze(process) is therefore not SMP safe! Signed-off-by: Christoph Lameter Signed-off-by: Linus Torvalds --- drivers/media/dvb/dvb-core/dvb_frontend.c | 3 +-- drivers/media/video/msp3400.c | 3 +-- drivers/media/video/video-buf-dvb.c | 3 +-- 3 files changed, 3 insertions(+), 6 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/dvb/dvb-core/dvb_frontend.c b/drivers/media/dvb/dvb-core/dvb_frontend.c index d6b7a9de471..f11daae91cd 100644 --- a/drivers/media/dvb/dvb-core/dvb_frontend.c +++ b/drivers/media/dvb/dvb-core/dvb_frontend.c @@ -391,8 +391,7 @@ static int dvb_frontend_thread(void *data) break; } - if (current->flags & PF_FREEZE) - refrigerator(PF_FREEZE); + try_to_freeze(); if (down_interruptible(&fepriv->sem)) break; diff --git a/drivers/media/video/msp3400.c b/drivers/media/video/msp3400.c index 1b7d38e96f1..b4ee9dfe6d4 100644 --- a/drivers/media/video/msp3400.c +++ b/drivers/media/video/msp3400.c @@ -750,8 +750,7 @@ static int msp34xx_sleep(struct msp3400c *msp, int timeout) #endif } } - if (current->flags & PF_FREEZE) - refrigerator(PF_FREEZE); + try_to_freeze(); remove_wait_queue(&msp->wq, &wait); return msp->restart; } diff --git a/drivers/media/video/video-buf-dvb.c b/drivers/media/video/video-buf-dvb.c index 5f870075b55..15f5bb48696 100644 --- a/drivers/media/video/video-buf-dvb.c +++ b/drivers/media/video/video-buf-dvb.c @@ -62,8 +62,7 @@ static int videobuf_dvb_thread(void *data) break; if (kthread_should_stop()) break; - if (current->flags & PF_FREEZE) - refrigerator(PF_FREEZE); + try_to_freeze(); /* feed buffer data to demux */ if (buf->state == STATE_DONE) -- cgit