Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1759038AbYGaCuH (ORCPT ); Wed, 30 Jul 2008 22:50:07 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S1758136AbYGaCsy (ORCPT ); Wed, 30 Jul 2008 22:48:54 -0400 Received: from SpacedOut.fries.net ([67.64.210.234]:60530 "EHLO SpacedOut.fries.net" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1756725AbYGaCsw (ORCPT ); Wed, 30 Jul 2008 22:48:52 -0400 Date: Wed, 30 Jul 2008 21:48:18 -0500 From: David Fries To: Andrew Morton Cc: Evgeniy Polyakov , linux-kernel@vger.kernel.org Subject: [PATCH 4/30] W1: w1_process, block or sleep Message-ID: <20080731024818.GE12181@spacedout.fries.net> References: <20080729020433.GA24424@spacedout.fries.net> <20080729161356.2de456fb.akpm@linux-foundation.org> Mime-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <20080729161356.2de456fb.akpm@linux-foundation.org> User-Agent: Mutt/1.5.4i X-Greylist: Sender is SPF-compliant, not delayed by milter-greylist-3.0 (SpacedOut.fries.net [127.0.0.1]); Wed, 30 Jul 2008 21:48:19 -0500 (CDT) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3747 Lines: 119 The w1_process thread's sleeping and termination has been modified. msleep_interruptible was replaced by schedule_timeout and schedule to allow for kthread_stop and wake_up_process to interrupt the sleep and the unbounded sleeping when a bus search is disabled. The W1_MASTER_NEED_EXIT and flags variable were removed as they were redundant with kthread_should_stop and kthread_stop. If w1_process is sleeping, requesting a search will immediately wake it up rather than waiting for the end of msleep_interruptible previously. Signed-off-by: David Fries Signed-off-by: Evgeniy Polyakov --- drivers/w1/w1.c | 20 +++++++++++++++++--- drivers/w1/w1.h | 4 ---- drivers/w1/w1_int.c | 2 -- 3 files changed, 17 insertions(+), 9 deletions(-) diff --git a/drivers/w1/w1.c b/drivers/w1/w1.c index 730faa4..9b5c117 100644 --- a/drivers/w1/w1.c +++ b/drivers/w1/w1.c @@ -251,6 +251,7 @@ static ssize_t w1_master_attribute_store_search(struct device * dev, mutex_lock(&md->mutex); md->search_count = simple_strtol(buf, NULL, 0); mutex_unlock(&md->mutex); + wake_up_process(md->thread); return count; } @@ -773,7 +774,7 @@ void w1_search(struct w1_master *dev, u8 search_type, w1_slave_found_callback cb tmp64 = (triplet_ret >> 2); rn |= (tmp64 << i); - if (test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + if (kthread_should_stop()) { printk(KERN_INFO "Abort w1_search (exiting)\n"); return; } @@ -811,8 +812,12 @@ void w1_search_process(struct w1_master *dev, u8 search_type) int w1_process(void *data) { struct w1_master *dev = (struct w1_master *) data; + /* As long as w1_timeout is only set by a module parameter the sleep + * time can be calculated in jiffies once. + */ + const unsigned long jtime = msecs_to_jiffies(w1_timeout * 1000); - while (!kthread_should_stop() && !test_bit(W1_MASTER_NEED_EXIT, &dev->flags)) { + while (!kthread_should_stop()) { if (dev->search_count) { mutex_lock(&dev->mutex); w1_search_process(dev, W1_SEARCH); @@ -820,7 +825,16 @@ int w1_process(void *data) } try_to_freeze(); - msleep_interruptible(w1_timeout * 1000); + __set_current_state(TASK_INTERRUPTIBLE); + + if (kthread_should_stop()) + break; + + /* Only sleep when the search is active. */ + if (dev->search_count) + schedule_timeout(jtime); + else + schedule(); } atomic_dec(&dev->refcnt); diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h index 13e0ea8..34ee01e 100644 --- a/drivers/w1/w1.h +++ b/drivers/w1/w1.h @@ -149,8 +149,6 @@ struct w1_bus_master u8, w1_slave_found_callback); }; -#define W1_MASTER_NEED_EXIT 0 - struct w1_master { struct list_head w1_master_entry; @@ -169,8 +167,6 @@ struct w1_master void *priv; int priv_size; - long flags; - struct task_struct *thread; struct mutex mutex; diff --git a/drivers/w1/w1_int.c b/drivers/w1/w1_int.c index 36ff402..bd877b2 100644 --- a/drivers/w1/w1_int.c +++ b/drivers/w1/w1_int.c @@ -142,7 +142,6 @@ int w1_add_master_device(struct w1_bus_master *master) #if 0 /* Thread cleanup code, not required currently. */ err_out_kill_thread: - set_bit(W1_MASTER_NEED_EXIT, &dev->flags); kthread_stop(dev->thread); #endif err_out_rm_attr: @@ -158,7 +157,6 @@ void __w1_remove_master_device(struct w1_master *dev) struct w1_netlink_msg msg; struct w1_slave *sl, *sln; - set_bit(W1_MASTER_NEED_EXIT, &dev->flags); kthread_stop(dev->thread); mutex_lock(&w1_mlock); -- 1.4.4.4 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/