linux-kernel - [PATCHv2 2/8] fs/timerfd.c: make use of wait_event_interruptible_locked

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Date:	Fri, 09 Apr 2010 21:21:19 +0200
From:	Michal Nazarewicz <m.nazarewicz@...sung.com>
To:	linux-usb@...r.kernel.org
Cc:	Michal Nazarewicz <mina86@...a86.com>,
	Michal Nazarewicz <m.nazarewicz@...sung.com>,
	Davide Libenzi <davidel@...ilserver.org>,
	Greg KH <greg@...ah.com>,
	Kyungmin Park <kyungmin.park@...sung.com>,
	Marek Szyprowski <m.szyprowski@...sung.com>,
	Thomas Gleixner <tglx@...utronix.de>,
	linux-fsdevel@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCHv2 2/8] fs/timerfd.c: make use of
 wait_event_interruptible_locked_irq()

This patch modifies the fs/timerfd.c to use the newly created
wait_event_interruptible_locked_irq() macro.  This replaces an open
code implementation with a single macro call.

Signed-off-by: Michal Nazarewicz <m.nazarewicz@...sung.com>
Cc: Kyungmin Park <kyungmin.park@...sung.com>
Cc: Marek Szyprowski <m.szyprowski@...sung.com>
---
 fs/timerfd.c |   22 ++--------------------
 1 files changed, 2 insertions(+), 20 deletions(-)

diff --git a/fs/timerfd.c b/fs/timerfd.c
index 1bfc95a..4d2c371 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -109,31 +109,13 @@ static ssize_t timerfd_read(struct file *file, char __user *buf, size_t count,
 	struct timerfd_ctx *ctx = file->private_data;
 	ssize_t res;
 	u64 ticks = 0;
-	DECLARE_WAITQUEUE(wait, current);
 
 	if (count < sizeof(ticks))
 		return -EINVAL;
 	spin_lock_irq(&ctx->wqh.lock);
 	res = -EAGAIN;
-	if (!ctx->ticks && !(file->f_flags & O_NONBLOCK)) {
-		__add_wait_queue(&ctx->wqh, &wait);
-		for (res = 0;;) {
-			set_current_state(TASK_INTERRUPTIBLE);
-			if (ctx->ticks) {
-				res = 0;
-				break;
-			}
-			if (signal_pending(current)) {
-				res = -ERESTARTSYS;
-				break;
-			}
-			spin_unlock_irq(&ctx->wqh.lock);
-			schedule();
-			spin_lock_irq(&ctx->wqh.lock);
-		}
-		__remove_wait_queue(&ctx->wqh, &wait);
-		__set_current_state(TASK_RUNNING);
-	}
+	if (!(file->f_flags & O_NONBLOCK))
+		wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks);
 	if (ctx->ticks) {
 		ticks = ctx->ticks;
 		if (ctx->expired && ctx->tintv.tv64) {
-- 
1.7.0

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