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From: Michal Nazarewicz on 5 May 2010 07:00
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(a)samsung.com>
Cc: Kyungmin Park <kyungmin.park(a)samsung.com>
Cc: Marek Szyprowski <m.szyprowski(a)samsung.com>
---
fs/timerfd.c | 25 ++++---------------------
1 files changed, 4 insertions(+), 21 deletions(-)

diff --git a/fs/timerfd.c b/fs/timerfd.c
index 98158de..b86ab8e 100644
--- a/fs/timerfd.c
+++ b/fs/timerfd.c
@@ -110,31 +110,14 @@ 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)
+ res = -EAGAIN;
+ else
+ res = wait_event_interruptible_locked_irq(ctx->wqh, ctx->ticks);
if (ctx->ticks) {
ticks = ctx->ticks;
if (ctx->expired && ctx->tintv.tv64) {
--
1.7.1

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Prev: [PATCHv4 7/8] USB: testusb: an USB testing application
Next: tty: make atomic_write_lock release tty_lock