posix-timers: convert to idr_alloc()

Convert to the much saner new idr interface.

Signed-off-by: Tejun Heo <tj@kernel.org>
Cc: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 10 deletions

diff --git a/kernel/posix-timers.c b/kernel/posix-timers.c
index 7edfe4b901e..6edbb2c55c2 100644
--- a/kernel/posix-timers.c
+++ b/kernel/posix-timers.c
@@ -552,24 +552,22 @@ SYSCALL_DEFINE3(timer_create, const clockid_t, which_clock,
                 return -EAGAIN;
 
         spin_lock_init(&new_timer->it_lock);
- retry:
-        if (unlikely(!idr_pre_get(&posix_timers_id, GFP_KERNEL))) {
-                error = -EAGAIN;
-                goto out;
-        }
+
+        idr_preload(GFP_KERNEL);
         spin_lock_irq(&idr_lock);
-        error = idr_get_new(&posix_timers_id, new_timer, &new_timer_id);
+        error = idr_alloc(&posix_timers_id, new_timer, 0, 0, GFP_NOWAIT);
         spin_unlock_irq(&idr_lock);
-        if (error) {
-                if (error == -EAGAIN)
-                        goto retry;
+        idr_preload_end();
+        if (error < 0) {
                 /*
                  * Weird looking, but we return EAGAIN if the IDR is
                  * full (proper POSIX return value for this)
                  */
-                error = -EAGAIN;
+                if (error == -ENOSPC)
+                        error = -EAGAIN;
                 goto out;
         }
+        new_timer_id = error;
 
         it_id_set = IT_ID_SET;
         new_timer->it_id = (timer_t) new_timer_id;