ps3fb: atomic fixes

ps3fb: Use atomic_dec_if_positive() instead of bogus atomic_read()/atomic_dec()
combinations

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 8 deletions

diff --git a/drivers/video/ps3fb.c b/drivers/video/ps3fb.c
index 815b3cc78fd3..dd6dd6e222d7 100644
--- a/drivers/video/ps3fb.c
+++ b/drivers/video/ps3fb.c
@@ -680,13 +680,10 @@ EXPORT_SYMBOL_GPL(ps3fb_wait_for_vsync);
 
 void ps3fb_flip_ctl(int on)
 {
-        if (on) {
-                if (atomic_read(&ps3fb.ext_flip) > 0) {
-                        atomic_dec(&ps3fb.ext_flip);
-                }
-        } else {
+        if (on)
+                atomic_dec_if_positive(&ps3fb.ext_flip);
+        else
                 atomic_inc(&ps3fb.ext_flip);
-        }
 }
 
 EXPORT_SYMBOL_GPL(ps3fb_flip_ctl);
@@ -786,8 +783,7 @@ static int ps3fb_ioctl(struct fb_info *info, unsigned int cmd,
 
         case PS3FB_IOCTL_OFF:
                 DPRINTK("PS3FB_IOCTL_OFF:\n");
-                if (atomic_read(&ps3fb.ext_flip) > 0)
-                        atomic_dec(&ps3fb.ext_flip);
+                atomic_dec_if_positive(&ps3fb.ext_flip);
                 retval = 0;
                 break;