OMAP: DSS2: OMAPFB: Convert the memory region locking to rwsem

R/W semaphore is a good fit for the memory region locking pattern.
So use it.

Signed-off-by: Ville Syrjälä <ville.syrjala@nokia.com>
Signed-off-by: Tomi Valkeinen <tomi.valkeinen@nokia.com>

1 files changed, 2 insertions, 8 deletions

diff --git a/drivers/video/omap2/omapfb/omapfb-sysfs.c b/drivers/video/omap2/omapfb/omapfb-sysfs.c
index 74c11b243100..724b760404f2 100644
--- a/drivers/video/omap2/omapfb/omapfb-sysfs.c
+++ b/drivers/video/omap2/omapfb/omapfb-sysfs.c
@@ -452,13 +452,7 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr,
 
         rg = ofbi->region;
 
-        /* FIXME probably should be a rwsem ... */
-        mutex_lock(&rg->mtx);
-        while (rg->ref) {
-                mutex_unlock(&rg->mtx);
-                schedule();
-                mutex_lock(&rg->mtx);
-        }
+        down_write(&rg->lock);
 
         if (atomic_read(&rg->map_count)) {
                 r = -EBUSY;
@@ -490,7 +484,7 @@ static ssize_t store_size(struct device *dev, struct device_attribute *attr,
 
         r = count;
 out:
-        mutex_unlock(&rg->mtx);
+        up_write(&rg->lock);
 
         unlock_fb_info(fbi);