[media] s5p-fimc: Don't use mutex_lock_interruptible() in device release()

Use uninterruptible mutex_lock in the release() file op to make
sure all resources are properly freed when a process is being
terminated. Returning -ERESTARTSYS has no effect for a terminating
process and this caused driver resources not to be released. Not
releasing the buffer queue also prevented other drivers to free
memory, e.g. in MMAP -> USERPTR scenario.
This patch is required for stable kernels v3.6+.

Reported-by: Kamil Debski <k.debski@samsung.com>
Reported-by: Marek Szyprowski <m.szyprowski@samsung.com>
Signed-off-by: Sylwester Nawrocki <s.nawrocki@samsung.com>
Signed-off-by: Kyungmin Park <kyungmin.park@samsung.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>

2 files changed, 2 insertions, 4 deletions

diff --git a/drivers/media/platform/s5p-fimc/fimc-capture.c b/drivers/media/platform/s5p-fimc/fimc-capture.c
index 3fc896b8eeae..891ee873c62b 100644
--- a/drivers/media/platform/s5p-fimc/fimc-capture.c
+++ b/drivers/media/platform/s5p-fimc/fimc-capture.c
@@ -556,8 +556,7 @@ static int fimc_capture_close(struct file *file)
 
         dbg("pid: %d, state: 0x%lx", task_pid_nr(current), fimc->state);
 
-        if (mutex_lock_interruptible(&fimc->lock))
-                return -ERESTARTSYS;
+        mutex_lock(&fimc->lock);
 
         if (--fimc->vid_cap.refcnt == 0) {
                 clear_bit(ST_CAPT_BUSY, &fimc->state);
diff --git a/drivers/media/platform/s5p-fimc/fimc-m2m.c b/drivers/media/platform/s5p-fimc/fimc-m2m.c
index 4500e44f6857..62afed3162ea 100644
--- a/drivers/media/platform/s5p-fimc/fimc-m2m.c
+++ b/drivers/media/platform/s5p-fimc/fimc-m2m.c
@@ -718,8 +718,7 @@ static int fimc_m2m_release(struct file *file)
         dbg("pid: %d, state: 0x%lx, refcnt= %d",
                 task_pid_nr(current), fimc->state, fimc->m2m.refcnt);
 
-        if (mutex_lock_interruptible(&fimc->lock))
-                return -ERESTARTSYS;
+        mutex_lock(&fimc->lock);
 
         v4l2_m2m_ctx_release(ctx->m2m_ctx);
         fimc_ctrls_delete(ctx);