[PATCH 2/7] uvesafb: always use mutexes when accessing uvfb_tasks

[Michal Januszewski]

Accesses to the uvfb_tasks array should be always be protected by a
mutex to avoid race conditions.

Signed-off-by: Michal Januszewski <spock@xxxxxxxxxx>
---
diff --git a/drivers/video/uvesafb.c b/drivers/video/uvesafb.c
index aa5a9c3..e480670 100644
--- a/drivers/video/uvesafb.c
+++ b/drivers/video/uvesafb.c
@@ -208,6 +208,10 @@ static int uvesafb_exec(struct uvesafb_ktask *task)
 		err = !wait_for_completion_timeout(task->done,
 				msecs_to_jiffies(UVESAFB_TIMEOUT));
 
+	mutex_lock(&uvfb_lock);
+	uvfb_tasks[seq] = NULL;
+	mutex_unlock(&uvfb_lock);
+
 	seq++;
 	if (seq >= UVESAFB_TASKS_MAX)
 		seq = 0;


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