If mutex_lock waits, it will return in state TASK_RUNNING,
rubbing out the effect of prepare_to_wait().
Signed-off-by: Tim Bird <tim.bird@xxxxxxxxxxx>
---
drivers/staging/android/logger.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)
diff --git a/drivers/staging/android/logger.c b/drivers/staging/android/logger.c
index 92cfd94..54b7cdf 100644
--- a/drivers/staging/android/logger.c
+++ b/drivers/staging/android/logger.c
@@ -172,9 +172,10 @@ static ssize_t logger_read(struct file *file, char __user *buf,
start:
while (1) {
+ mutex_lock(&log->mutex);
+
prepare_to_wait(&log->wq, &wait, TASK_INTERRUPTIBLE);
- mutex_lock(&log->mutex);
ret = (log->w_off == reader->r_off);
mutex_unlock(&log->mutex);
if (!ret)
--
1.7.2.3
--
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