[PATCH] fix of mutex locking bug in fops_read

[Tobias Lorenz <tobias.lorenz@gmx.net>]

This patch fixes a mutex locking bug causing userspace processes
to hang indefinitely upon reading the radio device for RDS data.

Signed-off-by: Nils Faerber <nils.faerber@kernelconcepts.de>
Acked-by: Tobias Lorenz <tobias.lorenz@gmx.net>
---
 drivers/media/radio/si470x/radio-si470x-common.c |    1 -
 1 files changed, 0 insertions(+), 1 deletions(-)

diff --git a/drivers/media/radio/si470x/radio-si470x-common.c
b/drivers/media/radio/si470x/radio-si470x-common.c
index 4c69698..41ee757 100644
--- a/drivers/media/radio/si470x/radio-si470x-common.c
+++ b/drivers/media/radio/si470x/radio-si470x-common.c
@@ -483,7 +483,6 @@ static ssize_t si470x_fops_read(struct file *file,
char __user *buf,
 	count /= 3;
 
 	/* copy RDS block out of internal buffer and to user buffer */
-	mutex_lock(&radio->lock);
 	while (block_count < count) {
 		if (radio->rd_index == radio->wr_index)
 			break;
-- 
1.7.2.3