V4L/DVB (6269): V4L: Fix a "scheduling while atomic" bug in saa7134

set_tvnorm can sleep in saa7134_i2c_xfer
(it will be called through tuner code)
but code calls it under spinlock. Fix that

Signed-off-by: Maxim Levitsky <maximlevitsky@gmail.com>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/drivers/media/video/saa7134/saa7134-video.c b/drivers/media/video/saa7134/saa7134-video.c
index cf40a9690a50..27c659cd0f30 100644
--- a/drivers/media/video/saa7134/saa7134-video.c
+++ b/drivers/media/video/saa7134/saa7134-video.c
@@ -1834,7 +1834,11 @@ static int video_do_ioctl(struct inode *inode, struct file *file,
                 if (res_check(fh, RESOURCE_OVERLAY)) {
                         spin_lock_irqsave(&dev->slock,flags);
                         stop_preview(dev,fh);
+                        spin_unlock_irqrestore(&dev->slock, flags);
+
                         set_tvnorm(dev,&tvnorms[i]);
+
+                        spin_lock_irqsave(&dev->slock, flags);
                         start_preview(dev,fh);
                         spin_unlock_irqrestore(&dev->slock,flags);
                 } else