V4L/DVB (4914): Saa7146: Protect access to the IER register by a spinlock

Protect the access to the IER register of the SAA7146 by the device
spinlock. I2C transfers may use interrupt mode now.

Signed-off-by: Oliver Endriss <o.endriss@gmx.de>
Signed-off-by: Mauro Carvalho Chehab <mchehab@infradead.org>
1 file changed