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Commit 88bbdf74 authored by Hartmut Birr's avatar Hartmut Birr Committed by Mauro Carvalho Chehab
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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: default avatarOliver Endriss <o.endriss@gmx.de>
Signed-off-by: default avatarMauro Carvalho Chehab <mchehab@infradead.org>
parent 122b5dbe

include/media/saa7146.h

+14 −4
Original line number Diff line number Diff line
@@ -43,9 +43,19 @@ extern unsigned int saa7146_debug; 
#define DEB_CAP(x)  if (0!=(DEBUG_VARIABLE&0x40)) { DEBUG_PROLOG; printk x; } /* capture debug messages */



#define SAA7146_IER_DISABLE(x,y) 					\

	saa7146_write(x, IER, saa7146_read(x, IER) & ~(y));

	do { 								\

		unsigned int flags; 					\

		spin_lock_irqsave(&x->int_slock, flags); 		\

		saa7146_write(x, IER, saa7146_read(x, IER) & ~(y));	\

		spin_unlock_irqrestore(&x->int_slock, flags);		\

	} while(0)

#define SAA7146_IER_ENABLE(x,y)						\

	saa7146_write(x, IER, saa7146_read(x, IER) | (y));

	do { 								\

		unsigned int flags; 					\

		spin_lock_irqsave(&x->int_slock, flags); 		\

		saa7146_write(x, IER, saa7146_read(x, IER) | (y));	\

		spin_unlock_irqrestore(&x->int_slock, flags);		\

	} while(0)

#define SAA7146_ISR_CLEAR(x,y) \

	saa7146_write(x, ISR, (y));