From 35e55255bbe1775c3cdb5d9cff494d72d5a49bf3 Mon Sep 17 00:00:00 2001 From: Hartmut Birr Date: Wed, 1 Nov 2006 13:01:42 -0300 Subject: V4L/DVB (4915): Saa7146: Add timeout protection for I2C interrupt Add a timeout to the wait for the i2c-interrupt. The timeout prevents from endless waiting if the interrupt gets lost. Signed-off-by: Hartmut Birr Signed-off-by: Oliver Endriss Signed-off-by: Mauro Carvalho Chehab --- drivers/media/common/saa7146_i2c.c | 16 ++++++++++++---- 1 file changed, 12 insertions(+), 4 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/common/saa7146_i2c.c b/drivers/media/common/saa7146_i2c.c index 5297a365c92..8c85efc2652 100644 --- a/drivers/media/common/saa7146_i2c.c +++ b/drivers/media/common/saa7146_i2c.c @@ -189,13 +189,21 @@ static int saa7146_i2c_writeout(struct saa7146_dev *dev, u32* dword, int short_d saa7146_write(dev, I2C_TRANSFER, *dword); dev->i2c_op = 1; + SAA7146_ISR_CLEAR(dev, MASK_16|MASK_17); SAA7146_IER_ENABLE(dev, MASK_16|MASK_17); saa7146_write(dev, MC2, (MASK_00 | MASK_16)); - wait_event_interruptible(dev->i2c_wq, dev->i2c_op == 0); - if (signal_pending (current)) { - /* a signal arrived */ - return -ERESTARTSYS; + timeout = HZ/100 + 1; /* 10ms */ + timeout = wait_event_interruptible_timeout(dev->i2c_wq, dev->i2c_op == 0, timeout); + if (timeout == -ERESTARTSYS || dev->i2c_op) { + SAA7146_IER_DISABLE(dev, MASK_16|MASK_17); + SAA7146_ISR_CLEAR(dev, MASK_16|MASK_17); + if (timeout == -ERESTARTSYS) + /* a signal arrived */ + return -ERESTARTSYS; + + printk(KERN_WARNING "saa7146_i2c_writeout: timed out waiting for end of xfer\n"); + return -EIO; } status = saa7146_read(dev, I2C_STATUS); } else { -- cgit v1.2.3