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authorOliver Endriss <o.endriss@gmx.de>2009-02-28 10:35:48 -0300
committerMauro Carvalho Chehab <mchehab@redhat.com>2009-03-30 12:43:08 -0300
commit632fe9fe440249642845675d97436c667cbbd21e (patch)
tree2c247394a041a927e1a282b1488ddd249794ee36 /drivers/media
parent7c9e34aaab50a6c8f69ce59816dd76a283090667 (diff)
V4L/DVB (10843): saa7146: Clean-up i2c error handling
saa7146: Clean-up i2c error handling Simplify i2c error handling and fix incorrect handling of address errors in poll mode. Signed-off-by: Oliver Endriss <o.endriss@gmx.de> Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media')
-rw-r--r--drivers/media/common/saa7146_i2c.c21
1 files changed, 6 insertions, 15 deletions
diff --git a/drivers/media/common/saa7146_i2c.c b/drivers/media/common/saa7146_i2c.c
index 76229f99227..7e8f5681599 100644
--- a/drivers/media/common/saa7146_i2c.c
+++ b/drivers/media/common/saa7146_i2c.c
@@ -293,7 +293,6 @@ static int saa7146_i2c_transfer(struct saa7146_dev *dev, const struct i2c_msg *m
int i = 0, count = 0;
__le32 *buffer = dev->d_i2c.cpu_addr;
int err = 0;
- int address_err = 0;
int short_delay = 0;
if (mutex_lock_interruptible(&dev->i2c_lock))
@@ -333,17 +332,10 @@ static int saa7146_i2c_transfer(struct saa7146_dev *dev, const struct i2c_msg *m
i2c address probing, however, and address errors indicate that a
device is really *not* there. retrying in that case
increases the time the device needs to probe greatly, so
- it should be avoided. because of the fact, that only
- analog based cards use irq based i2c transactions (for dvb
- cards, this screwes up other interrupt sources), we bail out
- completely for analog cards after an address error and trust
- the saa7146 address error detection. */
- if ( -EREMOTEIO == err ) {
- if( 0 != (SAA7146_USE_I2C_IRQ & dev->ext->flags)) {
- goto out;
- }
- address_err++;
- }
+ it should be avoided. So we bail out in irq mode after an
+ address error and trust the saa7146 address error detection. */
+ if (-EREMOTEIO == err && 0 != (SAA7146_USE_I2C_IRQ & dev->ext->flags))
+ goto out;
DEB_I2C(("error while sending message(s). starting again.\n"));
break;
}
@@ -358,10 +350,9 @@ static int saa7146_i2c_transfer(struct saa7146_dev *dev, const struct i2c_msg *m
} while (err != num && retries--);
- /* if every retry had an address error, exit right away */
- if (address_err == retries) {
+ /* quit if any error occurred */
+ if (err != num)
goto out;
- }
/* if any things had to be read, get the results */
if ( 0 != saa7146_i2c_msg_cleanup(msgs, num, buffer)) {