From: Jean Delvare <khali@xxxxxxxxxxxx>
Don't just check for nacks on zero-length transactions. Check on
other transactions too.
Signed-off-by: Jean Delvare <khali@xxxxxxxxxxxx>
Signed-off-by: Andy Walls <awalls@xxxxxxxxxxxxxxxx>
---
drivers/media/video/cx23885/cx23885-i2c.c | 8 ++++++++
1 files changed, 8 insertions(+), 0 deletions(-)
diff --git a/drivers/media/video/cx23885/cx23885-i2c.c b/drivers/media/video/cx23885/cx23885-i2c.c
index 154c914..afb8d6f 100644
--- a/drivers/media/video/cx23885/cx23885-i2c.c
+++ b/drivers/media/video/cx23885/cx23885-i2c.c
@@ -125,6 +125,10 @@ static int i2c_sendbytes(struct i2c_adapter *i2c_adap,
goto err;
if (retval == 0)
goto eio;
+ if (!i2c_slave_did_ack(i2c_adap)) {
+ retval = -ENXIO;
+ goto err;
+ }
if (i2c_debug) {
printk(" <W %02x %02x", msg->addr << 1, msg->buf[0]);
if (!(ctrl & I2C_NOSTOP))
@@ -214,6 +218,10 @@ static int i2c_readbytes(struct i2c_adapter *i2c_adap,
goto err;
if (retval == 0)
goto eio;
+ if (cnt == 0 && !i2c_slave_did_ack(i2c_adap)) {
+ retval = -ENXIO;
+ goto err;
+ }
msg->buf[cnt] = cx_read(bus->reg_rdata) & 0xff;
if (i2c_debug) {
dprintk(1, " %02x", msg->buf[cnt]);
--
1.7.1.1
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