From: Mika Westerberg Date: Wed, 22 May 2013 10:03:11 +0000 (+0300) Subject: i2c: designware: prevent signals from aborting I2C transfers X-Git-Url: http://git.cdn.openwrt.org/?a=commitdiff_plain;h=e42dba569fceca5d59a88571370785e9ce9775b8;p=openwrt%2Fstaging%2Fblogic.git i2c: designware: prevent signals from aborting I2C transfers If a process receives signal while it is waiting for I2C transfer to complete, an error is returned to the caller and the transfer is aborted. This can cause the driver to fail subsequent transfers. Also according to commit d295a86eab2 (i2c: mv64xxx: work around signals causing I2C transactions to be aborted) I2C drivers aren't supposed to abort transactions on signals. To prevent this switch to use wait_for_completion_timeout() instead of wait_for_completion_interruptible_timeout() in the designware I2C driver. Signed-off-by: Mika Westerberg Reviewed-by: Christian Ruppert Signed-off-by: Wolfram Sang --- diff --git a/drivers/i2c/busses/i2c-designware-core.c b/drivers/i2c/busses/i2c-designware-core.c index c41ca6354fc5..db20a2841b75 100644 --- a/drivers/i2c/busses/i2c-designware-core.c +++ b/drivers/i2c/busses/i2c-designware-core.c @@ -580,14 +580,13 @@ i2c_dw_xfer(struct i2c_adapter *adap, struct i2c_msg msgs[], int num) i2c_dw_xfer_init(dev); /* wait for tx to complete */ - ret = wait_for_completion_interruptible_timeout(&dev->cmd_complete, HZ); + ret = wait_for_completion_timeout(&dev->cmd_complete, HZ); if (ret == 0) { dev_err(dev->dev, "controller timed out\n"); i2c_dw_init(dev); ret = -ETIMEDOUT; goto done; - } else if (ret < 0) - goto done; + } if (dev->msg_err) { ret = dev->msg_err;