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i2c: davinci: don't use interruptible completion 

When a signal is caught while the i2c-davinci bus driver is
transferring, the driver just "abandons" the transfer and leaves the
controller to fend for itself. The next I2C transaction will find the
controller in an undefined state and often results in a stream of
"initiating i2c bus recovery" messages until the controller arrives in a
defined state. This behaviour also sends out "half" or possibly even
mixed messages to I2C client devices which may put them in an undesired
state as well. So, let's get simply uninterruptible.

Signed-off-by: Mike Looijmans <mike.looijmans@topic.nl>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Mike Looijmans 2014-03-14 07:42:28 +01:00 committed by Wolfram Sang
parent 36765293cd
commit 900ef800a2
1 changed files with 1 additions and 3 deletions
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4
drivers/i2c/busses/i2c-davinci.c
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@ -368,8 +368,7 @@ i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
flag |= DAVINCI_I2C_MDR_STP;
davinci_i2c_write_reg(dev, DAVINCI_I2C_MDR_REG, flag);
r = wait_for_completion_interruptible_timeout(&dev->cmd_complete,
dev->adapter.timeout);
r = wait_for_completion_timeout(&dev->cmd_complete, dev->adapter.timeout);
if (r == 0) {
dev_err(dev->dev, "controller timed out\n");
davinci_i2c_recover_bus(dev);
@ -380,7 +379,6 @@ i2c_davinci_xfer_msg(struct i2c_adapter *adap, struct i2c_msg *msg, int stop)
if (dev->buf_len) {
/* This should be 0 if all bytes were transferred
* or dev->cmd_err denotes an error.
* A signal may have aborted the transfer.
*/
if (r >= 0) {
dev_err(dev->dev, "abnormal termination buf_len=%i\n",