+Paul
Felipe Balbi <balbi@xxxxxx> writes:
> if we allow compiler reorder our writes, we could
> fall into a situation where dev->buf_len is reset
> for no apparent reason.
Any chance this would help with the bug Paul found with I2C timeouts on
beagle userspace startup?
Kevin
> This bug was found with a simple script which would
> transfer data to an i2c client from 1 to 1024 bytes
> (a simple for loop), when we got to transfer sizes
> bigger than the fifo size, dev->buf_len was reset
> to zero before we had an oportunity to handle XDR
> Interrupt. Because dev->buf_len was zero, we entered
> omap_i2c_transmit_data() to transfer zero bytes,
> which would mean we would just silently exit
> omap_i2c_transmit_data() without actually writing
> anything to DATA register. That would cause XDR
> IRQ to trigger forever and we would never transfer
> the remaining bytes.
>
> After adding the memory barrier, we also drop resetting
> dev->buf_len to zero in omap_i2c_xfer_msg() because
> both omap_i2c_transmit_data() and omap_i2c_receive_data()
> will act until dev->buf_len reaches zero, rendering the
> other write in omap_i2c_xfer_msg() redundant.
>
> This patch has been tested with pandaboard for a few
> iterations of the script mentioned above.
>
> Signed-off-by: Felipe Balbi <balbi@xxxxxx>
> ---
>
> This bug has been there forever, but it's quite annoying.
> I think it deserves being pushed upstream during this -rc
> cycle, but if Wolfram decides to wait until v3.8, I don't
> mind.
>
> drivers/i2c/busses/i2c-omap.c | 2 +-
> 1 file changed, 1 insertion(+), 1 deletion(-)
>
> diff --git a/drivers/i2c/busses/i2c-omap.c b/drivers/i2c/busses/i2c-omap.c
> index db31eae..1ec4e6e 100644
> --- a/drivers/i2c/busses/i2c-omap.c
> +++ b/drivers/i2c/busses/i2c-omap.c
> @@ -521,6 +521,7 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> /* REVISIT: Could the STB bit of I2C_CON be used with probing? */
> dev->buf = msg->buf;
> dev->buf_len = msg->len;
> + wmb();
>
> omap_i2c_write_reg(dev, OMAP_I2C_CNT_REG, dev->buf_len);
>
> @@ -579,7 +580,6 @@ static int omap_i2c_xfer_msg(struct i2c_adapter *adap,
> */
> timeout = wait_for_completion_timeout(&dev->cmd_complete,
> OMAP_I2C_TIMEOUT);
> - dev->buf_len = 0;
> if (timeout == 0) {
> dev_err(dev->dev, "controller timed out\n");
> omap_i2c_init(dev);
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