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spi: Add a timeout when waiting for transfers 

Don't wait indefinitely for transfers to complete but time out after 10ms
more than we expect the transfer to take on the wire.

Signed-off-by: Mark Brown <broonie@linaro.org>
This commit is contained in:
Mark Brown 2014-01-30 22:16:41 +00:00
parent 38dbfb59d1
commit 16a0ce4e10
1 changed files with 11 additions and 1 deletions
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12
drivers/spi/spi.c
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@ -594,6 +594,7 @@ static int spi_transfer_one_message(struct spi_master *master,
bool cur_cs = true;
bool keep_cs = false;
int ret = 0;
int ms = 1;
spi_set_cs(msg->spi, true);
@ -611,7 +612,16 @@ static int spi_transfer_one_message(struct spi_master *master,
if (ret > 0) {
ret = 0;
wait_for_completion(&master->xfer_completion);
ms = xfer->len * 8 * 1000 / xfer->speed_hz;
ms += 10; /* some tolerance */
ms = wait_for_completion_timeout(&master->xfer_completion,
msecs_to_jiffies(ms));
}
if (ms == 0) {
dev_err(&msg->spi->dev, "SPI transfer timed out\n");
msg->status = -ETIMEDOUT;
}
trace_spi_transfer_stop(msg, xfer);