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Commit 16a0ce4e authored by Mark Brown's avatar Mark Brown
Browse files

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: default avatarMark Brown <broonie@linaro.org>
parent 38dbfb59

drivers/spi/spi.c

+11 −1
Original line number Diff line number Diff line
@@ -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);