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>
diff --git a/drivers/spi/spi.c b/drivers/spi/spi.c
index 23756b0..516643d 100644
--- a/drivers/spi/spi.c
+++ b/drivers/spi/spi.c
@@ -594,6 +594,7 @@
bool cur_cs = true;
bool keep_cs = false;
int ret = 0;
+ int ms = 1;
spi_set_cs(msg->spi, true);
@@ -611,7 +612,16 @@
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);