spi: sh-msiof: Improve transfer error handling
- Add a timeout when waiting for the transfer complete interrupt,
- If sh_msiof_spi_stop() fails, there's no need to clear IER, as the
interrupt handler has already done that,
- Propagate transfer failures in sh_msiof_transfer_one().
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Mark Brown <broonie@linaro.org>
diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 2cd5fcb..e5894a6 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -575,11 +575,16 @@
ret = sh_msiof_spi_start(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to start hardware\n");
- goto err;
+ goto stop_ier;
}
/* wait for tx fifo to be emptied / rx fifo to be filled */
- wait_for_completion(&p->done);
+ ret = wait_for_completion_timeout(&p->done, HZ);
+ if (!ret) {
+ dev_err(&p->pdev->dev, "PIO timeout\n");
+ ret = -ETIMEDOUT;
+ goto stop_reset;
+ }
/* read rx fifo */
if (rx_buf)
@@ -591,12 +596,15 @@
ret = sh_msiof_spi_stop(p, rx_buf);
if (ret) {
dev_err(&p->pdev->dev, "failed to shut down hardware\n");
- goto err;
+ return ret;
}
return words;
- err:
+stop_reset:
+ sh_msiof_reset_str(p);
+ sh_msiof_spi_stop(p, rx_buf);
+stop_ier:
sh_msiof_write(p, IER, 0);
return ret;
}
@@ -679,7 +687,7 @@
rx_buf,
words, bits);
if (n < 0)
- break;
+ return n;
bytes_done += n * bytes_per_word;
words -= n;