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Subject[PATCH 3/5] spi: sh-msiof: Improve transfer error handling
Date

- 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>
---
drivers/spi/spi-sh-msiof.c | 18 +++++++++++++-----
1 file changed, 13 insertions(+), 5 deletions(-)

diff --git a/drivers/spi/spi-sh-msiof.c b/drivers/spi/spi-sh-msiof.c
index 8bfa97e03502..29dee0436a9a 100644
--- a/drivers/spi/spi-sh-msiof.c
+++ b/drivers/spi/spi-sh-msiof.c
@@ -575,11 +575,16 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
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 @@ static int sh_msiof_spi_txrx_once(struct sh_msiof_spi_priv *p,
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 @@ static int sh_msiof_transfer_one(struct spi_master *master,
rx_buf,
words, bits);
if (n < 0)
- break;
+ return n;

bytes_done += n * bytes_per_word;
words -= n;
--
1.9.1


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