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spi: fsl-lpspi: use wait_for_completion_timeout() while waiting transfer done

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It's a potential problem to use wait_for_completion() because the
completion condition may never come. Thus, it's better to repalce
wait_for_completion() with wait_for_completion_timeout().

Signed-off-by: Gao Pan <pandy.gao@nxp.com>
Signed-off-by: Mark Brown <broonie@kernel.org>
This commit is contained in:
Gao Pan 2016-11-28 11:02:59 +08:00 committed by Mark Brown
parent 14de3918ea
commit d2ad0a62d4
1 changed files with 6 additions and 1 deletions
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7
drivers/spi/spi-fsl-lpspi.c
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@ -348,7 +348,12 @@ static int fsl_lpspi_transfer_one(struct spi_master *master,
reinit_completion(&fsl_lpspi->xfer_done);
fsl_lpspi_write_tx_fifo(fsl_lpspi);
wait_for_completion(&fsl_lpspi->xfer_done);
ret = wait_for_completion_timeout(&fsl_lpspi->xfer_done, HZ);
if (!ret) {
dev_dbg(fsl_lpspi->dev, "wait for completion timeout\n");
return -ETIMEDOUT;
}
ret = fsl_lpspi_txfifo_empty(fsl_lpspi);
fsl_lpspi_read_rx_fifo(fsl_lpspi);