[PATCH v2] spi: fsl-spi: Convert to let spi core validate xfer->bits_per_word

[Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>]

Set bits_per_word_mask so spi core will reject transfers that attempt to use
an unsupported bits_per_word value.

Signed-off-by: Axel Lin <axel.lin-8E1dMatC8ynQT0dZR+AlfA@public.gmane.org>
---
v2:
Make sure bits_per_word can not be greater than mpc8xxx_spi->max_bits_per_word.

 drivers/spi/spi-fsl-spi.c | 7 +++----
 1 file changed, 3 insertions(+), 4 deletions(-)

diff --git a/drivers/spi/spi-fsl-spi.c b/drivers/spi/spi-fsl-spi.c
index 4dcb292..c4f9143 100644
--- a/drivers/spi/spi-fsl-spi.c
+++ b/drivers/spi/spi-fsl-spi.c
@@ -239,10 +239,7 @@ static int fsl_spi_setup_transfer(struct spi_device *spi,
 	if (!bits_per_word)
 		bits_per_word = spi->bits_per_word;
 
-	/* Make sure its a bit width we support [4..16, 32] */
-	if ((bits_per_word < 4)
-	    || ((bits_per_word > 16) && (bits_per_word != 32))
-	    || (bits_per_word > mpc8xxx_spi->max_bits_per_word))
+	if (bits_per_word > mpc8xxx_spi->max_bits_per_word)
 		return -EINVAL;
 
 	if (!hz)
@@ -631,6 +628,8 @@ static struct spi_master * fsl_spi_probe(struct device *dev,
 
 	master->setup = fsl_spi_setup;
 	master->cleanup = fsl_spi_cleanup;
+	master->bits_per_word_mask = SPI_BPW_RANGE_MASK(4, 16) |
+				     SPI_BPW_MASK(32);
 
 	mpc8xxx_spi = spi_master_get_devdata(master);
 	mpc8xxx_spi->spi_do_one_msg = fsl_spi_do_one_msg;
-- 
1.8.1.2



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