[PATCH 3.7] spi/bcm63xx: fix transfer bits_per_words check

[Jonas Gorski <jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>]

Transfers often do not have bits_per_words set, so use the spi device's
bits_per_words in this case.

This fixes the driver rejecting valid transfers e.g. generated by
spi_write() or spi_read().

Cc: stable-u79uwXL29TY76Z2rM5mHXA@public.gmane.org
Signed-off-by: Jonas Gorski <jonas.gorski-Re5JQEeQqe8AvxtiuMwx3w@public.gmane.org>
---
 drivers/spi/spi-bcm63xx.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/spi/spi-bcm63xx.c b/drivers/spi/spi-bcm63xx.c
index a9f4049..d7c2916 100644
--- a/drivers/spi/spi-bcm63xx.c
+++ b/drivers/spi/spi-bcm63xx.c
@@ -103,7 +103,8 @@ static int bcm63xx_spi_check_transfer(struct spi_device *spi,
 {
 	u8 bits_per_word;
 
-	bits_per_word = (t) ? t->bits_per_word : spi->bits_per_word;
+	bits_per_word = (t && t->bits_per_word) ?
+			t->bits_per_word : spi->bits_per_word;
 	if (bits_per_word != 8) {
 		dev_err(&spi->dev, "%s, unsupported bits_per_word=%d\n",
 			__func__, bits_per_word);
-- 
1.7.10.4


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