3.13.11-ckt22 -stable review patch. If anyone has any objections, please let
me know.
------------------
From: Pelle Nilsson <per.nils...@xelmo.com>
commit 7d0ec8b6f40b356f780b79de63eeafd6b907d68c upstream.
Some controller drivers have no need of this callback (spi-altera even
causes a NULL pointer dereference because it doesn't register the callback,
falsely assuming that it is already optional).
Fixes: 30af9b558a56 ("spi/bitbang: Drop empty setup() functions")
Signed-off-by: Pelle Nilsson <per.nils...@xelmo.com>
Reviewed-by: Ezequiel Garcia <ezequiel.gar...@vanguardiasur.com.ar>
Signed-off-by: Mark Brown <broo...@kernel.org>
Signed-off-by: Kamal Mostafa <ka...@canonical.com>
---
drivers/spi/spi-bitbang.c | 17 ++++++++++-------
1 file changed, 10 insertions(+), 7 deletions(-)
diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c
index bd222f6..4244415 100644
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -185,7 +185,6 @@ int spi_bitbang_setup(struct spi_device *spi)
{
struct spi_bitbang_cs *cs = spi->controller_state;
struct spi_bitbang *bitbang;
- int retval;
unsigned long flags;
bitbang = spi_master_get_devdata(spi->master);
@@ -202,9 +201,11 @@ int spi_bitbang_setup(struct spi_device *spi)
if (!cs->txrx_word)
return -EINVAL;
- retval = bitbang->setup_transfer(spi, NULL);
- if (retval < 0)
- return retval;
+ if (bitbang->setup_transfer) {
+ int retval = bitbang->setup_transfer(spi, NULL);
+ if (retval < 0)
+ return retval;
+ }
dev_dbg(&spi->dev, "%s, %u nsec/bit\n", __func__, 2 * cs->nsecs);
@@ -300,9 +301,11 @@ static int spi_bitbang_transfer_one(struct spi_master
*master,
/* init (-1) or override (1) transfer params */
if (do_setup != 0) {
- status = bitbang->setup_transfer(spi, t);
- if (status < 0)
- break;
+ if (bitbang->setup_transfer) {
+ status = bitbang->setup_transfer(spi, t);
+ if (status < 0)
+ break;
+ }
if (do_setup == -1)
do_setup = 0;
}
--
1.9.1
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