spi: spi-bitbang: Fix conversion of spi_bitbang_transfer_one()

Since commit 2025172e3 (spi/bitbang: Use core message pump), the following
kernel crash is seen:

Unable to handle kernel NULL pointer dereference at virtual address 0000000d
pgd = 80004000
[0000000d] *pgd=00000000
Internal error: Oops: 5 [#1] SMP ARM
Modules linked in:
CPU: 1 PID: 48 Comm: spi32766 Not tainted 3.11.0-rc1+ #4
task: bfa3e580 ti: bfb90000 task.ti: bfb90000
PC is at spi_bitbang_transfer_one+0x50/0x248
LR is at spi_bitbang_transfer_one+0x20/0x248
...

,and also the following build warning:

drivers/spi/spi-bitbang.c: In function 'spi_bitbang_start':
drivers/spi/spi-bitbang.c:436:31: warning: assignment from incompatible pointer type [enabled by default]

In order to fix it, we need to change the first parameter of
spi_bitbang_transfer_one() to 'struct spi_master *master'.

Tested on a mx6qsabrelite by succesfully probing a SPI NOR flash.

Signed-off-by: Fabio Estevam <fabio.estevam@freescale.com>
Signed-off-by: Mark Brown <broonie@linaro.org>

1 files changed, 4 insertions, 3 deletions

diff --git a/drivers/spi/spi-bitbang.c b/drivers/spi/spi-bitbang.c
index c100875cfd42..a89178dc8498 100644
--- a/drivers/spi/spi-bitbang.c
+++ b/drivers/spi/spi-bitbang.c
@@ -270,7 +270,7 @@ static int spi_bitbang_prepare_hardware(struct spi_master *spi)
         return 0;
 }
 
-static int spi_bitbang_transfer_one(struct spi_device *spi,
+static int spi_bitbang_transfer_one(struct spi_master *master,
                                     struct spi_message *m)
 {
         struct spi_bitbang      *bitbang;
@@ -280,8 +280,9 @@ static int spi_bitbang_transfer_one(struct spi_device *spi,
         unsigned                cs_change;
         int                     status;
         int                     do_setup = -1;
+        struct spi_device       *spi = m->spi;
 
-        bitbang = spi_master_get_devdata(spi->master);
+        bitbang = spi_master_get_devdata(master);
 
         /* FIXME this is made-up ... the correct value is known to
          * word-at-a-time bitbang code, and presumably chipselect()
@@ -372,7 +373,7 @@ static int spi_bitbang_transfer_one(struct spi_device *spi,
                 ndelay(nsecs);
         }
 
-        spi_finalize_current_message(spi->master);
+        spi_finalize_current_message(master);
 
         return status;
 }