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| author | Fabio Estevam <fabio.estevam@freescale.com> | 2013-07-17 22:49:54 +0400 |
|---|---|---|
| committer | Mark Brown <broonie@linaro.org> | 2013-07-18 02:34:27 +0400 |
| commit | d60990d597bfa2816dfe28a5c5c6787610b423e6 (patch) | |
| tree | fe937851b5700028cf3709c6cc388c168b4a6c00 /drivers/spi/spi-bitbang.c | |
| parent | 2025172e32808a327b00f968c72baa79adc594c2 (diff) | |
| download | linux-d60990d597bfa2816dfe28a5c5c6787610b423e6.tar.xz | |
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>
Diffstat (limited to 'drivers/spi/spi-bitbang.c')
| -rw-r--r-- | drivers/spi/spi-bitbang.c | 7 |
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; } |