diff options
| author |   Nicolas Boichat <drinkcat@chromium.org> | 2015-08-17 11:52:54 +0800 |
|---|---|---|
| committer |   Mark Brown <broonie@kernel.org> | 2015-09-17 12:13:40 +0100 |
| commit | c15f6ed3a18f10cdc33f64906ab353f17a6df114 (patch) | |
| tree | d31632b7d325d16e602437062832c01eabae2451 /include/linux/spi | |
| parent | Linux 4.3-rc1 (diff) | |
| download | linux-dev-c15f6ed3a18f10cdc33f64906ab353f17a6df114.tar.xz linux-dev-c15f6ed3a18f10cdc33f64906ab353f17a6df114.zip | |
spi: bitbang: Replace spinlock by mutex
chipselect (in the case of spi-gpio: spi_gpio_chipselect, which
calls gpiod_set_raw_value_cansleep) can sleep, so we should not
hold a spinlock while calling it from spi_bitbang_setup.
This issue was introduced by this commit, which converted spi-gpio
to cansleep variants:
d9dda5a191 "spi: spi-gpio: Use 'cansleep' variants to access GPIO"
Replacing the lock variable by a mutex fixes the issue: This is
safe as all instances where the lock is used are called from
contexts that can sleep.
Finally, update spi-ppc4xx and and spi-s3c24xx to use mutex
functions, as they directly hold the lock for similar purpose.
Signed-off-by: Nicolas Boichat <drinkcat@chromium.org>
Signed-off-by: Mark Brown <broonie@kernel.org>
Diffstat (limited to 'include/linux/spi')
| -rw-r--r-- | include/linux/spi/spi_bitbang.h | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/include/linux/spi/spi_bitbang.h b/include/linux/spi/spi_bitbang.h index 85578d4be034..154788ed218c 100644 --- a/include/linux/spi/spi_bitbang.h +++ b/include/linux/spi/spi_bitbang.h @@ -4,7 +4,7 @@ #include <linux/workqueue.h> struct spi_bitbang { - spinlock_t lock; + struct mutex lock; u8 busy; u8 use_dma; u8 flags; /* extra spi->mode support */ |