diff options
| author | Laurent Pinchart <laurentp@cse-semaphore.com> | 2008-08-19 14:20:23 +0200 |
|---|---|---|
| committer | Kumar Gala <galak@kernel.crashing.org> | 2008-08-21 00:15:54 -0500 |
| commit | 639d64456e20cbfc866b18dc03cf9f9babc9c7cd (patch) | |
| tree | 0e593d89118b44a500a2995af84d0f4e988affc5 | |
| parent | 61a4e9e91dd3916ef91aa4899b7271bba0248677 (diff) | |
| download | linux-639d64456e20cbfc866b18dc03cf9f9babc9c7cd.tar.gz linux-639d64456e20cbfc866b18dc03cf9f9babc9c7cd.tar.bz2 linux-639d64456e20cbfc866b18dc03cf9f9babc9c7cd.zip | |
cpm2: Fix race condition in CPM2 GPIO library.
The CPM2 GPIO library code uses the non thread-safe clrbits32/setbits32
macros. This patch protects them with a spinlock.
Signed-off-by: Laurent Pinchart <laurentp@cse-semaphore.com>
Signed-off-by: Kumar Gala <galak@kernel.crashing.org>
| -rw-r--r-- | arch/powerpc/sysdev/cpm_common.c | 37 |
1 files changed, 26 insertions, 11 deletions
diff --git a/arch/powerpc/sysdev/cpm_common.c b/arch/powerpc/sysdev/cpm_common.c index 53da8a079f96..00d3d17c84a3 100644 --- a/arch/powerpc/sysdev/cpm_common.c +++ b/arch/powerpc/sysdev/cpm_common.c @@ -254,15 +254,11 @@ static int cpm2_gpio32_get(struct gpio_chip *gc, unsigned int gpio) return !!(in_be32(&iop->dat) & pin_mask); } -static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value) +static void __cpm2_gpio32_set(struct of_mm_gpio_chip *mm_gc, u32 pin_mask, + int value) { - struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc); struct cpm2_ioports __iomem *iop = mm_gc->regs; - unsigned long flags; - u32 pin_mask = 1 << (31 - gpio); - - spin_lock_irqsave(&cpm2_gc->lock, flags); if (value) cpm2_gc->cpdata |= pin_mask; @@ -270,6 +266,18 @@ static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value) cpm2_gc->cpdata &= ~pin_mask; out_be32(&iop->dat, cpm2_gc->cpdata); +} + +static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value) +{ + struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc); + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); + + spin_lock_irqsave(&cpm2_gc->lock, flags); + + __cpm2_gpio32_set(mm_gc, pin_mask, value); spin_unlock_irqrestore(&cpm2_gc->lock, flags); } @@ -277,14 +285,17 @@ static void cpm2_gpio32_set(struct gpio_chip *gc, unsigned int gpio, int value) static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) { struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc); struct cpm2_ioports __iomem *iop = mm_gc->regs; - u32 pin_mask; + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); - pin_mask = 1 << (31 - gpio); + spin_lock_irqsave(&cpm2_gc->lock, flags); setbits32(&iop->dir, pin_mask); + __cpm2_gpio32_set(mm_gc, pin_mask, val); - cpm2_gpio32_set(gc, gpio, val); + spin_unlock_irqrestore(&cpm2_gc->lock, flags); return 0; } @@ -292,13 +303,17 @@ static int cpm2_gpio32_dir_out(struct gpio_chip *gc, unsigned int gpio, int val) static int cpm2_gpio32_dir_in(struct gpio_chip *gc, unsigned int gpio) { struct of_mm_gpio_chip *mm_gc = to_of_mm_gpio_chip(gc); + struct cpm2_gpio32_chip *cpm2_gc = to_cpm2_gpio32_chip(mm_gc); struct cpm2_ioports __iomem *iop = mm_gc->regs; - u32 pin_mask; + unsigned long flags; + u32 pin_mask = 1 << (31 - gpio); - pin_mask = 1 << (31 - gpio); + spin_lock_irqsave(&cpm2_gc->lock, flags); clrbits32(&iop->dir, pin_mask); + spin_unlock_irqrestore(&cpm2_gc->lock, flags); + return 0; } |