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authorRabin Vincent <rabin.vincent@stericsson.com>2012-03-08 14:01:46 +0100
committerSamuel Ortiz <sameo@linux.intel.com>2012-03-16 19:43:36 +0100
commit392cbd1e608ba79bd2da652eb3a28d841e51eaee (patch)
tree2c6b20c16188fd1b4ecf25ebf7df02b2c61ed488 /drivers/mfd/ab8500-core.c
parentbd155d2c3c8b04d66f7890dbd9539c37e9dea02b (diff)
downloadop-kernel-dev-392cbd1e608ba79bd2da652eb3a28d841e51eaee.zip
op-kernel-dev-392cbd1e608ba79bd2da652eb3a28d841e51eaee.tar.gz
mfd: Don't use mutex_lock_interruptible in ab8500-core
This disadvantage of having it interruptible is that it would appear to work OK in most situations, but in the rare case that this call does fail, it can lead to misconfiguration of the AB, such as a regulator not being turned off and leading to a platform power consumption increase. There's no real benefit to having this interruptible. Make it a plain mutex_lock. The non-interruptability matches other low-level I/O functions such as SPI and I2C. Signed-off-by: Rabin Vincent <rabin.vincent@stericsson.com> Signed-off-by: Linus Walleij <linus.walleij@linaro.org> Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
Diffstat (limited to 'drivers/mfd/ab8500-core.c')
-rw-r--r--drivers/mfd/ab8500-core.c12
1 files changed, 3 insertions, 9 deletions
diff --git a/drivers/mfd/ab8500-core.c b/drivers/mfd/ab8500-core.c
index 15a18fe..f134a6c 100644
--- a/drivers/mfd/ab8500-core.c
+++ b/drivers/mfd/ab8500-core.c
@@ -147,9 +147,7 @@ static int set_register_interruptible(struct ab8500 *ab8500, u8 bank,
dev_vdbg(ab8500->dev, "wr: addr %#x <= %#x\n", addr, data);
- ret = mutex_lock_interruptible(&ab8500->lock);
- if (ret)
- return ret;
+ mutex_lock(&ab8500->lock);
ret = ab8500->write(ab8500, addr, data);
if (ret < 0)
@@ -176,9 +174,7 @@ static int get_register_interruptible(struct ab8500 *ab8500, u8 bank,
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
- ret = mutex_lock_interruptible(&ab8500->lock);
- if (ret)
- return ret;
+ mutex_lock(&ab8500->lock);
ret = ab8500->read(ab8500, addr);
if (ret < 0)
@@ -210,9 +206,7 @@ static int mask_and_set_register_interruptible(struct ab8500 *ab8500, u8 bank,
* bank on higher 8 bits and reg in lower */
u16 addr = ((u16)bank) << 8 | reg;
- ret = mutex_lock_interruptible(&ab8500->lock);
- if (ret)
- return ret;
+ mutex_lock(&ab8500->lock);
ret = ab8500->read(ab8500, addr);
if (ret < 0) {
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