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mfd: Check for twl4030-madc NULL pointer 

If the twl4030-madc device wasn't registered, and another device, such
as twl4030-madc-hwmon, calls twl4030_madc_conversion() a NULL pointer is
dereferenced.

Signed-off-by: Kyle Manna <kyle@kylemanna.com>
Signed-off-by: Samuel Ortiz <sameo@linux.intel.com>
This commit is contained in:
Kyle Manna 2011-08-11 22:33:14 -05:00 committed by Samuel Ortiz
parent 66cc5b8e50
commit d0e84caeb4
1 changed files with 2 additions and 1 deletions
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3
drivers/mfd/twl4030-madc.c
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@ -510,8 +510,9 @@ int twl4030_madc_conversion(struct twl4030_madc_request *req)
u8 ch_msb, ch_lsb;
int ret;
if (!req)
if (!req || !twl4030_madc)
return -EINVAL;
mutex_lock(&twl4030_madc->lock);
if (req->method < TWL4030_MADC_RT || req->method > TWL4030_MADC_SW2) {
ret = -EINVAL;