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authorLars-Peter Clausen <lars@metafoo.de>2013-03-09 08:16:47 +0000
committerWolfram Sang <wsa@the-dreams.de>2013-04-02 07:06:17 +0200
commit71546300c8684eb69286604c79624582c16f2f5b (patch)
tree3b8c56b7c5a4cda198604e32f066614e28b419fd /drivers/i2c/muxes
parentbf51a8c5e0b6133b929eb7d7456e99a605f8168c (diff)
downloadlinux-linaro-stable-71546300c8684eb69286604c79624582c16f2f5b.tar.gz
i2c: Make return type of i2c_del_adapter() void
i2c_del_adapter() is usually called from a drivers remove callback. The Linux device driver model does not allow the remove callback to fail and all resources allocated in the probe callback need to be freed, as well as all resources which have been provided to the rest of the kernel(for example a I2C adapter) need to be revoked. So any function revoking such resources isn't allowed to fail either. i2c_del_adapter() adheres to this requirement and will never fail. But i2c_del_adapter()'s return type is int, which may cause driver authors to think that it can fail. This led to code constructs like: ret = i2c_del_adapter(...); BUG_ON(ret); Since i2c_del_adapter() always returns 0 the BUG_ON is never hit and essentially becomes dead code, which means it can be removed. Making the return type of i2c_del_adapter() void makes it explicit that the function will never fail and should prevent constructs like the above from re-appearing in the kernel code. All callers of i2c_del_adapter() have already been updated in a previous patch to ignore the return value, so the conversion of the return type from int to void can be done without causing any build failures. Signed-off-by: Lars-Peter Clausen <lars@metafoo.de> Reviewed-by: Jean Delvare <khali@linux-fr.org> Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
Diffstat (limited to 'drivers/i2c/muxes')
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