On Thu, Oct 13, 2016 at 07:18:37PM +0100, Al Viro wrote: > On Thu, Oct 13, 2016 at 11:09:16AM -0700, Tai Nguyen wrote: > > In acpi_get_pmu_hw_inf we pass the address of a local variable to IS_ERR(), > > which doesn't make sense, as the pointer must be a real, valid pointer. > > This doesn't cause a functional problem, as IS_ERR() will evaluate as > > false, but the check is bogus and causes static checkers to complain. > > ... unless the test is actually a misspelled IS_ERR(res) and the current > code is broken by effectively skipping it.
Sure. In this case, res is a struct resource, so IS_ERR(res) is also bogus. None of the pointer fields in struct resource are ever set to an ERR_PTR value, so nothing in res is worth checking. Nothing else in the function prior to this would be an ERR_PTR value either. I believe this case was copy-paste and a thinko. There's some other error handling in the file that does validly have to handle an ERR_PTR value. Thanks, Mark.