Re: [PATCH RESEND 6/6] clk: s5p-g2d: Fix incorrect usage of IS_ERR_OR_NULL

From: Sylwester Nawrocki
Date: Wed Jan 02 2013 - 18:15:02 EST

On 01/02/2013 06:10 AM, Dan Carpenter wrote:
clk_get() returns NULL if CONFIG_HAVE_CLK is disabled.

It's not a problem for this driver, as it never dereferences what's
returned from clk_get(). It would have to include <plat/clock.h>, which
it doesn't and which would have clearly indicated abuse of the clock API.

Moreover, this driver now depends on architectures that select HAVE_CLK,
so it couldn't be build when CONFIG_HAVE_CLK is disabled.

I told Tony about this but everyone has been gone with end of year
holidays so it hasn't been addressed.

Tony, please fix it so people don't apply these patches until
clk_get() is updated to not return NULL. It sucks to have to revert

As explained by Russell many times, the clock API users should not care
whether the value returned from clk_get() is NULL or not. It should only
be tested with IS_ERR(). The patches look fine to me, no need to do


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