On Thu, Dec 24, 2020 at 5:28 PM Linus Torvalds torvalds@linux-foundation.org wrote:
On Wed, Dec 23, 2020 at 6:29 PM Dave Airlie airlied@gmail.com wrote:
Xmas eve pull request present. Just some fixes that trickled in this past week. Mostly amdgpu fixes, with a dma-buf/mips build fix and some misc komeda fixes.
Well, I already pulled and pushed out my merge, but only noticed afterwards that clang complains about this, and I think it's a real bug:
drivers/gpu/drm/amd/amdgpu/../display/dc/dcn10/dcn10_mpc.c:475:6: warning: variable 'val' is used uninitialized whenever 'if' condition is false [-Wsometimes-uninitialized]
and it sure is true: the code literally does
uint32_t val; if (opp_id < MAX_OPP && REG(MUX[opp_id])) REG_GET(MUX[opp_id], MPC_OUT_MUX, &val); return val;so clearly 'val' isn't initialized if that if-statement isn't true.
I assume 'opp_id' is always presumed to be valid, but that code really is disgusting.
Just make it return 0 (or whatever) for invalid, possibly together with a WARN_ON_ONCE(). Ok?
Harry, Nick, Hersen,
Can you take a look?
Thanks,
Alex
Linus
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