On Fri, Mar 22, 2019 at 4:00 PM Takashi Iwai <tiwai@xxxxxxx> wrote:
>
> On Fri, 22 Mar 2019 15:06:28 +0100,
> Arnd Bergmann wrote:
> >
> > When CONFIG_PCI is disabled, clang gets confused about the
> > control flow of the switch() statement always ending up
> > in the default case, and warns:
> >
> > sound/pci/hda/patch_ca0132.c:7558:6: error: variable 'fw_entry' is used uninitialized whenever 'if' condition is false
> > [-Werror,-Wsometimes-uninitialized]
> > if (!spec->alt_firmware_present) {
> > ^~~~~~~~~~~~~~~~~~~~~~~~~~~
> > sound/pci/hda/patch_ca0132.c:7565:42: note: uninitialized use occurs here
> > dsp_os_image = (struct dsp_image_seg *)(fw_entry->data);
> > ^~~~~~~~
> > sound/pci/hda/patch_ca0132.c:7558:2: note: remove the 'if' if its condition is always true
> > if (!spec->alt_firmware_present) {
> > ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
> > sound/pci/hda/patch_ca0132.c:7521:33: note: initialize the variable 'fw_entry' to silence this warning
> > const struct firmware *fw_entry;
> > ^
> > = NULL
> >
> > Adding an explicit check for CONFIG_PCI avoids the issue.
> > Unfortunately this is not very intuitive here.
> >
> > Link: https://bugs.llvm.org/show_bug.cgi?id=41197#c1
> > Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
> > ---
> > Any suggestions for other workarounds appreciated. If you can think
> > of a better fix, please treat this as a reported-by:
>
> Can it be addressed by the code simplification like below, instead?
>
Yes, I confirmed this works as well, and it's probably more
obvious what's going on, so let's use your version.
Thanks,
Arnd
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