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ALSA: au88x0: avoid theoretical uninitialized access 

The latest gcc-7.0.1 snapshot points out that we if nr_ch is zero, we never
initialize some variables:

sound/pci/au88x0/au88x0_core.c: In function 'vortex_adb_allocroute':
sound/pci/au88x0/au88x0_core.c:2304:68: error: 'mix[0]' may be used uninitialized in this function [-Werror=maybe-uninitialized]
sound/pci/au88x0/au88x0_core.c:2305:58: error: 'src[0]' may be used uninitialized in this function [-Werror=maybe-uninitialized]

I assume this can never happen in practice, but adding a check here doesn't
hurt either and avoids the warning. The code has been unchanged since
the start of git history.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
This commit is contained in:
Arnd Bergmann 2017-03-23 16:15:55 +01:00 committed by Takashi Iwai
parent a16fbb85c7
commit 13f99ebdd6
1 changed files with 3 additions and 0 deletions
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3
sound/pci/au88x0/au88x0_core.c
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@ -2279,6 +2279,9 @@ vortex_adb_allocroute(vortex_t *vortex, int dma, int nr_ch, int dir,
} else {
int src[2], mix[2];
if (nr_ch < 1)
return -EINVAL;
/* Get SRC and MIXER hardware resources. */
for (i = 0; i < nr_ch; i++) {
if ((mix[i] =