2021-05-10 10:57:21

by Jiapeng Chong

Subject: [PATCH] ALSA: hda: generic: Remove redundant assignment to dac and dacs[i]

Variable dac and dacs[i] is set to zero, but this value is never read as
it is overwritten or not used later on, hence it is a redundant assignment
and can be removed.

Clean up the following clang-analyzer warning:

sound/pci/hda/hda_generic.c:1436:4: warning: Value stored to 'dac' is
never read [clang-analyzer-deadcode.DeadStores].

Reported-by: Abaci Robot <[email protected]>
Signed-off-by: Jiapeng Chong <[email protected]>
---
sound/pci/hda/hda_generic.c | 1 -
1 file changed, 1 deletion(-)

diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
index b638fc2..cce1bf7 100644
--- a/sound/pci/hda/hda_generic.c
+++ b/sound/pci/hda/hda_generic.c
@@ -1433,7 +1433,6 @@ static int try_assign_dacs(struct hda_codec *codec, int num_outs,
path = snd_hda_add_new_path(codec, dac, pin, 0);
}
if (!path) {
- dac = dacs[i] = 0;
badness += bad->no_dac;
} else {
/* print_nid_path(codec, "output", path); */
--
1.8.3.1

2021-05-10 12:09:10

by Amadeusz Sławiński

Subject: Re: [PATCH] ALSA: hda: generic: Remove redundant assignment to dac and dacs[i]

On 5/10/2021 12:41 PM, Jiapeng Chong wrote:
> Variable dac and dacs[i] is set to zero, but this value is never read as
> it is overwritten or not used later on, hence it is a redundant assignment
> and can be removed.
>
> Clean up the following clang-analyzer warning:
>
> sound/pci/hda/hda_generic.c:1436:4: warning: Value stored to 'dac' is
> never read [clang-analyzer-deadcode.DeadStores].
>
> Reported-by: Abaci Robot <[email protected]>
> Signed-off-by: Jiapeng Chong <[email protected]>
> ---
> sound/pci/hda/hda_generic.c | 1 -
> 1 file changed, 1 deletion(-)
>
> diff --git a/sound/pci/hda/hda_generic.c b/sound/pci/hda/hda_generic.c
> index b638fc2..cce1bf7 100644
> --- a/sound/pci/hda/hda_generic.c
> +++ b/sound/pci/hda/hda_generic.c
> @@ -1433,7 +1433,6 @@ static int try_assign_dacs(struct hda_codec *codec, int num_outs,
> path = snd_hda_add_new_path(codec, dac, pin, 0);
> }
> if (!path) {
> - dac = dacs[i] = 0;
> badness += bad->no_dac;
> } else {
> /* print_nid_path(codec, "output", path); */
>

Not entirely true... dacs is passed by pointer, so value assigned to it
can be used somewhere else.