Re: [PATCH] ALSA: hda: cs35l56: Propagate ASP TX source control errors

["Cássio Gabriel Monteiro Pires" <cassiogabrielcontato@gmail.com>]

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On 4/23/26 10:32, Richard Fitzgerald wrote:
> On 23/04/2026 2:11 pm, Cássio Gabriel wrote:
>> cs35l56_hda_mixer_get() ignores regmap_read() and
>> cs35l56_hda_mixer_put() ignores regmap_update_bits_check().
>>
>> This makes the ASP TX source controls report success when a regmap
>> access fails. The write path returns no change instead of an error,
>> and the read path continues after a failed read instead of aborting
>> the control callback.
> 
> Are you seeing a problem on hardware? Or is this a static analysis
> warning?

This was found by code inspection, then checked with a focused
Coccinelle rule (I do not have the hardware to check it).

Rule:

@ignored_regmap_read@
position p;
expression map, reg, val;
@@

regmap_read@p(map, reg, val);

@script:python depends on ignored_regmap_read@
p << ignored_regmap_read.p;
@@

coccilib.report.print_report(p[0], "ignored regmap_read() return value")

@ignored_regmap_update_bits_check@
position p;
expression map, reg, mask, val, change;
@@

regmap_update_bits_check@p(map, reg, mask, val, change);

@script:python depends on ignored_regmap_update_bits_check@
p << ignored_regmap_update_bits_check.p;
@@

coccilib.report.print_report(p[0], "ignored regmap_update_bits_check() return value")



Before the patch:
$ spatch --very-quiet --cocci-file /tmp/ignored-regmap-access.cocci /tmp/cs35l56_hda-before.c
/tmp/cs35l56_hda-before.c:187:1-12: ignored regmap_read() return value
/tmp/cs35l56_hda-before.c:212:1-25: ignored regmap_update_bits_check() return value

After the patch:
$ spatch --very-quiet --cocci-file /tmp/ignored-regmap-access.cocci sound/hda/codecs/side-
codecs/cs35l56_hda.c

No matches.

-- 
Thanks,
Cássio


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