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ALSA: hda: check make_exec_verb() return value
If given a -1 cmd parameter then make_exec_verb() returns -1 without setting the res output value. Prior to this change snd_hda_codec_read() assumed that make_exec_verb() unconditionally set res regardless of the cmd value. This change explicitly checks the make_exec_verb() return value before consuming the potentially unset res value. Signed-off-by: Greg Thelen <gthelen@google.com> Signed-off-by: Takashi Iwai <tiwai@suse.de>
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@ -243,7 +243,8 @@ unsigned int snd_hda_codec_read(struct hda_codec *codec, hda_nid_t nid,
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{
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unsigned cmd = make_codec_cmd(codec, nid, direct, verb, parm);
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unsigned int res;
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codec_exec_verb(codec, cmd, &res);
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if (codec_exec_verb(codec, cmd, &res))
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return -1;
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return res;
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}
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EXPORT_SYMBOL_HDA(snd_hda_codec_read);
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