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ALSA: hda/ca0132 - Avoid endless loop

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commit cb04fc3b6b076f67d228a0b7d096c69ad486c09c upstream.

Introduce a timeout to dspio_clear_response_queue() so that it won't
be caught in an endless loop even if the hardware doesn't respond
properly.

Fixes: a73d511c4867 ("ALSA: hda/ca0132: Add unsol handler for DSP and jack detection")
Cc: <stable@vger.kernel.org>
Link: https://lore.kernel.org/r/20191213085111.22855-3-tiwai@suse.de
Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Takashi Iwai 2019-12-13 09:51:10 +01:00 committed by Greg Kroah-Hartman
parent c06539b5d4
commit ea929ea14a
1 changed files with 3 additions and 2 deletions
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5
sound/pci/hda/patch_ca0132.c
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@ -1300,13 +1300,14 @@ struct scp_msg {
static void dspio_clear_response_queue(struct hda_codec *codec)
{
unsigned long timeout = jiffies + msecs_to_jiffies(1000);
unsigned int dummy = 0;
int status = -1;
int status;
/* clear all from the response queue */
do {
status = dspio_read(codec, &dummy);
} while (status == 0);
} while (status == 0 && time_before(jiffies, timeout));
}
static int dspio_get_response_data(struct hda_codec *codec)