| From | Greg Kroah-Hartman <> | Subject | [PATCH 4.19 025/219] ALSA: hda/ca0132 - Avoid endless loop | Date | Sun, 29 Dec 2019 18:17:07 +0100 |
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From: Takashi Iwai <tiwai@suse.de>
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>
--- sound/pci/hda/patch_ca0132.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-)
--- a/sound/pci/hda/patch_ca0132.c +++ b/sound/pci/hda/patch_ca0132.c @@ -1683,13 +1683,14 @@ 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)
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