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From: Takashi Iwai <tiwai@suse.de>
To: alsa-devel@alsa-project.org
Subject: [alsa-devel] [PATCH 2/3] ALSA: hda/ca0132 - Avoid endless loop
Date: Fri, 13 Dec 2019 09:51:10 +0100
Message-ID: <20191213085111.22855-3-tiwai@suse.de> (raw)
In-Reply-To: <20191213085111.22855-1-tiwai@suse.de>

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>
Signed-off-by: Takashi Iwai <tiwai@suse.de>
---
 sound/pci/hda/patch_ca0132.c | 5 +++--
 1 file changed, 3 insertions(+), 2 deletions(-)

diff --git a/sound/pci/hda/patch_ca0132.c b/sound/pci/hda/patch_ca0132.c
index c3d34ff3d9ec..8d0209fff8f5 100644
--- a/sound/pci/hda/patch_ca0132.c
+++ b/sound/pci/hda/patch_ca0132.c
@@ -1809,13 +1809,14 @@ 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)
-- 
2.16.4

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Thread overview: 4+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-12-13  8:51 [alsa-devel] [PATCH 0/3] ALSA: hda/ca0132 - Small fixes Takashi Iwai
2019-12-13  8:51 ` [alsa-devel] [PATCH 1/3] ALSA: hda/ca0132 - Keep power on during processing DSP response Takashi Iwai
2019-12-13  8:51 ` Takashi Iwai [this message]
2019-12-13  8:51 ` [alsa-devel] [PATCH 3/3] ALSA: hda/ca0132 - Fix work handling in delayed HP detection Takashi Iwai

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