[PATCH 5.4 004/348] ALSA: intel8x0: Fix breakage at ac97 clock measurement

[Greg Kroah-Hartman]

From: Takashi Iwai <tiwai@xxxxxxx>

commit 24d1e49415be546470b20429d748e240d0518b7e upstream.

The recent workaround for the wild interrupts in commit c1f0616124c4
("ALSA: intel8x0: Don't update period unless prepared") leaded to a
regression, causing the interrupt storm during ac97 clock measurement
at the driver probe.  We need to handle the interrupt while the clock
measurement as well as the proper PCM streams.

Fixes: c1f0616124c4 ("ALSA: intel8x0: Don't update period unless prepared")
Reported-and-tested-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Tested-by: Sergey Senozhatsky <senozhatsky@xxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/CAMo8BfKKMQkcsbOQaeEjq_FsJhdK=fn598dvh7YOcZshUSOH=g@xxxxxxxxxxxxxx
Link: https://lore.kernel.org/r/20210708090738.1569-1-tiwai@xxxxxxx
Signed-off-by: Takashi Iwai <tiwai@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>

---
 sound/pci/intel8x0.c |    2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -715,7 +715,7 @@ static inline void snd_intel8x0_update(s
 	int status, civ, i, step;
 	int ack = 0;
 
-	if (!ichdev->prepared || ichdev->suspended)
+	if (!(ichdev->prepared || chip->in_measurement) || ichdev->suspended)
 		return;
 
 	spin_lock_irqsave(&chip->reg_lock, flags);