[ALSA] intel8x0 - Fix Oops at kdump crash kernel

Fixed Oops at crash kernel from intel8x0 driver that is triggered
from interrupt handler.  Proper irqsave version seems needed for
kexec/kdump.

Signed-off-by: Takashi Iwai <tiwai@suse.de>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>

diff --git a/sound/pci/intel8x0.c b/sound/pci/intel8x0.c
index ff65e04..7cf2dcb 100644 (file)
--- a/sound/pci/intel8x0.c
+++ b/sound/pci/intel8x0.c
@@ -725,10 +725,11 @@ static void fill_nocache(void *buf, int size, int nocache)
 static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ichdev)
 {
        unsigned long port = ichdev->reg_offset;
+       unsigned long flags;
        int status, civ, i, step;
        int ack = 0;
 
-       spin_lock(&chip->reg_lock);
+       spin_lock_irqsave(&chip->reg_lock, flags);
        status = igetbyte(chip, port + ichdev->roff_sr);
        civ = igetbyte(chip, port + ICH_REG_OFF_CIV);
        if (!(status & ICH_BCIS)) {
@@ -768,7 +769,7 @@ static inline void snd_intel8x0_update(struct intel8x0 *chip, struct ichdev *ich
                        ack = 1;
                }
        }
-       spin_unlock(&chip->reg_lock);
+       spin_unlock_irqrestore(&chip->reg_lock, flags);
        if (ack && ichdev->substream) {
                snd_pcm_period_elapsed(ichdev->substream);
        }