ALSA: hda - Add a warning if pending IRQ is found

The pending IRQ handling is a very hackish workaround and should be
avoided as much as possible via a larger bdl_pos_adj option value.
Put a warning message if this situation occurs so that the user may have
a chance to notice that something is wrong.

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

1 files changed, 9 insertions, 0 deletions

diff --git a/sound/pci/hda/hda_intel.c b/sound/pci/hda/hda_intel.c
index 9b2dc0669b94..ec4ae2d94000 100644
--- a/sound/pci/hda/hda_intel.c
+++ b/sound/pci/hda/hda_intel.c
@@ -374,6 +374,7 @@ struct azx {
         unsigned int single_cmd :1;
         unsigned int polling_mode :1;
         unsigned int msi :1;
+        unsigned int irq_pending_warned :1;
 
         /* for debugging */
         unsigned int last_cmd;  /* last issued command (to sync) */
@@ -1562,6 +1563,14 @@ static void azx_irq_pending_work(struct work_struct *work)
         struct azx *chip = container_of(work, struct azx, irq_pending_work);
         int i, pending;
 
+        if (!chip->irq_pending_warned) {
+                printk(KERN_WARNING
+                       "hda-intel: IRQ timing workaround is activated "
+                       "for card #%d. Suggest a bigger bdl_pos_adj.\n",
+                       chip->card->number);
+                chip->irq_pending_warned = 1;
+        }
+
         for (;;) {
                 pending = 0;
                 spin_lock_irq(&chip->reg_lock);