Hi !
maestro.c:3537 takes care about volume button pressing when requesting irq
(maestro_probe) :
if((ret=request_irq(card->irq, ess_interrupt, SA_SHIRQ, card_names[card_type], card)))
{
<snipped>
}
/* Turn on hardware volume control interrupt.
This has to come after we grab the IRQ above,
or a crash will result on installation if a button has been pressed,
because in that case we'll get an immediate interrupt. */
n = inw(iobase+0x18);
n|=(1<<6);
outw(n, iobase+0x18);
but not when unloading module : in fact, this bit is never cleared.
Indeed, loading the module, unloading it, and pressing a volume button
immediately crashes.
This cures the problem :
diff -urN linux-2.4.18/drivers/sound/maestro.c linux-2.4.18-cor/drivers/sound/maestro.c
--- linux-2.4.18/drivers/sound/maestro.c Sun Jun 30 22:00:22 2002
+++ linux-2.4.18-cor/drivers/sound/maestro.c Sun Jun 30 22:02:11 2002
@@ -3569,9 +3569,18 @@
static void maestro_remove(struct pci_dev *pcidev) {
struct ess_card *card = pci_get_drvdata(pcidev);
int i;
+ u32 n;
/* XXX maybe should force stop bob, but should be all
stopped by _release by now */
+
+ /* Turn off hardware volume control interrupt.
+ This has to come before we leave the IRQ below,
+ or a crash results if a button is pressed ! */
+ n = inw(card->iobase+0x18);
+ n&=~(1<<6);
+ outw(n, card->iobase+0x18);
+
free_irq(card->irq, card);
unregister_sound_mixer(card->dev_mixer);
for(i=0;i<NR_DSPS;i++)
This patch also apply to 2.5 series (tested on 2.5.24) in linux/sound/oss
by using -p3.
Best regards,
Samuel Thibault