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authorClemens Ladisch <clemens@ladisch.de>2011-09-13 11:24:41 +0200
committerTakashi Iwai <tiwai@suse.de>2011-09-14 11:00:51 +0200
commitdba8b46992c55946d3b092934f581a343403118f (patch)
tree7ea5af971bc5cc8ecf4c8af1e0547fa11291ba86 /sound/isa/ad1816a
parent47124373b59e43fd07cbf7b44d9288f19c1d5a93 (diff)
ALSA: mpu401: clean up interrupt specification
The semantics of snd_mpu401_uart_new()'s interrupt parameters are somewhat counterintuitive: To prevent the function from allocating its own interrupt, either the irq number must be invalid, or the irq_flags parameter must be zero. At the same time, the irq parameter being invalid specifies that the mpu401 code has to work without an interrupt allocated by the caller. This implies that, if there is an interrupt and it is allocated by the caller, the irq parameter must be set to a valid-looking number which then isn't actually used. With the removal of IRQF_DISABLED, zero becomes a valid irq_flags value, which forces us to handle the parameters differently. This patch introduces a new flag MPU401_INFO_IRQ_HOOK for when the device interrupt is handled by the caller, and makes the allocation of the interrupt to depend only on the irq parameter. As suggested by Takashi, the irq_flags parameter was dropped because, when used, it had the constant value IRQF_DISABLED. Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Takashi Iwai <tiwai@suse.de>
Diffstat (limited to 'sound/isa/ad1816a')
-rw-r--r--sound/isa/ad1816a/ad1816a.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/sound/isa/ad1816a/ad1816a.c b/sound/isa/ad1816a/ad1816a.c
index 3cb75bc97699..a87a2b566e19 100644
--- a/sound/isa/ad1816a/ad1816a.c
+++ b/sound/isa/ad1816a/ad1816a.c
@@ -204,7 +204,7 @@ static int __devinit snd_card_ad1816a_probe(int dev, struct pnp_card_link *pcard
if (mpu_port[dev] > 0) {
if (snd_mpu401_uart_new(card, 0, MPU401_HW_MPU401,
- mpu_port[dev], 0, mpu_irq[dev], IRQF_DISABLED,
+ mpu_port[dev], 0, mpu_irq[dev],
NULL) < 0)
printk(KERN_ERR PFX "no MPU-401 device at 0x%lx.\n", mpu_port[dev]);
}