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[ALSA] cs4236-irq-handling-fix.patch

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CS4236+ driver
Background: The card/chipset supports an external MIDI interrupt.  By
default, this interrupt isn't used (because the isapnp mechanism chooses a
configuration without an assigned interrupt).  If the user wishes to
explicitly select an interrupt via the mpu_irq parameter for such a
configured device, it doesn't work: The driver always shows:

isapnp MPU: port=0x330, irq=-1

(note the 'irq=-1')

Problem: The driver only allows to set the irq if pnp_irq_valid returns
true for this particular pnp device.  This, however, is only true if an
interrupt has already been assigned (pnp_valid_irq returns true if the flag
IORESOURCE_IRQ is set and IORESOURCE_UNSET is not set).  If no interrupt
has been assigned so far, IORESOURCE_UNSET is set and pnp_irq_valid returns
false, thereby inhibiting the selection of a valid irq.

Solution: Don't check for a valid (= already assigned) irq at the point of
calling pnp_resource_change.

Tested successfully on Linux 2.6.11.

Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Jaroslav Kysela <perex@suse.cz>
This commit is contained in:
Christoph Schulz 2005-06-03 08:28:31 +02:00 committed by Jaroslav Kysela
parent 5ac0fab95c
commit 375389288a
1 changed files with 1 additions and 2 deletions
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3
sound/isa/cs423x/cs4236.c
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@ -349,8 +349,7 @@ static int __devinit snd_card_cs4236_pnp(int dev, struct snd_card_cs4236 *acard,
pnp_init_resource_table(cfg);
if (mpu_port[dev] != SNDRV_AUTO_PORT)
pnp_resource_change(&cfg->port_resource[0], mpu_port[dev], 2);
if (mpu_irq[dev] != SNDRV_AUTO_IRQ && mpu_irq[dev] >= 0 &&
pnp_irq_valid(pdev, 0))
if (mpu_irq[dev] != SNDRV_AUTO_IRQ && mpu_irq[dev] >= 0)
pnp_resource_change(&cfg->irq_resource[0], mpu_irq[dev], 1);
err = pnp_manual_config_dev(pdev, cfg, 0);
if (err < 0)