[ALSA] cs4236-irq-handling-fix.patch
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>
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5ac0fab95c
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375389288a
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@ -349,8 +349,7 @@ static int __devinit snd_card_cs4236_pnp(int dev, struct snd_card_cs4236 *acard,
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pnp_init_resource_table(cfg);
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if (mpu_port[dev] != SNDRV_AUTO_PORT)
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pnp_resource_change(&cfg->port_resource[0], mpu_port[dev], 2);
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if (mpu_irq[dev] != SNDRV_AUTO_IRQ && mpu_irq[dev] >= 0 &&
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pnp_irq_valid(pdev, 0))
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if (mpu_irq[dev] != SNDRV_AUTO_IRQ && mpu_irq[dev] >= 0)
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pnp_resource_change(&cfg->irq_resource[0], mpu_irq[dev], 1);
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err = pnp_manual_config_dev(pdev, cfg, 0);
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if (err < 0)
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