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staging: comedi: adl_pci9118: DMA requires an interrupt 

In order for DMA to work we also need an interrupt. Refactor the code
so that the DMA allocation is only done if the interrupt is available.

Signed-off-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Reviewed-by: Ian Abbott <abbotti@mev.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
H Hartley Sweeten 2014-09-09 13:05:27 -07:00 committed by Greg Kroah-Hartman
parent b9ca5508bc
commit 6cf6b36768
1 changed files with 10 additions and 9 deletions
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15
drivers/staging/comedi/drivers/adl_pci9118.c
View File

@ -1775,8 +1775,16 @@ static int pci9118_common_attach(struct comedi_device *dev, int disable_irq,
pci9118_reset(dev);
if (!disable_irq && pcidev->irq) {
ret = request_irq(pcidev->irq, pci9118_interrupt, IRQF_SHARED,
dev->board_name, dev);
if (ret == 0) {
dev->irq = pcidev->irq;
if (master)
pci9118_alloc_dma(dev);
}
}
if (ext_mux > 0) {
if (ext_mux > 256)
@ -1804,13 +1812,6 @@ static int pci9118_common_attach(struct comedi_device *dev, int disable_irq,
pci_write_config_word(pcidev, PCI_COMMAND, u16w | 64);
/* Enable parity check for parity error */
if (!disable_irq && pcidev->irq) {
ret = request_irq(pcidev->irq, pci9118_interrupt, IRQF_SHARED,
dev->board_name, dev);
if (ret == 0)
dev->irq = pcidev->irq;
}
ret = comedi_alloc_subdevices(dev, 4);
if (ret)
return ret;