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staging: comedi: adl_pci9118: don't allocate 2nd DMA buffer on failure 

`pci9118_alloc_dma()` tries to allocate two DMA buffers but may allocate
a single buffer or none at all.  If it fails to allocate the first
buffer, it still tries to allocate the second buffer, even though it
won't be used.  Change it to not bother trying to allocate the second
buffer if the first one fails.

Signed-off-by: Ian Abbott <abbotti@mev.co.uk>
Reviewed-by: H Hartley Sweeten <hsweeten@visionengravers.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Ian Abbott 2014-09-12 10:04:42 +01:00 committed by Greg Kroah-Hartman
parent 27f5a85fb5
commit d5733baf23
1 changed files with 9 additions and 9 deletions
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18
drivers/staging/comedi/drivers/adl_pci9118.c
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@ -1489,16 +1489,16 @@ static void pci9118_alloc_dma(struct comedi_device *dev)
if (dmabuf->virt)
break;
}
if (dmabuf->virt) {
dmabuf->pages = pages;
dmabuf->size = PAGE_SIZE * pages;
dmabuf->hw = virt_to_bus((void *)dmabuf->virt);
if (!dmabuf->virt)
break;
dmabuf->pages = pages;
dmabuf->size = PAGE_SIZE * pages;
dmabuf->hw = virt_to_bus((void *)dmabuf->virt);
if (i == 0)
devpriv->master = 1;
if (i == 1)
devpriv->dma_doublebuf = 1;
}
if (i == 0)
devpriv->master = 1;
if (i == 1)
devpriv->dma_doublebuf = 1;
}
}