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DMA-API: usb: ohci-sa1111: add a note about DMA masks

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Add a comment to explain why this driver doesn't call any of the DMA
API dma_set_mask() functions.

Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>
This commit is contained in:
Russell King 2013-06-27 11:10:40 +01:00
parent e0a8ba2581
commit 4ffb4318b0
1 changed files with 6 additions and 0 deletions
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6
drivers/usb/host/ohci-sa1111.c
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@ -185,6 +185,12 @@ static int ohci_hcd_sa1111_probe(struct sa1111_dev *dev)
if (usb_disabled())
return -ENODEV;
/*
* We don't call dma_set_mask_and_coherent() here because the
* DMA mask has already been appropraitely setup by the core
* SA-1111 bus code (which includes bug workarounds.)
*/
hcd = usb_create_hcd(&ohci_sa1111_hc_driver, &dev->dev, "sa1111");
if (!hcd)
return -ENOMEM;