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USB: introduce unmap_urb_setup_for_dma()

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Split unmap_urb_for_dma() to allow just the setup buffer
to be unmapped. This allows HCDs to use PIO for the setup
buffer if it is not suitable for DMA.

Signed-off-by: Martin Fuzzey <mfuzzey@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Martin Fuzzey 2010-10-01 00:21:55 +02:00 committed by Greg Kroah-Hartman
parent 7a7e789642
commit 1dae423dd9
2 changed files with 14 additions and 5 deletions
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18
drivers/usb/core/hcd.c
View file

@ -1263,10 +1263,8 @@ static void hcd_free_coherent(struct usb_bus *bus, dma_addr_t *dma_handle,
*dma_handle = 0;
}
void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
void unmap_urb_setup_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
enum dma_data_direction dir;
if (urb->transfer_flags & URB_SETUP_MAP_SINGLE)
dma_unmap_single(hcd->self.controller,
urb->setup_dma,
@ -1279,6 +1277,17 @@ void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
sizeof(struct usb_ctrlrequest),
DMA_TO_DEVICE);
/* Make it safe to call this routine more than once */
urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL);
}
EXPORT_SYMBOL_GPL(unmap_urb_setup_for_dma);
void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
{
enum dma_data_direction dir;
unmap_urb_setup_for_dma(hcd, urb);
dir = usb_urb_dir_in(urb) ? DMA_FROM_DEVICE : DMA_TO_DEVICE;
if (urb->transfer_flags & URB_DMA_MAP_SG)
dma_unmap_sg(hcd->self.controller,
@ -1303,8 +1312,7 @@ void unmap_urb_for_dma(struct usb_hcd *hcd, struct urb *urb)
dir);
/* Make it safe to call this routine more than once */
urb->transfer_flags &= ~(URB_SETUP_MAP_SINGLE | URB_SETUP_MAP_LOCAL |
URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
urb->transfer_flags &= ~(URB_DMA_MAP_SG | URB_DMA_MAP_PAGE |
URB_DMA_MAP_SINGLE | URB_MAP_LOCAL);
}
EXPORT_SYMBOL_GPL(unmap_urb_for_dma);

1
include/linux/usb/hcd.h
View file

@ -329,6 +329,7 @@ extern int usb_hcd_submit_urb(struct urb *urb, gfp_t mem_flags);
extern int usb_hcd_unlink_urb(struct urb *urb, int status);
extern void usb_hcd_giveback_urb(struct usb_hcd *hcd, struct urb *urb,
int status);
extern void unmap_urb_setup_for_dma(struct usb_hcd *, struct urb *);
extern void unmap_urb_for_dma(struct usb_hcd *, struct urb *);
extern void usb_hcd_flush_endpoint(struct usb_device *udev,
struct usb_host_endpoint *ep);