diff options
| author | Christoph Hellwig <hch@lst.de> | 2019-08-11 10:05:16 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2019-08-15 15:18:05 +0200 |
| commit | edfbcb321faf07ca970e4191abe061deeb7d3788 (patch) | |
| tree | 66aea00d395ce3865017ed0142933e539d2e502c /include/linux/usb/hcd.h | |
| parent | dd3ecf17ba70a70d2c9ef9ba725281b84f8eef12 (diff) | |
usb: add a hcd_uses_dma helper
The USB buffer allocation code is the only place in the usb core (and in
fact the whole kernel) that uses is_device_dma_capable, while the URB
mapping code uses the uses_dma flag in struct usb_bus. Switch the buffer
allocation to use the uses_dma flag used by the rest of the USB code,
and create a helper in hcd.h that checks this flag as well as the
CONFIG_HAS_DMA to simplify the caller a bit.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190811080520.21712-3-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'include/linux/usb/hcd.h')
| -rw-r--r-- | include/linux/usb/hcd.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/usb/hcd.h b/include/linux/usb/hcd.h index bab27ccc8ff5..a20e7815d814 100644 --- a/include/linux/usb/hcd.h +++ b/include/linux/usb/hcd.h @@ -422,6 +422,9 @@ static inline bool hcd_periodic_completion_in_progress(struct usb_hcd *hcd, return hcd->high_prio_bh.completing_ep == ep; } +#define hcd_uses_dma(hcd) \ + (IS_ENABLED(CONFIG_HAS_DMA) && (hcd)->self.uses_dma) + extern int usb_hcd_link_urb_to_ep(struct usb_hcd *hcd, struct urb *urb); extern int usb_hcd_check_unlink_urb(struct usb_hcd *hcd, struct urb *urb, int status); |