xiaomi-sm8450/android_kernel_xiaomi_sm8450
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

usb: add a hcd_uses_dma helper

Browse Source 
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>
This commit is contained in:
Christoph Hellwig
2019-08-11 10:05:16 +02:00
committed by Greg Kroah-Hartman
parent dd3ecf17ba
commit edfbcb321f
5 changed files with 10 additions and 11 deletions
Download Patch File Download Diff File Expand all files Collapse all files

3
include/linux/usb/hcd.h
View File

@@ -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);