linux/drivers/usb/isp1760
Christoph Hellwig 7b81cb6bdd usb: add a HCD_DMA flag instead of guestimating DMA capabilities
The usb core is the only major place in the kernel that checks for
a non-NULL device dma_mask to see if a device is DMA capable.  This
is generally a bad idea, as all major busses always set up a DMA mask,
even if the device is not DMA capable - in fact bus layers like PCI
can't even know if a device is DMA capable at enumeration time.  This
leads to lots of workaround in HCD drivers, and also prevented us from
setting up a DMA mask for platform devices by default last time we
tried.

Replace this guess with an explicit HCD_DMA that is set by drivers that
appear to have DMA support.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20190816062435.881-4-hch@lst.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-08-21 10:03:35 -07:00
..
Kconfig USB: add missing SPDX lines to Kconfig and Makefiles 2019-01-22 09:08:17 +01:00
Makefile USB: add SPDX identifiers to all remaining Makefiles 2017-11-07 15:53:48 +01:00
isp1760-core.c usb: add a HCD_DMA flag instead of guestimating DMA capabilities 2019-08-21 10:03:35 -07:00
isp1760-core.h USB: isp1760: Remove redundant license text 2017-11-07 15:45:01 +01:00
isp1760-hcd.c usb: isp1760-hcd: Fix fall-through annotations 2019-05-01 18:13:52 +02:00
isp1760-hcd.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
isp1760-if.c usb: add a HCD_DMA flag instead of guestimating DMA capabilities 2019-08-21 10:03:35 -07:00
isp1760-regs.h USB: isp1760: Remove redundant license text 2017-11-07 15:45:01 +01:00
isp1760-udc.c usb: isp1760: Use kasprintf 2018-03-09 09:40:21 -08:00
isp1760-udc.h USB: isp1760: Remove redundant license text 2017-11-07 15:45:01 +01:00