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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> |
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| .. | ||
| isp1760-core.c | ||
| isp1760-core.h | ||
| isp1760-hcd.c | ||
| isp1760-hcd.h | ||
| isp1760-if.c | ||
| isp1760-regs.h | ||
| isp1760-udc.c | ||
| isp1760-udc.h | ||
| Kconfig | ||
| Makefile | ||