https://bugzilla.kernel.org/show_bug.cgi?id=215890 Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) changed: What |Removed |Added ---------------------------------------------------------------------------- CC| |mathias.nyman@linux.intel.c | |om --- Comment #11 from Mathias Nyman (mathias.nyman@xxxxxxxxxxxxxxx) --- Could it be that bcm5974 driver just forgot to set the URB_NO_TRANSFER_DMA_MAP flag in urb transfer_flags? If the usb driver does the allocation and dma mapping, and sets urb->transfer_dma then it should set that flag. Otherwise usbcore will map the DMA address. Documentation/driver-api/usb/dma.rst: - URBs have an additional "transfer_dma" field, as well as a transfer_flags bit saying if it's valid. (Control requests also have "setup_dma", but drivers must not use it.) - "usbcore" will map this DMA address, if a DMA-aware driver didn't do it first and set ``URB_NO_TRANSFER_DMA_MAP``. HCDs don't manage dma mappings for URBs. -- You may reply to this email to add a comment. You are receiving this mail because: You are watching the assignee of the bug.
