On 12.9.2023 2.41, Wesley Cheng wrote:
As mentioned in: commit 474ed23a6257 ("xhci: align the last trb before link if it is easily splittable.")
A bounce buffer is utilized for ensuring that transfers that span across ring segments are aligned to the EP's max packet size. However, the device that is used to map the DMA buffer to is currently using the XHCI HCD, which does not carry any DMA operations in certain configrations. Migration to using the sysdev entry was introduced for DWC3 based implementations where the IOMMU operations are present.
Replace the reference to the controller device to sysdev instead. This allows the bounce buffer to be properly mapped to any implementations that have an IOMMU involved.
cc: stable@vger.kernel.org Fixes: 4c39d4b949d3 ("usb: xhci: use bus->sysdev for DMA configuration") Signed-off-by: Wesley Cheng quic_wcheng@quicinc.com
Thanks, adding to queue
-Mathias