As default, the DMA max segment size is set to 64k, and uvcvideo may overflow that size easily, resulting in a warning like: DMA-API: xhci_hcd 0000:00:14.0: mapping sg segment longer than device claims to support [len=98304] [max=65536] Explicitly set up the DMA max segment size for avoiding spurious kernel warnings. Signed-off-by: Takashi Iwai <tiwai@xxxxxxx> --- drivers/media/usb/uvc/uvc_video.c | 2 ++ 1 file changed, 2 insertions(+) diff --git a/drivers/media/usb/uvc/uvc_video.c b/drivers/media/usb/uvc/uvc_video.c index 1b4cc934109e..25aa6e6a6906 100644 --- a/drivers/media/usb/uvc/uvc_video.c +++ b/drivers/media/usb/uvc/uvc_video.c @@ -2160,6 +2160,8 @@ int uvc_video_init(struct uvc_streaming *stream) for_each_uvc_urb(uvc_urb, stream) INIT_WORK(&uvc_urb->work, uvc_video_copy_data_work); + dma_set_max_seg_size(uvc_stream_to_dmadev(stream), UINT_MAX); + return 0; } -- 2.35.3
