From: Michael Grzeschik Date: Sat, 2 Apr 2022 23:27:44 +0000 (+0200) Subject: usb: gadget: uvc: improve sg exit condition X-Git-Tag: v6.6.17~7346^2~135 X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=aef11279888c00e1841a3533a35d279285af3a51;p=platform%2Fkernel%2Flinux-rpi.git usb: gadget: uvc: improve sg exit condition The exit condition to quit iterating over the sg_list, while encoding the sg entries, has to consider the case that the dma_len of the entry could be zero. This patch takes this condition to account. Signed-off-by: Michael Grzeschik Link: https://lore.kernel.org/r/20220402232744.3622565-4-m.grzeschik@pengutronix.de Signed-off-by: Greg Kroah-Hartman --- diff --git a/drivers/usb/gadget/function/uvc_video.c b/drivers/usb/gadget/function/uvc_video.c index ceeabc4..a9bb455 100644 --- a/drivers/usb/gadget/function/uvc_video.c +++ b/drivers/usb/gadget/function/uvc_video.c @@ -155,7 +155,7 @@ uvc_video_encode_isoc_sg(struct usb_request *req, struct uvc_video *video, sg = sg_next(sg); for_each_sg(sg, iter, ureq->sgt.nents - 1, i) { - if (!len || !buf->sg) + if (!len || !buf->sg || !sg_dma_len(buf->sg)) break; sg_left = sg_dma_len(buf->sg) - buf->offset;