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UPSTREAM: usb: gadget: uvc: improve sg exit condition

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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 <m.grzeschik@pengutronix.de>
Link: https://lore.kernel.org/r/20220402232744.3622565-4-m.grzeschik@pengutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

(cherry picked from commit aef1127988)
Bug: 242344221
Change-Id: I7eddc039ec0c54982fd6bae95af2f73f4ce04ef6
Signed-off-by: Avichal Rakesh <arakesh@google.com>
This commit is contained in:
Michael Grzeschik
2022-04-03 01:27:44 +02:00
committed by Todd Kjos
parent 474eabbb17
commit da9de7cbf5
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/function/uvc_video.c
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@@ -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;