From: Devin Heitmueller Date: Sun, 13 Jun 2010 20:00:23 +0000 (-0300) Subject: V4L/DVB: Fix case where fields were not at the correct start location X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=2584bc4337855382d23b4abfc2e2492df6fdeb41;p=linux-beck.git V4L/DVB: Fix case where fields were not at the correct start location This patch address an arithmetic error for the case where the only remaining content in the USB packet was the "225Axxxx" start of active video. In cases where that happened to be at the end of the frame, we would inject it into the videobuf (which is incorrect). This caused fields to be intermittently rendered off by two pixels. Thanks to Eugeniy Meshcheryakov for bringing this issue to my attention Signed-off-by: Devin Heitmueller Signed-off-by: Mauro Carvalho Chehab --- diff --git a/drivers/media/video/em28xx/em28xx-video.c b/drivers/media/video/em28xx/em28xx-video.c index 20090e34173a..7b9ec6e493e4 100644 --- a/drivers/media/video/em28xx/em28xx-video.c +++ b/drivers/media/video/em28xx/em28xx-video.c @@ -654,12 +654,12 @@ static inline int em28xx_isoc_copy_vbi(struct em28xx *dev, struct urb *urb) } if (buf != NULL && dev->capture_type == 2) { - if (len > 4 && p[0] == 0x88 && p[1] == 0x88 && + if (len >= 4 && p[0] == 0x88 && p[1] == 0x88 && p[2] == 0x88 && p[3] == 0x88) { p += 4; len -= 4; } - if (len > 4 && p[0] == 0x22 && p[1] == 0x5a) { + if (len >= 4 && p[0] == 0x22 && p[1] == 0x5a) { em28xx_isocdbg("Video frame %d, len=%i, %s\n", p[2], len, (p[2] & 1) ? "odd" : "even");