From 1f42df0db04356ff9384514e1ec027df9ce3d132 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Jean-Fran=C3=A7ois=20Moine?= Date: Mon, 19 Mar 2012 04:22:44 -0300 Subject: [media] gspca - sn9c20x: Fix loss of frame start MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit The frame header was checked on packets of size 64 bytes only, while the webcams may put a frame header at the beginning of bigger packets. Signed-off-by: Jean-François Moine Signed-off-by: Mauro Carvalho Chehab --- drivers/media/video/gspca/sn9c20x.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) (limited to 'drivers/media') diff --git a/drivers/media/video/gspca/sn9c20x.c b/drivers/media/video/gspca/sn9c20x.c index 9e198b45c3c8..e54bf54b3901 100644 --- a/drivers/media/video/gspca/sn9c20x.c +++ b/drivers/media/video/gspca/sn9c20x.c @@ -2457,7 +2457,7 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, int avg_lum; static u8 frame_header[] = {0xff, 0xff, 0x00, 0xc4, 0xc4, 0x96}; - if (len == 64 && memcmp(data, frame_header, 6) == 0) { + if (len >= 64 && memcmp(data, frame_header, 6) == 0) { avg_lum = ((data[35] >> 2) & 3) | (data[20] << 2) | (data[19] << 10); @@ -2485,7 +2485,10 @@ static void sd_pkt_scan(struct gspca_dev *gspca_dev, avg_lum >>= 9; atomic_set(&sd->avg_lum, avg_lum); gspca_frame_add(gspca_dev, LAST_PACKET, NULL, 0); - return; + len -= 64; + if (len == 0) + return; + data += 64; } if (gspca_dev->last_packet_type == LAST_PACKET) { if (gspca_dev->cam.cam_mode[(int) gspca_dev->curr_mode].priv -- cgit v1.2.2