diff options
| author | Frank Schaefer <fschaefer.oss@googlemail.com> | 2013-03-27 16:07:41 -0300 |
|---|---|---|
| committer | Mauro Carvalho Chehab <mchehab@redhat.com> | 2013-03-28 18:39:44 -0300 |
| commit | 72cc9ba39a046132a638888eaa5a14baf55621b2 (patch) | |
| tree | f1ce5f038ea212167e46009d5d78cf1f291df411 /drivers/media/usb/em28xx | |
| parent | b41869711586b047c18435ba84baf334918bae01 (diff) | |
[media] em28xx: ignore isoc DVB USB endpoints with wMaxPacketSize = 0 bytes for all alt settings
Some devices without DVB support (such as the "Terratec Grabby" and
"Easycap DC-60") provide isochronous DVB USB endpoints with wMaxPacketSize set
to 0 bytes for all alt settings.
Ignore these endpoints and avoid registering a DVB device node and loading the
DVB driver extension.
Signed-off-by: Frank Schäfer <fschaefer.oss@googlemail.com>
Tested-by: Timo Teräs <timo.teras@iki.fi>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
Diffstat (limited to 'drivers/media/usb/em28xx')
| -rw-r--r-- | drivers/media/usb/em28xx/em28xx-cards.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c index 54e0362d8e3d..096206334134 100644 --- a/drivers/media/usb/em28xx/em28xx-cards.c +++ b/drivers/media/usb/em28xx/em28xx-cards.c @@ -3357,14 +3357,15 @@ static int em28xx_usb_probe(struct usb_interface *interface, dev->analog_ep_bulk = e->bEndpointAddress; } else { - has_dvb = true; if (usb_endpoint_xfer_isoc(e)) { dev->dvb_ep_isoc = e->bEndpointAddress; if (size > dev->dvb_max_pkt_size_isoc) { + has_dvb = true; /* see NOTE (~) */ dev->dvb_max_pkt_size_isoc = size; dev->dvb_alt_isoc = i; } } else { + has_dvb = true; dev->dvb_ep_bulk = e->bEndpointAddress; } } @@ -3391,6 +3392,12 @@ static int em28xx_usb_probe(struct usb_interface *interface, * so far. But there might be devices for which this * logic is not sufficient... */ + /* + * NOTE (~): some manufacturers (e.g. Terratec) disable + * endpoints by setting wMaxPacketSize to 0 bytes for + * all alt settings. So far, we've seen this for + * DVB isoc endpoints only. + */ } } |