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@xxxxxxxxxxxxxx>
Cc: stable@xxxxxxxxxx
---
drivers/media/usb/em28xx/em28xx-cards.c | 9 ++++++++-
1 Datei geändert, 8 Zeilen hinzugefügt(+), 1 Zeile entfernt(-)
diff --git a/drivers/media/usb/em28xx/em28xx-cards.c b/drivers/media/usb/em28xx/em28xx-cards.c
index 54e0362..94536ee 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.
+ */
}
}
--
1.7.10.4
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