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[media] gspca - main: Add endpoint direction test in alt_xfer

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This patch fixes a bug in gspca, more precisely in alt_xfer().

This function looks for an input transfer endpoint in an alternate setting.
By default it returns the first endpoint corresponding to the transfer type
indicated in parameter.
But with some USB devices, the first endpoint corresponding to the transfer
type is not always an INPUT endpoint but an OUTPUT one.

This patch adds the endpoint direction test to be sure to return an INPUT endpoint

Signed-off-by: Patrice CHOTARD <patricechotard@free.fr>
Signed-off-by: Jean-François Moine <moinejf@free.fr>
Signed-off-by: Mauro Carvalho Chehab <mchehab@redhat.com>
This commit is contained in:
Patrice Chotard 2011-03-21 16:58:56 -03:00 committed by Mauro Carvalho Chehab
parent 8e3c08bb41
commit 7106225a9e
1 changed files with 2 additions and 1 deletions
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3
drivers/media/video/gspca/gspca.c
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@ -630,7 +630,8 @@ static struct usb_host_endpoint *alt_xfer(struct usb_host_interface *alt,
ep = &alt->endpoint[i];
attr = ep->desc.bmAttributes & USB_ENDPOINT_XFERTYPE_MASK;
if (attr == xfer
&& ep->desc.wMaxPacketSize != 0)
&& ep->desc.wMaxPacketSize != 0
&& usb_endpoint_dir_in(&ep->desc))
return ep;
}
return NULL;