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usb: gadget: composite: correctly initialize ep->maxpacket

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usb_endpoint_maxp() returns wMaxPacketSize in its
raw form. Without taking into consideration that it
also contains other bits reserved for isochronous
endpoints.

This patch fixes one occasion where this is a
problem by making sure that we initialize
ep->maxpacket only with lower 10 bits of the value
returned by usb_endpoint_maxp(). Note that seperate
patches will be necessary to audit all call sites of
usb_endpoint_maxp() and make sure that
usb_endpoint_maxp() only returns lower 10 bits of
wMaxPacketSize.

Cc: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
This commit is contained in:
Felipe Balbi 2016-09-28 10:38:11 +03:00
parent 541b6fe630
commit e8f29bb719
1 changed files with 1 additions and 1 deletions
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2
drivers/usb/gadget/composite.c
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@ -197,7 +197,7 @@ int config_ep_by_speed(struct usb_gadget *g,
ep_found:
/* commit results */
_ep->maxpacket = usb_endpoint_maxp(chosen_desc);
_ep->maxpacket = usb_endpoint_maxp(chosen_desc) & 0x7ff;
_ep->desc = chosen_desc;
_ep->comp_desc = NULL;
_ep->maxburst = 0;