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| author |   Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-09-28 12:33:31 +0300 |
|---|---|---|
| committer | Felipe Balbi <felipe.balbi@linux.intel.com> | 2016-10-31 11:15:33 +0200 |
| commit | eaa496ffaaf19591fe471a36cef366146eeb9153 (patch) | |
| tree | d199c704ead31ac61be04909be70b34785b29e10 /drivers/usb/gadget/composite.c | |
| parent | usb: gadget: composite: correctly initialize ep->maxpacket (diff) | |
| download | linux-dev-eaa496ffaaf19591fe471a36cef366146eeb9153.tar.xz linux-dev-eaa496ffaaf19591fe471a36cef366146eeb9153.zip | |
usb: gadget: composite: always set ep->mult to a sensible value
ep->mult is supposed to be set to Isochronous and
Interrupt Endapoint's multiplier value. This value
is computed from different places depending on the
link speed.
If we're dealing with HighSpeed, then it's part of
bits [12:11] of wMaxPacketSize. This case wasn't
taken into consideration before.
While at that, also make sure the ep->mult defaults
to one so drivers can use it unconditionally and
assume they'll never multiply ep->maxpacket to zero.
Cc: <stable@vger.kernel.org>
Signed-off-by: Felipe Balbi <felipe.balbi@linux.intel.com>
Diffstat (limited to 'drivers/usb/gadget/composite.c')
| -rw-r--r-- | drivers/usb/gadget/composite.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/usb/gadget/composite.c b/drivers/usb/gadget/composite.c index f6a7583ab6d1..0426d3c1fff9 100644 --- a/drivers/usb/gadget/composite.c +++ b/drivers/usb/gadget/composite.c @@ -201,7 +201,12 @@ ep_found: _ep->desc = chosen_desc; _ep->comp_desc = NULL; _ep->maxburst = 0; - _ep->mult = 0; + _ep->mult = 1; + + if (g->speed == USB_SPEED_HIGH && (usb_endpoint_xfer_isoc(_ep->desc) || + usb_endpoint_xfer_int(_ep->desc))) + _ep->mult = usb_endpoint_maxp_mult(_ep->desc); + if (!want_comp_desc) return 0; @@ -218,7 +223,7 @@ ep_found: switch (usb_endpoint_type(_ep->desc)) { case USB_ENDPOINT_XFER_ISOC: /* mult: bits 1:0 of bmAttributes */ - _ep->mult = comp_desc->bmAttributes & 0x3; + _ep->mult = (comp_desc->bmAttributes & 0x3) + 1; case USB_ENDPOINT_XFER_BULK: case USB_ENDPOINT_XFER_INT: _ep->maxburst = comp_desc->bMaxBurst + 1; |