For isoc endpoint descriptor, the wMaxPacketSize is not real max packet
size (see Table 9-13. Standard Endpoint Descriptor, USB 2.0 specifcation),
it may contain the number of packet, so the real max packet should be
ep->desc->wMaxPacketSize && 0x7ff.
Cc: Felipe F. Tonello <eu@xxxxxxxxxxxxxxxxx>
Cc: Felipe Balbi <felipe.balbi@xxxxxxxxxxxxxxx>
Fixes: 16b114a6d797 ("usb: gadget: fix usb_ep_align_maybe
endianness and new usb_ep_aligna")
Signed-off-by: Peter Chen <peter.chen@xxxxxxx>
---
Changes for v2:
- Using "&" instead of "&&" for bit operator
- Using API usb_endpoint_maxp to get the max packet size
include/linux/usb/gadget.h | 4 +++-
1 file changed, 3 insertions(+), 1 deletion(-)
diff --git a/include/linux/usb/gadget.h b/include/linux/usb/gadget.h
index 8e81f9e..e4516e9 100644
--- a/include/linux/usb/gadget.h
+++ b/include/linux/usb/gadget.h
@@ -429,7 +429,9 @@ static inline struct usb_gadget *dev_to_usb_gadget(struct device *dev)
*/
static inline size_t usb_ep_align(struct usb_ep *ep, size_t len)
{
- return round_up(len, (size_t)le16_to_cpu(ep->desc->wMaxPacketSize));
+ int max_packet_size = (size_t)usb_endpoint_maxp(ep->desc) & 0x7ff;
+
+ return round_up(len, max_packet_size);
}
/**
--
2.7.4
--
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