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Message-ID: <5255a576a562f60c185e89b5937357290242fe1e.1405586653.git.amit.virdi@st.com> Date: Thu, 17 Jul 2014 14:17:22 +0530 From: Amit Virdi <amit.virdi@...com> To: <linux-usb@...r.kernel.org>, <linux-kernel@...r.kernel.org> Cc: <gregkh@...uxfoundation.org>, <stern@...land.harvard.edu>, <rdunlap@...radead.org>, <ming.lei@...onical.com>, <hdegoede@...hat.com>, <hsi-ss-sw-devel@...ts.codex.cro.st.com>, Amit Virdi <amit.virdi@...com> Subject: [PATCH] usb: core: allow zero packet flag for interrupt urbs Section 4.4.7.2 of the USB3.0 spec says: A zero-length data payload is a valid transfer and may be useful for some implementations. So, extend the logic of allowing URB_ZERO_PACKET to interrupt urbs too. Otherwise, the kernel throws error of BOGUS transfer flags. Signed-off-by: Amit Virdi <amit.virdi@...com> --- drivers/usb/core/urb.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c index 991386c..a136246 100644 --- a/drivers/usb/core/urb.c +++ b/drivers/usb/core/urb.c @@ -460,6 +460,10 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags) case USB_ENDPOINT_XFER_CONTROL: allowed |= URB_NO_FSBR; /* only affects UHCI */ /* FALLTHROUGH */ + case USB_ENDPOINT_XFER_INT: + if (is_out) + allowed |= URB_ZERO_PACKET; + /* FALLTHROUGH */ default: /* all non-iso endpoints */ if (!is_out) allowed |= URB_SHORT_NOT_OK; -- 1.8.0 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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