Re: [PATCH V2] usb: core: allow zero packet flag for interrupt urbs

[Alan Stern]

On Mon, 21 Jul 2014, Amit Virdi wrote:

> Section 4.4.7.2 "Interrupt Transfer Bandwidth Requirements" 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 warning of BOGUS transfer flags.
> 
> Signed-off-by: Amit Virdi 
> Acked-by: Hans de Goede 
> ---
>  drivers/usb/core/urb.c | 1 +
>  1 file changed, 1 insertion(+)
> 
> diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
> index 991386ceb4ec..c9e8ee81b6b7 100644
> --- a/drivers/usb/core/urb.c
> +++ b/drivers/usb/core/urb.c
> @@ -454,6 +454,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
>   URB_FREE_BUFFER);
>   switch (xfertype) {
>   case USB_ENDPOINT_XFER_BULK:
> + case USB_ENDPOINT_XFER_INT:
>   if (is_out)
>   allowed |= URB_ZERO_PACKET;
>   /* FALLTHROUGH */

Acked-by: Alan Stern 

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[PATCH V2] usb: core: allow zero packet flag for interrupt urbs

[Amit Virdi]

Section 4.4.7.2 "Interrupt Transfer Bandwidth Requirements" 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 warning of BOGUS transfer flags.

Signed-off-by: Amit Virdi 
Acked-by: Hans de Goede 
---
 drivers/usb/core/urb.c | 1 +
 1 file changed, 1 insertion(+)

diff --git a/drivers/usb/core/urb.c b/drivers/usb/core/urb.c
index 991386ceb4ec..c9e8ee81b6b7 100644
--- a/drivers/usb/core/urb.c
+++ b/drivers/usb/core/urb.c
@@ -454,6 +454,7 @@ int usb_submit_urb(struct urb *urb, gfp_t mem_flags)
URB_FREE_BUFFER);
switch (xfertype) {
case USB_ENDPOINT_XFER_BULK:
+   case USB_ENDPOINT_XFER_INT:
if (is_out)
allowed |= URB_ZERO_PACKET;
/* FALLTHROUGH */
-- 
1.8.0

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