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usb: gadget: f_hid: Fix zero length packet transfer

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[ Upstream commit ed6f727c575b1eb8136e744acfd5e7306c9548f6 ]

Set the hid req->zero flag of ep0/in_ep to true by default,
then the UDC drivers can transfer a zero length packet at
the end if the hid transfer with size divisible to EPs max
packet size according to the USB 2.0 spec.

Signed-off-by: William Wu <william.wu@rock-chips.com>
Link: https://lore.kernel.org/r/1756204087-26111-1-git-send-email-william.wu@rock-chips.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
William Wu 2025-08-26 18:28:07 +08:00 • committed by Greg Kroah-Hartman
commit 3248107d00
1 changed files with 2 additions and 2 deletions
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4
drivers/usb/gadget/function/f_hid.c
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@ -496,7 +496,7 @@ try_again:
}
req->status = 0;
req->zero = 0;
req->zero = 1;
req->length = count;
req->complete = f_hidg_req_complete;
req->context = hidg;
@ -767,7 +767,7 @@ stall:
return -EOPNOTSUPP;
respond:
req->zero = 0;
req->zero = 1;
req->length = length;
status = usb_ep_queue(cdev->gadget->ep0, req, GFP_ATOMIC);
if (status < 0)