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Bluetooth: btusb: Fix not handling ZPL/short-transfer

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Requesting transfers of the exact same size of wMaxPacketSize may result
in ZPL/short-transfer since the USB stack cannot handle it as we are
limiting the buffer size to be the same as wMaxPacketSize.

Also, in terms of throughput this change has the same effect to
interrupt endpoint as 290ba20081 "Bluetooth: Improve USB driver throughput
by increasing the frame size" had for the bulk endpoint, so users of the
advertisement bearer (e.g. BT Mesh) may benefit from this change.

Fixes: 5e23b923da ("[Bluetooth] Add generic driver for Bluetooth USB devices")
Signed-off-by: Luiz Augusto von Dentz <luiz.von.dentz@intel.com>
Tested-by: Kiran K <kiran.k@intel.com>
This commit is contained in:
Luiz Augusto von Dentz 2024-09-09 16:51:52 -04:00
parent 39e4bfb466
commit 7b05933340
1 changed files with 4 additions and 1 deletions
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5
drivers/bluetooth/btusb.c
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@ -1345,7 +1345,10 @@ static int btusb_submit_intr_urb(struct hci_dev *hdev, gfp_t mem_flags)
if (!urb)
return -ENOMEM;
size = le16_to_cpu(data->intr_ep->wMaxPacketSize);
/* Use maximum HCI Event size so the USB stack handles
* ZPL/short-transfer automatically.
*/
size = HCI_MAX_EVENT_SIZE;
buf = kmalloc(size, mem_flags);
if (!buf) {