4.19-stable review patch. If anyone has any objections, please let me know.
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From: Luiz Augusto von Dentz luiz.von.dentz@intel.com
[ Upstream commit 7b05933340f4490ef5b09e84d644d12484b05fdf ]
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 290ba200815f "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: 5e23b923da03 ("[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 Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/bluetooth/btusb.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-)
diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c index b6eb48e44e6b1..c7a1ec57256b4 100644 --- a/drivers/bluetooth/btusb.c +++ b/drivers/bluetooth/btusb.c @@ -743,7 +743,10 @@ 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) {