linux-kernel - Re: [PATCH] bluetooth: bfusb: Check the endpoint type at probe

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Message-Id: <E8995590-F2D5-4E8E-80EF-874AFFB72784@holtmann.org>
Date:   Fri, 13 May 2022 14:53:14 +0200
From:   Marcel Holtmann <marcel@...tmann.org>
To:     Zheyu Ma <zheyuma97@...il.com>
Cc:     Johan Hedberg <johan.hedberg@...il.com>,
        Luiz Augusto von Dentz <luiz.dentz@...il.com>,
        BlueZ <linux-bluetooth@...r.kernel.org>,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH] bluetooth: bfusb: Check the endpoint type at probe

Hi Zheyu,

> The driver reported an warning in usb_submit_urb() which is caused by
> wrong endpoint type.
> 
> [    3.295630] usb 1-1: BOGUS urb xfer, pipe 3 != type 1
> [    3.295916] WARNING: CPU: 0 PID: 33 at drivers/usb/core/urb.c:503 usb_submit_urb+0xcd9/0x18b0
> [    3.298155] RIP: 0010:usb_submit_urb+0xcd9/0x18b0
> [    3.302451] Call Trace:
> [    3.302580]  <TASK>
> [    3.302698]  bfusb_rx_submit+0x24e/0x390 [bfusb]
> [    3.302938]  bfusb_open+0x50/0x90 [bfusb]
> 
> Fix this by checking the endpoint type at first.
> 
> Signed-off-by: Zheyu Ma <zheyuma97@...il.com>
> ---
> drivers/bluetooth/bfusb.c | 4 +++-
> 1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/drivers/bluetooth/bfusb.c b/drivers/bluetooth/bfusb.c
> index cab93935cc7f..447b6876c552 100644
> --- a/drivers/bluetooth/bfusb.c
> +++ b/drivers/bluetooth/bfusb.c
> @@ -613,7 +613,9 @@ static int bfusb_probe(struct usb_interface *intf, const struct usb_device_id *i
> 	bulk_out_ep = &intf->cur_altsetting->endpoint[0];
> 	bulk_in_ep  = &intf->cur_altsetting->endpoint[1];
> 
> -	if (!bulk_out_ep || !bulk_in_ep) {
> +	if (!bulk_out_ep || !bulk_in_ep ||
> +		!usb_endpoint_is_bulk_out(&bulk_out_ep->desc) ||
> +		!usb_endpoint_is_bulk_in(&bulk_in_ep->desc)) {
> 		BT_ERR("Bulk endpoints not found");
> 		goto done;
> 	}

how are you getting this. This driver only works on one specific piece of hardware.

Regards

Marcel