Am Donnerstag, den 20.07.2017, 08:42 +0800 schrieb Jeffy Chen:
> Currently we are calling usb_submit_urb directly to submit deferred tx
> urbs after unanchor them.
>
> So the usb_giveback_urb_bh would failed to unref it in usb_unanchor_urb
> and cause memory leak:
> unreferenced object 0xffffffc0ce0fa400 (size 256):
> ...
> backtrace:
> [<ffffffc00034a9a8>] __save_stack_trace+0x48/0x6c
> [<ffffffc00034b088>] create_object+0x138/0x254
> [<ffffffc0009d5504>] kmemleak_alloc+0x58/0x8c
> [<ffffffc000345f78>] __kmalloc+0x1d4/0x2a0
> [<ffffffc0006765bc>] usb_alloc_urb+0x30/0x60
> [<ffffffbffc128598>] alloc_ctrl_urb+0x38/0x120 [btusb]
> [<ffffffbffc129e7c>] btusb_send_frame+0x64/0xf8 [btusb]
>
> Put those urbs in tx_anchor to avoid the leak, and also fix the error
> handling.
>
> Signed-off-by: Jeffy Chen <jeffy.chen@xxxxxxxxxxxxxx>
> ---
>
> Changes in v5:
> Fix compile warning reported by "kbuild test robot":
> drivers/bluetooth/btusb.c:3288:3: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
> This 'err' would be set in the send loop, and would be used in the
> cleanup rest urb code outside the loop.
>
> Changes in v4:
> Drop the rest deferred urbs when error happens.
>
> Changes in v3:
> Put the deferred urbs in tx_anchor.
>
> Changes in v2:
> Call usb_free_urb instead of reusing submit_tx_urb.
>
> drivers/bluetooth/btusb.c | 23 ++++++++++++++++++++---
> 1 file changed, 20 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/bluetooth/btusb.c b/drivers/bluetooth/btusb.c
> index 0d533b2..91fdd60 100644
> --- a/drivers/bluetooth/btusb.c
> +++ b/drivers/bluetooth/btusb.c
> @@ -3263,16 +3263,33 @@ static int btusb_suspend(struct usb_interface *intf, pm_message_t message)
> static void play_deferred(struct btusb_data *data)
> {
> struct urb *urb;
> - int err;
> + int err = 0;
>
> while ((urb = usb_get_from_anchor(&data->deferred))) {
> + usb_anchor_urb(urb, &data->tx_anchor);
> +
> err = usb_submit_urb(urb, GFP_ATOMIC);
> - if (err < 0)
> + if (err < 0) {
> + if (err != -EPERM && err != -ENODEV)
> + BT_ERR("%s urb %p submission failed (%d)",
> + data->hdev->name, urb, -err);
> + kfree(urb->setup_packet);
> + usb_unanchor_urb(urb);
> + usb_free_urb(urb);
> break;
> + }
>
> data->tx_in_flight++;
> + usb_free_urb(urb);
> + }
> +
> + /* Cleanup the rest deferred urbs. */
> + while ((urb = usb_get_from_anchor(&data->deferred))) {
> + BT_ERR("%s urb %p submission failed (%d)",
This looks very good, except for this message, which is incorrect.
> + data->hdev->name, urb, -err);
> + kfree(urb->setup_packet);
> + usb_free_urb(urb);
> }
> - usb_scuttle_anchored_urbs(&data->deferred);
> }
>
> static int btusb_resume(struct usb_interface *intf)
Regards
Oliver
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