Hi Jean,
Em 12-02-2012 08:19, Jean Delvare escreveu:
> Reported by kmemleak.
>
> Signed-off-by: Jean Delvare <kh...@linux-fr.org>
> Cc: Mauro Carvalho Chehab <mche...@infradead.org>
> Cc: Devin Heitmueller <dheitmuel...@kernellabs.com>
> ---
> I am not familiar with the usb API, are we also supposed to call
> usb_kill_urb() in the error case maybe?
>
> drivers/media/dvb/dvb-usb/dib0700_core.c | 2 ++
> 1 file changed, 2 insertions(+)
>
> --- linux-3.3-rc3.orig/drivers/media/dvb/dvb-usb/dib0700_core.c
> 2012-01-20 14:06:38.000000000 +0100
> +++ linux-3.3-rc3/drivers/media/dvb/dvb-usb/dib0700_core.c 2012-02-12
> 00:32:19.005334036 +0100
> @@ -787,6 +787,8 @@ int dib0700_rc_setup(struct dvb_usb_devi
> if (ret)
> err("rc submit urb failed\n");
>
> + usb_free_urb(purb);
> +
> return ret;
> }
>
>
This patch doesn't sound right on my eyes, as you're freeing
an URB that you've just submitted _before_ having it handled
by the dib0700_rc_urb_completion() callback.
Btw, it seems that there's a bug at the fist if there:
static void dib0700_rc_urb_completion(struct urb *purb)
{
struct dvb_usb_device *d = purb->context;
struct dib0700_rc_response *poll_reply;
u32 uninitialized_var(keycode);
u8 toggle;
deb_info("%s()\n", __func__);
if (d == NULL)
return;
if (d->rc_dev == NULL) {
/* This will occur if disable_rc_polling=1 */
usb_free_urb(purb);
return;
}
...
it should be, instead:
if (!d || !d->rc_dev) {
/* This will occur if disable_rc_polling=1 */
usb_free_urb(purb);
return;
}
That's said, clearly there's no condition to stop the DVB IR
handling.
Probably, the right thing to do there is to add a function like:
int dib0700_disconnect(...)
{
usb_unlink_urb(urb);
usb_free_urb(urb);
dvb_usb_device_exit(...);
}
and use such function for the usb_driver disconnect handling:
static struct usb_driver dib0700_driver = {
.name = "dvb_usb_dib0700",
.probe = dib0700_probe,
.disconnect = dib0700_disconnect,
.id_table = dib0700_usb_id_table,
};
Regards,
Mauro
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