> Hello,
>
> Not so many time ago i noticed such line in dmesg:
>
> radio-mr800 2-1:1.0: Non-NULL drvdata on register
>
> Quick review showed that it appears in usb_amradio_probe fucntions. Then
> i found such code in v4l2_device_register() function (v4l2-device.c
> file):
>
> /* Set name to driver name + device name if it is empty. */
> if (!v4l2_dev->name[0])
> snprintf(v4l2_dev->name, sizeof(v4l2_dev->name), "%s %
> s",
> dev->driver->name, dev_name(dev));
> if (dev_get_drvdata(dev))
> v4l2_warn(v4l2_dev, "Non-NULL drvdata on register\n");
> dev_set_drvdata(dev, v4l2_dev);
> return 0;
>
> The questions is - should i deal with this warning in dmesg? Probably
> the order of callbacks in radio-mr800 probe function is incorrect.
I (or you :-) should look into this: I think the usb subsystem is calling
dev_set_drvdata as well, so we could have a clash here.
> The second questions - should i make atomic_t users counter instead of
> int users counter? Then i can use atomic_inc(), atomic_dec(),
> atomic_set(). It helps me to remove lock/unlock_kernel() functions.
'users' can go away completely: if you grep for it, then you'll see that
it is only set, but never used.
I think I've commented on the kernel lock before: I think it is bogus
here. And that the amradio_set_mute handling is wrong as well: you open
the radio device twice, then close one file descriptor, and suddenly the
audio will be muted, even though there still is a file descriptor open.
Regards,
Hans
>
> --
> Best regards, Klimov Alexey
>
>
--
Hans Verkuil - video4linux developer - sponsored by TANDBERG
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