Re: Re: Subject: [PATCH v1] USB:Core: BugFix: Proper handling of Race Condition when two USB class drivers try to call init_usb_class simultaneously

[gregkh@xxxxxxxxxxxxxxxxxxx]

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http://daringfireball.net/2007/07/on_top

On Tue, Jan 31, 2017 at 05:21:46AM +0000, Ajay Kaher wrote:
> 
>  
> At boot time, probe function of multiple connected devices
> (proprietary devices) execute simultaneously.

What exactly do you mean here?  How can probe happen "simultaneously"?
The USB core prevents this, right?

And what do you mean exactly by "(proprietary devices)"?

> And because of the following code path race condition happens:
> probe->usb_register_dev->init_usb_class

Why is this just showing up now, and hasn't been an issue for the decade
or so this code has been around?  What changed?

> Tested with these changes, and problem has been solved.

What changes?

thanks,

greg k-h