linux-kernel - Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another

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Message-ID: <xa1tbn55slxt.fsf@mina86.com>
Date:	Tue, 19 Apr 2016 16:38:38 +0200
From:	Michal Nazarewicz <mina86@...a86.com>
To:	Andrzej Pietrasiewicz <andrzej.p@...sung.com>,
	Alan Stern <stern@...land.harvard.edu>
Cc:	Ivaylo Dimitrov <ivo.g.dimitrov.75@...il.com>,
	Tony Lindgren <tony@...mide.com>, linux-kernel@...r.kernel.org,
	linux-usb@...r.kernel.org,
	Felipe Balbi <felipe.balbi@...ux.intel.com>,
	Bin Liu <b-liu@...com>, pali.rohar@...il.com
Subject: Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another

On Mon, Apr 18 2016, Andrzej Pietrasiewicz wrote:
> The function responsible for verifying if a symlink can be made is in
> drivers/usb/gadget/configfs.c: config_usb_cfg_link()
>
> There is a comment from the author:
>
> 	 * Also a function instance can only be linked once.
>
> This is the code fragment of interest:
>
> 	list_for_each_entry(f, &cfg->func_list, list) {
> 		if (f->fi == fi) {
> 			ret = -EEXIST;
> 			goto out;
> 		}
> 	}

Thanks for checking.  This is exactly the kind of check I expected so
checking for thread not being run multiple times is enough when
configfs is in use.

Legacy gadgets may still construct crazy configurations but I’d call
that a bug in such legacy gadget.

-- 
Best regards
ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ
«If at first you don’t succeed, give up skydiving»