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

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On Wed, 6 Apr 2016, Michal Nazarewicz wrote:

> On Tue, Apr 05 2016, Alan Stern wrote:
> > Suppose one usb_function is carrying out an I/O operation while
> > another one in the same config gets a Set-Interface request from the
> > host.
> 
> That cannot happen.  A single instance of mass_storage cannot¹ be added
> twice to the same configuration.
> 
> ¹ To be more precise, not via configfs.  A legacy gadget could do that,
>   but that would be a bug in that legacy driver, not f_mass_storage.
>   Moreover, no current legacy gadgets do that though so IMO this is an
>   academic discussion.

Okay.  Then I suggest adding this explanation to the patch description.

BTW, is configfs capable of adding a single instance twice in different 
configs?  Or is that again something only legacy gadgets can do?

Alan Stern

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Thread

[PATCH] usb: f_mass_storage: test whether thread is running before starting another Michal Nazarewicz <mina86@mina86.com> - 2016-04-05 19:30 +0200
  Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Alan Stern <stern@rowland.harvard.edu> - 2016-04-05 19:50 +0200
    Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another Michal Nazarewicz <mina86@mina86.com> - 2016-04-05 20:10 +0200
      Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Alan Stern <stern@rowland.harvard.edu> - 2016-04-05 20:40 +0200
        Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another Michal Nazarewicz <mina86@mina86.com> - 2016-04-06 00:30 +0200
          Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Alan Stern <stern@rowland.harvard.edu> - 2016-04-06 17:10 +0200
            Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another Michal Nazarewicz <mina86@mina86.com> - 2016-04-07 12:00 +0200
              Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Alan Stern <stern@rowland.harvard.edu> - 2016-04-07 16:30 +0200
                Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> - 2016-04-07 16:50 +0200
                Re: [PATCH] usb: f_mass_storage: test whether thread is running  before starting another Ivaylo Dimitrov <ivo.g.dimitrov.75@gmail.com> - 2016-04-07 23:00 +0200
                Re: [PATCH] usb: f_mass_storage: test whether thread is running before starting another Michal Nazarewicz <mina86@mina86.com> - 2016-04-07 18:50 +0200

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