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