>> 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. > On Wed, 6 Apr 2016, Michal Nazarewicz wrote: >> 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. On Wed, Apr 06 2016, Alan Stern wrote: > Okay. Then I suggest adding this explanation to the patch > description. Sounds good to me. I’d love someone to test this patch (I sadly have no way of doing that at the moment) and with that I can resend it with updated message. > BTW, is configfs capable of adding a single instance twice in different > configs? Or is that again something only legacy gadgets can do? I don’t think so. I might be wrong though, but here’s configuration from the original post: mkdir functions/mass_storage.0 echo $file > functions/mass_storage.0/lun.0/file ln -s functions/mass_storage.0 configs/c.1 ln -s functions/mass_storage.0 configs/c.2 This makes me suspect it’s not possible to link a function instance to the same configuration twice, but now that I think about it, I’m not quite sure what would happen if one did: ln -s functions/mass_storage.0 configs/c.1/foo ln -s functions/mass_storage.0 configs/c.1/bar -- Best regards ミハウ “𝓶𝓲𝓷𝓪86” ナザレヴイツ «If at first you don’t succeed, give up skydiving» -- To unsubscribe from this list: send the line "unsubscribe linux-usb" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
