Oliver Neukum wrote:
Hi,this addresses the FIXME in devio.c::proc_ioctl() and makes BKL usage in this function correct.
Good ...
You misunderstand what it's supposed to do. The ideaBut the USBDEVFS_DISCONNECT ioctl is still fundamentally broken. Switching drivers for a device must be atomic with one ioctl, else there's a race which you cannot fix. The locking must be done in kernel space. A similar race exists for usage through usbfs, only that there's no simple fix. Comments?
is to put the interface into the same state it's in
before any driver binds to it. There's no reason for
that to be anything other than atomic: race-free.
If there's a race binding to some other driver (one
more appropriate to the application), that race would
be present in _all_ binding paths ... there should be
nothing unique to doing it through usbfs.
- Dave
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