cvs commit: src/sys/dev/usb ugen.c

M. Warner Losh imp at
Wed Sep 8 00:22:39 PDT 2004

In message: <200409080713.i887Dd54058789 at>
            Warner Losh <imp at> writes:
: imp         2004-09-08 07:13:39 UTC
:   FreeBSD src repository
:   Modified files:
:     sys/dev/usb          ugen.c 
:   Log:
:   Back out 1.88.
             1.87 I mean.
:   The reference counts are there to block detach until the sleepers in
:   read/write/ioctl have gotten out, not to prevent the open device from
:   going away.  Restore the old behavior so that we have a chance to wake
:   up sleepers when the usb device goes away, so they can properly return
:   EIO back to the caller when this happens.
:   Otherwise, we have a guarnateed panic waiting to happen when a device
:   detaches with an active read channel.
:   This should be merged to 5 asap.


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