tree b4b854e714747a2c45b34f1bc91170a5b7c9f579
parent 8bfeabadaae9e1eb296a757bbdc4132f23f2fb62
author Alan Stern <stern@rowland.harvard.edu> 1358872655 -0500
committer Matthias Kaehlcke <mka@google.com> 1433366101 -0700

USB: UHCI: fix IRQ race during initialization

commit 0f815a0a700bc10547449bde6c106051a035a1b9 upstream.

This patch (as1644) fixes a race that occurs during startup in
uhci-hcd.  If the IRQ line is shared with other devices, it's possible
for the handler routine to be called before the data structures are
fully initialized.

The problem is fixed by adding a check to the IRQ handler routine.  If
the initialization hasn't finished yet, the routine will return
immediately.

Signed-off-by: Alan Stern <stern@rowland.harvard.edu>
Reported-by: Don Zickus <dzickus@redhat.com>
Tested-by: "Huang, Adrian (ISS Linux TW)" <adrian.huang@hp.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Ben Hutchings <ben@decadent.org.uk>