From: Max Filippov <jcmvbkbc@gmail.com>
Date: Fri, 3 Apr 2015 06:56:21 +0000 (+0300)
Subject: xtensa: ISS: fix locking in TAP network adapter
X-Git-Tag: omap-for-v4.1/fixes-rc1~112^2^2~2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=24e94454c8cb6a13634f5a2f5a01da53a546a58d;p=pandora-kernel.git

xtensa: ISS: fix locking in TAP network adapter

- don't lock lp->lock in the iss_net_timer for the call of iss_net_poll,
  it will lock it itself;
- invert order of lp->lock and opened_lock acquisition in the
  iss_net_open to make it consistent with iss_net_poll;
- replace spin_lock with spin_lock_bh when acquiring locks used in
  iss_net_timer from non-atomic context;
- replace spin_lock_irqsave with spin_lock_bh in the iss_net_start_xmit
  as the driver doesn't use lp->lock in the hard IRQ context;
- replace __SPIN_LOCK_UNLOCKED(lp.lock) with spin_lock_init, otherwise
  lockdep is unhappy about using non-static key.

Cc: <stable@vger.kernel.org>
Signed-off-by: Max Filippov <jcmvbkbc@gmail.com>
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