From: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Date: Fri, 24 Jun 2011 12:08:13 +0000 (+0530)
Subject: ath9k: Fix locking issue during tx completion
X-Git-Tag: v3.1-rc1~316^2~232^2^2~24
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=f6b4e4d476b890e1ddebbed8ec4924f9c2750a31;p=pandora-kernel.git

ath9k: Fix locking issue during tx completion

The received tx status of aggregated frame without BlockAck may
cause deaf state in AR5416 cards. So the driver does a reset to
recover. When this happens, we release the pcu_lock before doing
a reset as ath_rest acquires pcu_lock. This is ugly and also not
atomic. Fixing this addresses the TX DMA failure also.

ath_tx_complete_aggr can be called from different paths which
takes different variants of spin_lock. This patch also addresses
the following warning.

WARNING: at kernel/timer.c:1011 del_timer_sync+0x4e/0x50()
Call Trace:
 <IRQ>  [<ffffffff8104be3a>] warn_slowpath_common+0x7a/0xb0
 [<ffffffff8104be85>] warn_slowpath_null+0x15/0x20
 [<ffffffff8105915e>] del_timer_sync+0x4e/0x50
 [<ffffffffa03726be>] ath_reset+0x3e/0x210 [ath9k]
 [<ffffffff8135cdaf>] ? _raw_spin_unlock_bh+0x1f/0x30
 [<ffffffffa037760a>] ath_tx_complete_aggr.isra.26+0x54a/0xa40 [ath9k]

Signed-off-by: Rajkumar Manoharan <rmanohar@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
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