1 files changed, 68 insertions, 0 deletions

diff --git a/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.22/0023-ath9k-Fix-softlockup-in-AR9485.patch b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.22/0023-ath9k-Fix-softlockup-in-AR9485.patch
new file mode 100644
index 00000000..7a88ca07
--- /dev/null
+++ b/recipes-kernel/linux/linux-ti33x-psp-3.2/3.2.22/0023-ath9k-Fix-softlockup-in-AR9485.patch
@@ -0,0 +1,68 @@
+From 7195eb3dcc15a2a0ea8c557806abf32241e276d1 Mon Sep 17 00:00:00 2001
+From: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
+Date: Wed, 13 Jun 2012 21:28:09 +0530
+Subject: [PATCH 23/46] ath9k: Fix softlockup in AR9485
+
+commit bcb7ad7bcbef030e6ba71ede1f9866368aca7c99 upstream.
+
+steps to recreate:
+load latest ath9k driver with AR9485
+stop the network-manager and wpa_supplicant
+bring the interface up
+
+        Call Trace:
+        [<ffffffffa0517490>] ? ath_hw_check+0xe0/0xe0 [ath9k]
+        [<ffffffff812cd1e8>] __const_udelay+0x28/0x30
+        [<ffffffffa03bae7a>] ar9003_get_pll_sqsum_dvc+0x4a/0x80 [ath9k_hw]
+        [<ffffffffa05174eb>] ath_hw_pll_work+0x5b/0xe0 [ath9k]
+        [<ffffffff810744fe>] process_one_work+0x11e/0x470
+        [<ffffffff8107530f>] worker_thread+0x15f/0x360
+        [<ffffffff810751b0>] ? manage_workers+0x230/0x230
+        [<ffffffff81079af3>] kthread+0x93/0xa0
+        [<ffffffff815fd3a4>] kernel_thread_helper+0x4/0x10
+        [<ffffffff81079a60>] ? kthread_freezable_should_stop+0x70/0x70
+        [<ffffffff815fd3a0>] ? gs_change+0x13/0x13
+
+ensure that the PLL-WAR for AR9485/AR9340 is executed only if the STA is
+associated (or) IBSS/AP mode had started beaconing. Ideally this WAR
+is needed to recover from some rare beacon stuck during stress testing.
+Before the STA is associated/IBSS had started beaconing, PLL4(0x1618c)
+always seem to have zero even though we had configured PLL3(0x16188) to
+query about PLL's locking status. When we keep on polling infinitely PLL4's
+8th bit(ie check for PLL locking measurements is done), machine hangs
+due to softlockup.
+
+fixes https://bugzilla.redhat.com/show_bug.cgi?id=811142
+
+Reported-by: Rolf Offermanns <rolf.offermanns@gmx.net>
+Tested-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
+Signed-off-by: Mohammed Shafi Shajakhan <mohammed@qca.qualcomm.com>
+Signed-off-by: John W. Linville <linville@tuxdriver.com>
+Signed-off-by: Ben Hutchings <ben@decadent.org.uk>
+---
+ drivers/net/wireless/ath/ath9k/main.c |    9 +++++++++
+ 1 file changed, 9 insertions(+)
+
+diff --git a/drivers/net/wireless/ath/ath9k/main.c b/drivers/net/wireless/ath/ath9k/main.c
+index 5b22ecd..95437fc 100644
+--- a/drivers/net/wireless/ath/ath9k/main.c
++++ b/drivers/net/wireless/ath/ath9k/main.c
+@@ -1042,6 +1042,15 @@ void ath_hw_pll_work(struct work_struct *work)
+                                            hw_pll_work.work);
+        u32 pll_sqsum;
+ 
++       /*
++        * ensure that the PLL WAR is executed only
++        * after the STA is associated (or) if the
++        * beaconing had started in interfaces that
++        * uses beacons.
++        */
++       if (!(sc->sc_flags & SC_OP_BEACONS))
++               return;
++
+        if (AR_SREV_9485(sc->sc_ah)) {
+ 
+                ath9k_ps_wakeup(sc);
+-- 
+1.7.10
+