From: Mohammed Shafi Shajakhan <[email protected]>
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
before the STA is associated PLL4(0x1618c) always seem to dump
zero, which causes a softlockup as we keep on polling infinitely
PLL4's 8th bit. Once PLL4'S 8th bit is set indicates we can take
PLL3(0x16188) readings which tells us whether PLL is locked or not.
if the PLL is not locked we have a rx hang.
It does not looks safe to poll PLL4 before the STA is associated.
so it is safe to check this rx hang after association, where we might
have a possibility of rx hang under stress testing. digging into the
PLL stuff did not yield anything much better.
previously the register dumped 0xdeadbeef and the hw_pll_work
itself is cancelled by ath_radio_disable(obselete)
fixes https://bugzilla.redhat.com/show_bug.cgi?id=811142
Reported-by: Rolf Offermanns <[email protected]>
Cc: [email protected]
Signed-off-by: Mohammed Shafi Shajakhan <[email protected]>
---
drivers/net/wireless/ath/ath9k/main.c | 3 +++
1 files changed, 3 insertions(+), 0 deletions(-)
diff --git a/drivers/net/wireless/ath/ath9k/main.c
b/drivers/net/wireless/ath/ath9k/main.c
index dfa78e8..a03ad3e 100644
--- a/drivers/net/wireless/ath/ath9k/main.c
+++ b/drivers/net/wireless/ath/ath9k/main.c
@@ -970,6 +970,9 @@ void ath_hw_pll_work(struct work_struct *work)
hw_pll_work.work);
u32 pll_sqsum;
+ if (!(sc->sc_flags & SC_OP_PRIM_STA_VIF))
+ return;
+
if (AR_SREV_9485(sc->sc_ah)) {
ath9k_ps_wakeup(sc);
--
1.7.0.4
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