From: Mohammed Shafi Shajakhan <mohammed@xxxxxxxxxxxxxxxx> 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 <rolf.offermanns@xxxxxxx> Cc: stable@xxxxxxxxxxxxxxx Signed-off-by: Mohammed Shafi Shajakhan <mohammed@xxxxxxxxxxxxxxxx> --- 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 -- To unsubscribe from this list: send the line "unsubscribe linux-wireless" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
