Hi, On Wed, Jun 13, 2012 at 1:14 AM, John W. Linville <linville@xxxxxxxxxxxxx> wrote: > Do you have a version that applies to 3.5 and earlier? the back ported version of this patch http://www.spinics.net/lists/linux-wireless/msg92125.html > > On Tue, Jun 12, 2012 at 08:13:43PM +0530, Mohammed Shafi Shajakhan wrote: >> 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 >> >> 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@xxxxxxx> >> Cc: stable@xxxxxxxxxxxxxxx >> Tested-by: Mohammed Shafi Shajakhan <mohammed@xxxxxxxxxxxxxxxx> >> Signed-off-by: Mohammed Shafi Shajakhan <mohammed@xxxxxxxxxxxxxxxx> >> --- >> drivers/net/wireless/ath/ath9k/link.c | 8 ++++++++ >> 1 files changed, 8 insertions(+), 0 deletions(-) >> >> diff --git a/drivers/net/wireless/ath/ath9k/link.c b/drivers/net/wireless/ath/ath9k/link.c >> index 0cc4c70..a105c94 100644 >> --- a/drivers/net/wireless/ath/ath9k/link.c >> +++ b/drivers/net/wireless/ath/ath9k/link.c >> @@ -136,6 +136,14 @@ void ath_hw_pll_work(struct work_struct *work) >> u32 pll_sqsum; >> struct ath_softc *sc = container_of(work, struct ath_softc, >> hw_pll_work.work); >> + /* >> + * 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 (!test_bit(SC_OP_BEACONS, &sc->sc_flags)) >> + return; >> >> ath9k_ps_wakeup(sc); >> pll_sqsum = ar9003_get_pll_sqsum_dvc(sc->sc_ah); >> -- >> 1.7.0.4 >> >> > > -- > John W. Linville Someday the world will need a hero, and you > linville@xxxxxxxxxxxxx might be all we have. Be ready. > -- > 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 -- thanks, shafi -- 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
