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ath9k: Set ATH_OP_HW_RESET before HW reset 

When a HW reset is done, the interrupt tasklet is
disabled before ISRs are disabled in the HW. This
allows a small window where the HW can still generate
interrupts. Since the tasklet is disabled and not killed,
it is not scheduled but deferred for execution at a later
time.

This happens because ATH_OP_HW_RESET is not set when ath_reset()
is called. When the hw_reset_work workqueue is used, this
problem doesn't arise because ATH_OP_HW_RESET is set
and the ISR bails out.

Set ATH_OP_HW_RESET properly in ath_reset() to avoid
this race - all the ath_reset_internal() callers have
been converted to use ath_reset() in the previous patch.

Signed-off-by: Sujith Manoharan <c_manoha@qca.qualcomm.com>
Signed-off-by: John W. Linville <linville@tuxdriver.com>
This commit is contained in:
Sujith Manoharan 2014-10-17 07:40:12 +05:30 committed by John W. Linville
parent 5555c95524
commit ae2ff23930
1 changed files with 12 additions and 0 deletions
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12
drivers/net/wireless/ath/ath9k/main.c
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@ -598,10 +598,17 @@ chip_reset:
#undef SCHED_INTR
}
/*
* This function is called when a HW reset cannot be deferred
* and has to be immediate.
*/
int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);
int r;
set_bit(ATH_OP_HW_RESET, &common->op_flags);
ath9k_ps_wakeup(sc);
r = ath_reset_internal(sc, hchan);
ath9k_ps_restore(sc);
@ -609,6 +616,11 @@ int ath_reset(struct ath_softc *sc, struct ath9k_channel *hchan)
return r;
}
/*
* When a HW reset can be deferred, it is added to the
* hw_reset_work workqueue, but we set ATH_OP_HW_RESET before
* queueing.
*/
void ath9k_queue_reset(struct ath_softc *sc, enum ath_reset_type type)
{
struct ath_common *common = ath9k_hw_common(sc->sc_ah);