ath10k: Fix crash due to tasklet race.

The tasklet can run after the rings have been cleaned up,
so check for NULL before de-referencing the ring.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: remove ar_pci->ce_count

It wasn't really useful to have it to begin with.
This makes it a little simpler to re-arrange PCI
init code as some function depended on
ar_pci->ce_count being set.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: don't forget to kill fw error tasklet

It was possible for FW error tasklet to be
executed during teardown. This could lead to
system crashes and/or memory corruption.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: split tasklet killing function

The function will soon be called from more than 1
place.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: rename function to match it's role

What the function does is to actually wait for the
firmware indication bit to be set. Prerequisite
for this is having interrupts registered.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: make sure to mask all CE irqs

CE error interrupts were not disabled. This could
lead to invalid memory accesses / memory
corruption.

Also make sure CE watermark interrupts are also
disabled.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: fix ath10k_ce_init() failpath

Make sure to put target back to sleep. This was a
minor issue as it didn't really matter if we put
target back to sleep at this point. It just looked
wrong.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: remove meaningless check

The check doesn't make much sense. If the address
were to be 0x0000 the check would fail. In this
case a 0 address isn't wrong.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: use ath10k_do_pci_wake/sleep

This removes some remaining direct use of the wake
register which could interfere with power state
tracking of the target device. This will allow
initialization code reordering.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: propagate ath10k_ce_disable_interrupts() errors

This shouldn't be silenced. This will be necessary
for PCI init code reordering.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: guard against CE corruption from firmware

In case firmware crashes it may report CE
completions for entries that were never
submitted/filled with meaningful data. This in
turn led to NULL dereferences.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: re-arrange PCI init code

This patch moves irq registering after necessary
structures have been allocated and initialized.
This should prevent interrupts from causing
tasklet access invalid memory pointers.

Reported-By: Ben Greear <greearb@candelatech.com>
Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k: add some debug prints

Some errors were handled too silently. Also add a
print indicating BMI is booted.

Signed-off-by: Michal Kazior <michal.kazior@tieto.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>
ath10k:  Fix un-initialized debug objects.

If the 'ar' registration fails early, the debug
objects were not initialized, and trouble ensued when
the object was later destroyed and the un-initialized
objects were accessed.

Per Kalle's suggestion, move the debug_destroy to the
core_unregister method.

Signed-off-by: Ben Greear <greearb@candelatech.com>
Signed-off-by: Kalle Valo <kvalo@qca.qualcomm.com>