drivers/net/wireless/ti/wlcore/main.c: eliminate possible double power off

The function wl12xx_set_power_on is only called twice, once in
wl12xx_chip_wakeup and once in wl12xx_get_hw_info.  On the failure of the
call in wl12xx_chip_wakeup, the containing function just returns, but on
the failure of the call in wl12xx_get_hw_info, the containing function
calls wl1271_power_off.  This does not seem necessary, because if
wl12xx_set_power_on has set the power on and then fails, it has already
turned the power off.

A simplified version of the semantic match that finds this problem is as
follows: (http://coccinelle.lip6.fr/)

// <smpl>
@r@
identifier f,free,a;
parameter list[n] ps;
type T;
expression e;
@@

f(ps,T a,...) {
  ... when any
      when != a = e
  if(...) { ... free(a); ... return ...; }
  ... when any
}

@@
identifier r.f,r.free;
expression x,a;
expression list[r.n] xs;
@@

* x = f(xs,a,...);
  if (...) { ... free(a); ... return ...; }
// </smpl>

Signed-off-by: Julia Lawall <Julia.Lawall@lip6.fr>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: spi: use platform_device_unregister in wl1271_remove()

platform_device_unregister() only calls platform_device_del() and
platform_device_put(), thus use platform_device_unregister() to
simplify the code.

Also the documents in platform.c shows that platform_device_del
and platform_device_put must _only_ be externally called in error
cases.  All other usage is a bug.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: sdio: use platform_device_unregister in wl1271_remove()

platform_device_unregister() only calls platform_device_del() and
platform_device_put(), thus use platform_device_unregister() to
simplify the code.

Also the documents in platform.c shows that platform_device_del
and platform_device_put must _only_ be externally called in error
cases.  All other usage is a bug.

dpatch engine is used to auto generate this patch.
(https://github.com/weiyj/dpatch)

Signed-off-by: Wei Yongjun <yongjun_wei@trendmicro.com.cn>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
drivers/net/wireless/ti/wl1251: remove CONFIG_EXPERIMENTAL

This config item has not carried much meaning for a while now and is
almost always enabled by default. As agreed during the Linux kernel
summit, remove it.

CC: Luciano Coelho <coelho@ti.com>
CC: "John W. Linville" <linville@tuxdriver.com>
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: SPI - fix spi transfer_list

In corner case for wl12xx_spi_raw_write() when
	len == SPI_AGGR_BUFFER_SIZE
we don't setup correctly spi transfer_list.
Next we will have garbage and strange errors
reported by SPI framework (eg. wrong speed_hz,
failed to transfer one message from queue)
when iterate transfer_list.

Signed-off-by: Janusz Dziedzic <janusz.dziedzic@tieto.com>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: Fix the usage of wait_for_completion_timeout

The return value of wait_for_completion_timeout() is always
>= 0 with unsigned int type.

So the condition "ret < 0" or "ret >= 0" is pointless.

Signed-off-by: liu chuansheng <chuansheng.liu@intel.com>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: Remove redundant check on unsigned variable

No need to check whether unsigned variable is less than 0.

CC: Luciano Coelho <coelho@ti.com>
CC: linux-wireless@vger.kernel.org
CC: netdev@vger.kernel.org
Signed-off-by: Tushar Behera <tushar.behera@linaro.org>
Signed-off-by: Luciano Coelho <luca@coelho.fi>
wlcore: start sta role on CHANGED_BSSID

Make the connection flow simpler by starting
sta role on bssid change.

Currently, we start dev role when going idle-off,
and start the sta role only after association
indication. This complicates the connection
flow with some possible intermediate states.

Make it simpler by starting sta role on bssid change,
which now happens *before* auth req get sent.

Update the handling of mac80211's notifications
and change wl1271_join/unjoin accordingly -
* Split wl1271_join() into wlcore_join (tuning on
  a channel/bssid) and wlcore_set_assoc (configure
  sta after association).
* Rename wl1271_unjoin() to wlcore_unset_assoc(), as
  it is no longer the inversion of wl1271_join()
  (now it's only used to disconnect associated sta /
  joined ibss, without stopping the role).
* Set ssid before starting station role (needed for
  start_role(sta)

While on it, split wl1271_bss_info_changed_sta() into
some sub-functions.

since we no longer use dev role in the connection flow,
we now always use the hlid of the sta role.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: workaround start_sta problem in wl12xx fw

for some reason, the wl12xx fw is not able to rx/tx
on the first start_sta cmd.
Workaround it by issuing a dummy start_sta + stop_sta
before starting the sta for the final time.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: implement .remain_on_channel() callback

implement the reamin_on_channel() callback by starting
a dev role (already associated with the current vif)
on the requested channel/band.

This channel is usually different from the channel
of the sta role, so pass it to wl12xx_roc() as well,
and notify mac80211 (async) when the fw is ready
on the new channel.

Now, in case of offchannel tx, we should use the dev
role hlid, instead of the sta hlid.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: get channel from bss_conf instead of hw->conf

We care only about the operational channel, not
about the temporal hw channel (which won't have
any real meaning in multi-channel env anyway)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: add chanctx implementation

Add some basic chanctx implementation - debug prints,
and save the vif's channel/band/type.

After that, we no longer need to handle channel change
notifications on op_config.

Signed-off-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: initiate ROC/CROC on sta state updates

Use the sta_state notifications to ROC when a station
is about to connect, and CROC respectively on
authorization (success) / deletion (failure).

Change the wl12xx_update_sta_state() flow to bail out
only on error, so multiple code blocks could refer
to the same state.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: set active psm on association

The default ps mode of the fw is auto, while the default
ps mode of mac80211 is active (ps off).
In order to sync them, configure active ps on association.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: specify correct supported_rates

The supported_rates field should contain all our supported
rates, even if the remote peer doesn't support them.

(rename CONF_TX_AP_ENABLED_RATES to CONF_TX_ENABLED_RATES,
as we now use it for both ap and sta)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: reconfigure rate policy on association

When first configuring the rate policy, before auth,
we still don't have the correct rates that were
agreed during association.

Reconfigure the rate policy on association in order
to update them.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: refactor CHANGED_HT handling

Pass a variable indicating whether HT is enabled,
instead of duplicating the function call with
different arguments.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: configure the remote rates with our own rates

With the new connection flow, start_sta is called before
the remote rates where updated. Use our own supported rates
instead to make sure we don't disable any potential rate
(the rate policies will be updated later, but there is
currently no way to update the remote rates)

Signed-off-by: Eliad Peller <eliad@wizery.com>
Reviewed-by: Arik Nemtsov <arik@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: print role_id on bss_info_changed

In multi-vif setup it's useful to know the role_id
being configured.

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>
wlcore: don't leak wl->mbox

free it on wlcore_free_hw()

Signed-off-by: Eliad Peller <eliad@wizery.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>