qcacld-3.0: Remove validate_context check from wlan_resume

Presently, there is a very narrow race condition that causes
scheduler_thread to remain in a suspended state for undefined period of
time. The race condition occuers between idle_psoc_timeout and
wlan_hdd_cfg80211_resume_wlan.

As a part of idle_psoc_timeout, the driver calls hdd_wlan_stop_modules
that sets the flag "stop_module_in_progress" and checks if driver is in
suspended state. If yes, it resets the flag and returns. But in the case
of a race condition, before this reset and return is carried out,
wlan_hdd_cfg80211_resume_wlan is invoked. The validate_context inside
the resume function fails due to the above mentioned flag being set. As
a result, resume fails and the driver stays in suspended state. This
causes the driver to enter a infinite loop of stop_modules not being
successful.

To close this small window of contention, remove the validate_context
check. hdd_ctx is always guranteed to be valid and also DSC takes
care of synchronizing the operation, thus the check is redundant.

Change-Id: I723f78e4c33bdc531776c46eff2428dbd869493f
CRs-Fixed: 2616177

core/hdd/src/wlan_hdd_power.c

@@ -1766,12 +1766,6 @@ static int __wlan_hdd_cfg80211_resume_wlan(struct wiphy *wiphy)
 		goto exit_with_code;
 	}
 
-	exit_code = wlan_hdd_validate_context(hdd_ctx);
-	if (exit_code) {
-		hdd_err("Invalid HDD context");
-		goto exit_with_code;
-	}
-
 	if (hdd_ctx->config->is_wow_disabled) {
 		hdd_err("wow is disabled");
 		return -EINVAL;