Revert "mac80211: remove ath10k delayed initialization hack"

This reverts commit efd9dec319.

ath10k can take a long time to probe, long enough for netifd to fail to
initialize already configured wireless devices

Signed-off-by: Felix Fietkau <nbd@nbd.name>

package/kernel/mac80211/patches/921-ath10k_init_devices_synchronously.patch

@@ -0,0 +1,33 @@
+From: Sven Eckelmann <sven@open-mesh.com>
+Date: Tue, 18 Nov 2014 12:29:28 +0100
+Subject: [PATCH] ath10k: Don't initialize devices asynchronously
+
+OpenWrt requires all PHYs to be initialized to create the configuration files
+during bootup. ath10k violates this because it delays the creation of the PHY
+to a not well defined point in the future.
+
+Forcing the work to be done immediately works around this problem but may also
+delay the boot when firmware images cannot be found.
+
+Signed-off-by: Sven Eckelmann <sven@open-mesh.com>
+---
+
+--- a/drivers/net/wireless/ath/ath10k/core.c
++++ b/drivers/net/wireless/ath/ath10k/core.c
+@@ -2220,6 +2220,16 @@ int ath10k_core_register(struct ath10k *
+ 	ar->chip_id = chip_id;
+ 	queue_work(ar->workqueue, &ar->register_work);
+ 
++	/* OpenWrt requires all PHYs to be initialized to create the
++	 * configuration files during bootup. ath10k violates this
++	 * because it delays the creation of the PHY to a not well defined
++	 * point in the future.
++	 *
++	 * Forcing the work to be done immediately works around this problem
++	 * but may also delay the boot when firmware images cannot be found.
++	 */
++	flush_workqueue(ar->workqueue);
++
+ 	return 0;
+ }
+ EXPORT_SYMBOL(ath10k_core_register);