Vittorio Gambaletta 62a8252a0f mac80211: Fix race condition leading to wifi interfaces not coming up at boot sometimes. ... In the drv_mac80211_setup function, mac80211_interface_cleanup is called to ask the kernel to delete all existing interfaces for the phy that is being configured via netlink. Later in the first function, mac80211_prepare_vif is called to set up the new interfaces as required. But sometimes, when mac80211_prepare_vif (and so the relevant `iw phy x interface add y` command) runs, the kernel might still be cleaning up the old interface with the same ifname. It usually takes very few time to do that; possibly a few milliseconds of sleep in the script after detecting this error condition could be enough, but the busybox sh does not support sub-second sleep intervals. When this happens, iw obviously fails to create the new interface; and the following message is printed in the system log, followed by subsequent failure messages from hostapd in case this would have been an AP interface. Tue Mar 14 04:21:57 2017 daemon.notice netifd: radio1 (2767): command failed: Too many open files in system (-23) This was a long-standing issue existing since at least OpenWrt Backfire, and today I finally managed to debug and (hopefully) solve it. It was happening very few times on most devices; but it was happening a lot more frequently on fast platforms with multiple radios, such as the powerpc-based dual-ath9k-radio tl-wdr4900-v1. Signed-off-by: Vittorio Gambaletta <openwrt@vittgam.net> (cherry picked from commit 8301e61365)		2017-12-13 14:52:24 +01:00
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netifd/wireless	mac80211: Fix race condition leading to wifi interfaces not coming up at boot sometimes.	2017-12-13 14:52:24 +01:00
wifi	treewide: fix shellscript syntax errors/typos	2017-09-13 08:07:39 +02:00