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author | Vittorio Gambaletta <openwrt@vittgam.net> | 2017-03-14 14:45:15 +0100 |
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committer | Felix Fietkau <nbd@nbd.name> | 2017-03-22 11:42:43 +0100 |
commit | 8301e613655c2d95fa5430a1a57d92d966fdc70b (patch) | |
tree | baa316f743028291228df92132ea5a4175888414 /target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom | |
parent | 3a3564ead5e4cf2f6ff73302c1e680b5575079ec (diff) | |
download | upstream-8301e613655c2d95fa5430a1a57d92d966fdc70b.tar.gz upstream-8301e613655c2d95fa5430a1a57d92d966fdc70b.tar.bz2 upstream-8301e613655c2d95fa5430a1a57d92d966fdc70b.zip |
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>
Diffstat (limited to 'target/linux/lantiq/base-files/etc/hotplug.d/firmware/12-ath9k-eeprom')
0 files changed, 0 insertions, 0 deletions