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Fix 5 GHz to 2.4 GHz channel switch with hostapd through DISABLE/ENABLE

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When moving a 5 GHz VHT AP to 2.4 GHz band with VHT disabled through the
hostapd control interface DISABLE/reconfig/ENABLE commands, enabling of
the AP on 2.4 GHz failed due to the previously configured VHT capability
being compared with hardware VHT capability on 2.4 GHz band:

hw vht capab: 0x0, conf vht capab: 0x33800132
Configured VHT capability [VHT_CAP_MAX_MPDU_LENGTH_MASK] exceeds max value supported by the driver (2 > 0)
ap: interface state DISABLED->DISABLED

Since VHT (ieee80211ac) config is already disabled for the 2.4 GHz band,
add fix this by validating vht_capab only when VHT is enabled.

Fixes: c781eb8428 ("hostapd: Verify VHT capabilities are supported by driver")
Signed-off-by: Sathishkumar Muruganandam <murugana@codeaurora.org>
This commit is contained in:
Sathishkumar Muruganandam 2018-10-15 20:37:49 +05:30 committed by Jouni Malinen
parent 349c49bac4
commit 72a09d43fe
1 changed files with 2 additions and 1 deletions
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3
src/ap/hw_features.c
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@ -679,7 +679,8 @@ int hostapd_check_ht_capab(struct hostapd_iface *iface)
if (!ieee80211n_supported_ht_capab(iface))
return -1;
#ifdef CONFIG_IEEE80211AC
if (!ieee80211ac_supported_vht_capab(iface))
if (iface->conf->ieee80211ac &&
!ieee80211ac_supported_vht_capab(iface))
return -1;
#endif /* CONFIG_IEEE80211AC */
ret = ieee80211n_check_40mhz(iface);