Narrowed it down to the p54common.ko module. If I build a kernel with
CONFIG_DEBUG_SECTION_MISMATCH=y, install it, then rebuild just the p54
driver: make SUBDIRS=drivers/net/wireless/p54/ modules; and update just
the p54common.ko module, the wireless will connect.
I also enabled mac80211 tracing to compare with and without the above
option, and they are mostly identical except in the direct probe phase
the driver is returning many instances of ENOMEM:
wpa_supplicant-926 [000] 408.763132: drv_sw_scan_start: phy0
wpa_supplicant-926 [000] 408.763133: drv_return_void: phy0
wpa_supplicant-926 [000] 408.763134: drv_flush: phy0 drop:0
wpa_supplicant-926 [000] 408.763135: drv_return_void: phy0
wpa_supplicant-926 [000] 408.763136: drv_prepare_multicast: phy0 prepare
mc (2)
wpa_supplicant-926 [000] 408.763137: drv_return_u64: phy0 - 0
wpa_supplicant-926 [000] 408.763138: drv_configure_filter: phy0
changed:0x10 total:0x80000010
wpa_supplicant-926 [000] 408.763138: drv_return_void: phy0
kworker/u:0-935 [000] 408.790633: drv_flush: phy0 drop:0
kworker/u:0-935 [000] 408.790635: drv_return_void: phy0
kworker/u:0-935 [000] 408.890579: drv_config: phy0 ch:0x40 freq:2412
kworker/u:0-935 [000] 408.890580: drv_return_int: phy0 - -12
kworker/u:0-935 [000] 408.890581: drv_config: phy0 ch:0x40 freq:2417
kworker/u:0-935 [000] 408.890582: drv_return_int: phy0 - -12
kworker/u:0-935 [000] 408.890582: drv_config: phy0 ch:0x40 freq:2422
kworker/u:0-935 [000] 408.890583: drv_return_int: phy0 - -12
Which, with the help of many printks, I tracked down to the p54_scan
function of fwio.c in the p54common module. It is returning that because
p54_alloc_skb is returning NULL in the second branch:
unlikely(skb_queue_len(&priv->tx_pending) > 64)
So the outgoing buffer appears to be full. The question is, why does
this only happen when using gcc-4.5 and -fno-inline-functions-called-
once?
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https://bugs.launchpad.net/bugs/722185
Title:
Regression: Does not list available WLAN networks (p54)
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