Hello,
I'm trying to debug a wifi bug with 3.4-rt17 applied, running on an
OMAP4 ARM board such as Pandaboard.
Wi-Fi works perfectly well without rt patches. It also works quite well
with rt patches AND without wifi module loaded. But with both rt patches
and wifi module, the system is very flaky and even if I manage to launch
a big download, I get a kernel hang. I managed to get a trace:
BUG: scheduling while atomic: irq/213-wl12xx/1588/0x00010002
Modules linked in: omapdce(C) wl12xx wlcore omaprpc(C) mac80211 d
[<c001beb4>] (unwind_backtrace+0x0/0xf0) from [<c0613548>] (dump)
[<c0613548>] (dump_stack+0x20/0x24) from [<c0073908>] (__schedul)
[<c0073908>] (__schedule_bug+0x54/0x60) from [<c0614818>] (__sch)
[<c0614818>] (__schedule+0x74/0x6c0) from [<c0614f60>] (schedule)
[<c0614f60>] (schedule+0xa0/0xb8) from [<c0615eb8>] (rt_spin_loc)
[<c0615eb8>] (rt_spin_lock_slowlock+0x198/0x288) from [<c06160a8)
[<c06160a8>] (rt_spin_lock+0x18/0x1c) from [<bf0c6b24>] (wl12xx_)
[<bf0c6b24>] (wl12xx_hardirq+0x2c/0xa4 [wlcore]) from [<c00bd4f0)
[<c00bd4f0>] (handle_irq_event_percpu+0xac/0x24c) from [<c00bd70)
[<c00bd70c>] (handle_irq_event+0x7c/0x9c) from [<c00c08f0>] (han)
[<c00c08f0>] (handle_level_irq+0xe4/0x134) from [<c00bcf58>] (ge)
[<c00bcf58>] (generic_handle_irq+0x34/0x3c) from [<c03217e8>] (g)
[<c03217e8>] (gpio_irq_handler+0x160/0x1a4) from [<c00bcf58>] (g)
[<c00bcf58>] (generic_handle_irq+0x34/0x3c) from [<c001449c>] (h)
[<c001449c>] (handle_IRQ+0x88/0xc8)
Source code including the function wl12xx_hardirq is here:
http://dev.omapzoom.org/?p=integration/kernel-ubuntu.git;a=blob;f=drivers/net/wireless/ti/wlcore/main.c;h=45fe911a6504f92dddff5a9415bb77a643b3c4a9;hb=f84c72f6b36418ff11d16808c16a7c3216730bb0
Any idea what could be wrong and how I could debug and fix this situation?
Many thanks in advance,
Grégoire
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