On 14-02-2007 22:27, Stephen Hemminger wrote:
> Ben found this but the problem seems pretty widespread.
>
> The following places are subject to deadlock between flush_scheduled_work
> and the RTNL mutex. What can happen is that a work queue routine (like
> bridge port_carrier_check) is waiting forever for RTNL, and the driver
> routine has called flush_scheduled_work with RTNL held and is waiting
> for the work queue to clear.
>
> Several other places have comments like: "can't call flush_scheduled_work
> here or it will deadlock". Most of the problem places are in device close
> routine. My recommendation would be to add a check for device netif_running in
> what ever work routine is used, and move the flush_scheduled_work to the
> remove routine.
>
> 8139too.c: rtl8139_close --> rtl8139_stop_thread
> r8169.c: rtl8169_down
> cassini.c: cas_change_mtu
> iseries_veth.c: veth_stop_connection
> s2io.c: s2io_close
> sis190.c: sis190_down
>
There is probably more than this...
I think the same problem is with
cancel_rearming_delayed_work. Plus indirect calling
these functions: eg. by ieee8021softmac_stop.
I found these dangerous places (probably not all):
cxgb3/cxgb3_main.c (cxgb_close -> cxgb_down),
macb.c (macb_close),
skge.c (skge_down),
wireless/bcm43xx/bcm43xx_main.c (bcm_net_stop both
ieee80211... and flush_...),
wireless/zd1211rw/zd_mac.c (zd_mac_stop ->
housekeeping_disable),
chelsio/my3126.c (t1_interrupts_disable ->
my3126_interrupt_disable), /* not sure */
drivers/usb/net/kaweth.c (kaweth_close ->
kaweth_kill_urbs)
Regards,
Jarek P.
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