bbbee59f4f
[ Upstream commit 03cb4d05b4ea9a3491674ca40952adb708d549fa ]
Calling ncsi_stop_channel_monitor from channel_monitor is a guaranteed
deadlock on SMP because stop calls del_timer_sync on the timer that
invoked channel_monitor as its timer function.
Recognise the inherent race of marking the monitor disabled before
deleting the timer by just returning if enable was cleared. After
a timeout (the default case -- reset to START when response received)
just mark the monitor.enabled false.
If the channel has an entry on the channel_queue list, or if the
state is not ACTIVE or INACTIVE, then warn and mark the timer stopped
and don't restart, as the locking is broken somehow.
Fixes:
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|---|---|---|
| .. | ||
| Kconfig | ||
| Makefile | ||
| internal.h | ||
| ncsi-aen.c | ||
| ncsi-cmd.c | ||
| ncsi-manage.c | ||
| ncsi-netlink.c | ||
| ncsi-netlink.h | ||
| ncsi-pkt.h | ||
| ncsi-rsp.c | ||