[X25]: fix for spinlock recurse and spinlock lockup with timer handler
When the sk_timer function x25_heartbeat_expiry() is called by the kernel in a running/terminating process, spinlock-recursion and spinlock-lockup locks up the kernel. This has happened with testing on some distro's and the patch below fixed it. Signed-off-by: NShaun Pereira <spereira@tusc.com.au> Signed-off-by: NDavid S. Miller <davem@davemloft.net>
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