Xie He 5acd0cfbfb
net: lapbether: Prevent racing when checking whether the netif is running ...
There are two "netif_running" checks in this driver. One is in
"lapbeth_xmit" and the other is in "lapbeth_rcv". They serve to make
sure that the LAPB APIs called in these functions are called before
"lapb_unregister" is called by the "ndo_stop" function.
However, these "netif_running" checks are unreliable, because it's
possible that immediately after "netif_running" returns true, "ndo_stop"
is called (which causes "lapb_unregister" to be called).
This patch adds locking to make sure "lapbeth_xmit" and "lapbeth_rcv" can
reliably check and ensure the netif is running while doing their work.
Fixes: 1da177e4c3xie.he.0141@gmail.com >
Acked-by: Martin Schiller <ms@dev.tdt.de >
Signed-off-by: David S. Miller <davem@davemloft.net >
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