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authorIdo Schimmel <idosch@mellanox.com>2016-01-10 09:32:16 +0100
committerDavid S. Miller <davem@davemloft.net>2016-01-11 00:21:19 -0500
commit366ce60315292a579b8ceae2777102e1954a2024 (patch)
tree2429a281a92e136cb22f4444f8d08ffdb49f19c8 /net
parent712f4aad406bb1ed67f3f98d04c044191f0ff593 (diff)
downloadlinux-366ce60315292a579b8ceae2777102e1954a2024.tar.bz2
mlxsw: spectrum: Add FDB lock to prevent session interleaving
Dumping the FDB (invoked with a process context) or handling FDB notifications (polled periodicly in delayed work) might each entail multiple EMAD transcations due to the number of entries. While we only allow one EMAD transaction at a time, there is nothing stopping the dump and notification processing sessions from interleaving. However, this is forbidden by the hardware, so we need to make sure only one of these sessions can run at a time. Solve this by adding a mutex ('fdb_lock'), as both kernel threads can sleep while waiting for the response EMAD. Fixes: 56ade8fe3f ("mlxsw: spectrum: Add initial support for Spectrum ASIC") Signed-off-by: Ido Schimmel <idosch@mellanox.com> Signed-off-by: Jiri Pirko <jiri@mellanox.com> Signed-off-by: David S. Miller <davem@davemloft.net>
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