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authorBert Kenward <bkenward@solarflare.com>2016-11-11 15:56:51 +0000
committerDavid S. Miller <davem@davemloft.net>2016-11-13 13:41:42 -0500
commit46d054f8f540612f09987a53154aa39ae15f2e4c (patch)
treee062d97ded0146e016ee064c02c2bfb7a3f56e3d /drivers/net/eql.c
parent9e37aaa39dccad05c3d8883f0790a804e3ec4810 (diff)
sfc: clear napi_hash state when copying channels
efx_copy_channel() doesn't correctly clear the napi_hash related state. This means that when napi_hash_add is called for that channel nothing is done, and we are left with a copy of the napi_hash_node from the old channel. When we later call napi_hash_del() on this channel we have a stale napi_hash_node. Corruption is only seen when there are multiple entries in one of the napi_hash lists. This is made more likely by having a very large number of channels. Testing was carried out with 512 channels - 32 channels on each of 16 ports. This failure typically appears as protection faults within napi_by_id() or napi_hash_add(). efx_copy_channel() is only used when tx or rx ring sizes are changed (ethtool -G). Fixes: 36763266bbe8 ("sfc: Add support for busy polling") Signed-off-by: Bert Kenward <bkenward@solarflare.com> Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'drivers/net/eql.c')
0 files changed, 0 insertions, 0 deletions