atl1: fix oops when changing tx/rx ring params
Commit 3f5a2a713a
zeroes out the statistics
message block (SMB) and coalescing message block (CMB) when adapter ring
resources are freed. This is desirable behavior, but, as a side effect,
the commit leads to an oops when atl1_set_ringparam() attempts to alter
the number of rx or tx elements in the ring buffer (by using ethtool
-G, for example). We don't want SMB or CMB to change during this
operation.
Modify atl1_set_ringparam() to preserve SMB and CMB when changing ring
parameters.
Cc: stable@kernel.org
Signed-off-by: Jay Cliburn <jcliburn@gmail.com>
Reported-by: Tõnu Raitviir <jussuf@linux.ee>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
parent
b9556f9a1a
commit
2f32c86721
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@ -3504,6 +3504,8 @@ static int atl1_set_ringparam(struct net_device *netdev,
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struct atl1_rfd_ring rfd_old, rfd_new;
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struct atl1_rrd_ring rrd_old, rrd_new;
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struct atl1_ring_header rhdr_old, rhdr_new;
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struct atl1_smb smb;
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struct atl1_cmb cmb;
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int err;
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tpd_old = adapter->tpd_ring;
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@ -3544,11 +3546,19 @@ static int atl1_set_ringparam(struct net_device *netdev,
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adapter->rrd_ring = rrd_old;
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adapter->tpd_ring = tpd_old;
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adapter->ring_header = rhdr_old;
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/*
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* Save SMB and CMB, since atl1_free_ring_resources
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* will clear them.
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*/
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smb = adapter->smb;
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cmb = adapter->cmb;
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atl1_free_ring_resources(adapter);
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adapter->rfd_ring = rfd_new;
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adapter->rrd_ring = rrd_new;
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adapter->tpd_ring = tpd_new;
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adapter->ring_header = rhdr_new;
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adapter->smb = smb;
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adapter->cmb = cmb;
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err = atl1_up(adapter);
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if (err)
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