Commit 3f5a2a713aad28480d86b0add00c68484b54febc 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 descriptors 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: [email protected] Signed-off-by: Jay Cliburn <[email protected]> Reported-by: Tõnu Raitviir <[email protected]> --- drivers/net/atlx/atl1.c | 11 +++++++++++ 1 files changed, 11 insertions(+), 0 deletions(-) diff --git a/drivers/net/atlx/atl1.c b/drivers/net/atlx/atl1.c index def8df8..6d4f051 100644 --- a/drivers/net/atlx/atl1.c +++ b/drivers/net/atlx/atl1.c @@ -3504,6 +3504,8 @@ static int atl1_set_ringparam(struct net_device *netdev, struct atl1_rfd_ring rfd_old, rfd_new; struct atl1_rrd_ring rrd_old, rrd_new; struct atl1_ring_header rhdr_old, rhdr_new; + struct atl1_smb smb; + struct atl1_cmb cmb; int err; tpd_old = adapter->tpd_ring; @@ -3544,11 +3546,20 @@ static int atl1_set_ringparam(struct net_device *netdev, adapter->rrd_ring = rrd_old; adapter->tpd_ring = tpd_old; adapter->ring_header = rhdr_old; + /* + * Save SMB and CMB, since atl1_free_ring_resources + * will clear them as a result of commit + * 3f5a2a713aad28480d86b0add00c68484b54febc + */ + smb = adapter->smb; + cmb = adapter->cmb; atl1_free_ring_resources(adapter); adapter->rfd_ring = rfd_new; adapter->rrd_ring = rrd_new; adapter->tpd_ring = tpd_new; adapter->ring_header = rhdr_new; + adapter->smb = smb; + adapter->cmb = cmb; err = atl1_up(adapter); if (err) -- 1.7.2.3 _______________________________________________ stable mailing list [email protected] http://linux.kernel.org/mailman/listinfo/stable
