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| author | Ben Hutchings <bhutchings@solarflare.com> | 2012-05-05 02:31:23 +0100 |
|---|---|---|
| committer | Ben Hutchings <bhutchings@solarflare.com> | 2012-05-08 18:26:40 +0100 |
| commit | 3132d2827d92c2ee47fdf4dbec75bba0a2f291cb (patch) | |
| tree | 5664c1ad5ecd6ab7f0bf16354002eeed93619f9c | |
| parent | 1c430a727fa512500a422ffe4712166c550ea06a (diff) | |
| download | op-kernel-dev-3132d2827d92c2ee47fdf4dbec75bba0a2f291cb.zip op-kernel-dev-3132d2827d92c2ee47fdf4dbec75bba0a2f291cb.tar.gz | |
sfc: Fix division by zero when using one RX channel and no SR-IOV
If RSS is disabled on the PF (efx->n_rx_channels == 1) we try to set
up the indirection table so that VFs can use it, setting
efx->rss_spread = efx_vf_size(efx). But if SR-IOV was disabled at
compile time, this evaluates to 0 and we end up dividing by zero when
initialising the table.
I considered changing the fallback definition of efx_vf_size() to
return 1, but its value is really meaningless if we are not going to
enable VFs. Therefore add a condition of efx_sriov_wanted(efx) in
efx_probe_interrupts().
Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
| -rw-r--r-- | drivers/net/ethernet/sfc/efx.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/net/ethernet/sfc/efx.c b/drivers/net/ethernet/sfc/efx.c index 3cbfbff..4a00053 100644 --- a/drivers/net/ethernet/sfc/efx.c +++ b/drivers/net/ethernet/sfc/efx.c @@ -1349,7 +1349,7 @@ static int efx_probe_interrupts(struct efx_nic *efx) } /* RSS might be usable on VFs even if it is disabled on the PF */ - efx->rss_spread = (efx->n_rx_channels > 1 ? + efx->rss_spread = ((efx->n_rx_channels > 1 || !efx_sriov_wanted(efx)) ? efx->n_rx_channels : efx_vf_size(efx)); return 0; |
