From: Ben Hutchings <bhutchings@solarflare.com>
Date: Sat, 5 May 2012 01:31:23 +0000 (+0100)
Subject: sfc: Fix division by zero when using one RX channel and no SR-IOV
X-Git-Tag: v3.4-rc7~4^2~11^2
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=3132d2827d92c2ee47fdf4dbec75bba0a2f291cb;p=pandora-kernel.git

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>
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