From: Ben Hutchings <bhutchings@solarflare.com>
Date: Mon, 7 Feb 2011 23:04:38 +0000 (+0000)
Subject: sfc: Distinguish queue lookup from test for queue existence
X-Git-Tag: v2.6.39-rc1~468^2~347^2~1
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=525da9072c28df815bff64bf00f3b11ab88face8;p=pandora-kernel.git

sfc: Distinguish queue lookup from test for queue existence

efx_channel_get_{rx,tx}_queue() currently return NULL if the channel
isn't used for traffic in that direction.  In most cases this is a
bug, but some callers rely on it as an existence test.

Add existence test functions efx_channel_has_{rx_queue,tx_queues}()
and use them as appropriate.

Change efx_channel_get_{rx,tx}_queue() to assert that the requested
queue exists.

Remove now-redundant initialisation from efx_set_channels().

Signed-off-by: Ben Hutchings <bhutchings@solarflare.com>
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