From: Bryan O'Sullivan <bos@pathscale.com>
Date: Sat, 1 Jul 2006 11:36:05 +0000 (-0700)
Subject: [PATCH] IB/ipath: fix lost interrupts on HT-400
X-Git-Tag: v2.6.18-rc1~223
X-Git-Url: https://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=57abad25f844e760082c0b1ab2b176dad682ea16;p=pandora-kernel.git

[PATCH] IB/ipath: fix lost interrupts on HT-400

Do an extra check to see if in-memory tail changed while processing packets,
and if so, going back through the loop again (but only once per call to
ipath_kreceive()).  In practice, this seems to be enough to guarantee that if
we crossed the clearing of an interrupt at start of ipath_intr with a
scheduled tail register update, that we'll process the "extra" packet that
lost the interrupt because we cleared it just as it was about to arrive.

Signed-off-by: Dave Olson <dave.olson@qlogic.com>
Signed-off-by: Bryan O'Sullivan <bryan.osullivan@qlogic.com>
Cc: "Michael S. Tsirkin" <mst@mellanox.co.il>
Cc: Roland Dreier <rolandd@cisco.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---

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