From: NeilBrown <neilb@suse.de>
Date: Thu, 13 Jun 2013 02:53:42 +0000 (+1000)
Subject: sunrpc: Don't schedule an upcall on a replaced cache entry.
X-Git-Tag: v3.11-rc1~32^2~3
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=0bebc633f1428163c9659fd16b34c745e60a0757;p=pandora-kernel.git

sunrpc: Don't schedule an upcall on a replaced cache entry.

When a cache entry is replaced, the "expiry_time" get set to
zero by a call to "cache_fresh_locked(..., 0)" at the end of
"sunrpc_cache_update".

This low expiry time makes cache_check() think that the 'refresh_age'
is negative, so the 'age' is comparatively large and a refresh is
triggered.
However refreshing a replaced entry it pointless, it cannot achieve
anything useful.

So teach cache_check to ignore a low refresh_age when expiry_time
is zero.

Reported-by: Bodo Stroesser <bstroesser@ts.fujitsu.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: J. Bruce Fields <bfields@redhat.com>
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