From: Jerome Marchand <jmarchan@redhat.com>
Date: Wed, 5 Jan 2011 15:57:37 +0000 (+0100)
Subject: kref: add kref_test_and_get
X-Git-Tag: v2.6.37.1~153
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=07384b42b672c8ea266ea4ba50c5e50c9323ae9f;p=pandora-kernel.git

kref: add kref_test_and_get

commit e4a683c899cd5a49f8d684a054c95bd115a0c005 upstream.

Add kref_test_and_get() function, which atomically add a reference only if
refcount is not zero. This prevent to add a reference to an object that is
already being removed.

Signed-off-by: Jerome Marchand <jmarchan@redhat.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---

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