From: Paul Walmsley <paul@booyaka.com>
Date: Wed, 9 May 2007 16:47:16 +0000 (-0600)
Subject: Fix hang on IBM Token Ring PCMCIA card ejection
X-Git-Tag: v2.6.22-rc1~135
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=5bebf82fff53a96f330c0879ffe870bdf3aaeab6;p=pandora-kernel.git

Fix hang on IBM Token Ring PCMCIA card ejection

Ejecting a PCMCIA IBM Token Ring card that has not had its dev->open()
called will reliably trigger an uninitialized spinlock oops when
spinlock debugging is enabled. The system then hangs, occasionally
softlockup oopsing.  Apparently ibmtr.c:tok_interrupt() doesn't expect
to be called before tok_open(), but tok_interrupt() gets called anyway
when the card is ejected.  So, set an already-existing flag which
causes tok_interrupt() to bail out early upon card ejection. Tested by
inserting and removing the PCMCIA card several times.

Signed-off-by: Paul Walmsley <paul@booyaka.com>
Signed-off-by: Jeff Garzik <jeff@garzik.org>
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