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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>
This commit is contained in:
Paul Walmsley 2007-05-09 10:47:16 -06:00 committed by Jeff Garzik
parent 5b982c5bb7
commit 5bebf82fff
1 changed files with 9 additions and 5 deletions
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14
drivers/net/pcmcia/ibmtr_cs.c
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@ -189,16 +189,20 @@ static void ibmtr_detach(struct pcmcia_device *link)
{
struct ibmtr_dev_t *info = link->priv;
struct net_device *dev = info->dev;
struct tok_info *ti = netdev_priv(dev);
DEBUG(0, "ibmtr_detach(0x%p)\n", link);
/*
* When the card removal interrupt hits tok_interrupt(),
* bail out early, so we don't crash the machine
*/
ti->sram_phys |= 1;
if (link->dev_node)
unregister_netdev(dev);
{
struct tok_info *ti = netdev_priv(dev);
del_timer_sync(&(ti->tr_timer));
}
del_timer_sync(&(ti->tr_timer));
ibmtr_release(link);