Sent this patch a few weeks ago to the addresses listed for Token Ring
maintainers. No response, and the linux-tr@ address bounced. Resent
here in case someone wants to pick it up. Perhaps a MAINTAINERS edit
might be in order also.
- Paul
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.
Patch against 2.6.21-rc6.
Signed-off-by: Paul Walmsley <[email protected]>
---
dev/drivers/net/pcmcia/ibmtr_cs.c | 12 ++++++++----
1 file changed, 8 insertions(+), 4 deletions(-)
Index: linux/dev/drivers/net/pcmcia/ibmtr_cs.c
===================================================================
--- linux.orig/dev/drivers/net/pcmcia/ibmtr_cs.c
+++ linux/dev/drivers/net/pcmcia/ibmtr_cs.c
@@ -189,16 +189,20 @@ static void ibmtr_detach(struct pcmcia_d
{
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);
-
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