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Date: Sat, 28 Apr 2007 20:19:20 -0600 (MDT) From: Paul Walmsley <paul@...yaka.com> To: akpm@...ux-foundation.org, linux-kernel@...r.kernel.org cc: netdev@...r.kernel.org, mikep@...uxtr.net Subject: [PATCH] ibmtr_cs: fix hang on eject 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 <paul@...yaka.com> --- 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); - To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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