linux-kernel - [PATCH 1/7] IPMI: don't init irq until ready

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Date:	Fri, 12 Oct 2007 11:37:23 -0500
From:	Corey Minyard <minyard@....org>
To:	Andrew Morton <akpm@...l.org>
Cc:	Patrick Schoeller <Patrick.Schoeller@...com>,
	Linux Kernel <linux-kernel@...r.kernel.org>
Subject: [PATCH 1/7] IPMI: don't init irq until ready


From: Corey Minyard <cminyard@...sta.com>

Patrick found a race at startup.  Interrupts were being enabled for
the IPMI interface before the driver was really ready to handle them.
This could result in an oops if something was pending on the interface
at startup and interrupt were already enabled (technically shouldn't
happen, but need to cover for this in real life).  So move the IRQ
setup to the code that starts the actual IPMI processing.

Not needed for the stable kernel, very few IPMI devices have interrupts.

Signed-off-by: Corey Minyard <cminyard@...sta.com>
Cc: Patrick Schoeller <Patrick.Schoeller@...com>

---
Index: linux-2.6.21/drivers/char/ipmi/ipmi_si_intf.c
===================================================================
--- linux-2.6.21.orig/drivers/char/ipmi/ipmi_si_intf.c
+++ linux-2.6.21/drivers/char/ipmi/ipmi_si_intf.c
@@ -1006,6 +1006,10 @@ static int smi_start_processing(void    
 
 	new_smi->intf = intf;
 
+	/* Try to claim any interrupts. */
+	if (new_smi->irq_setup)
+		new_smi->irq_setup(new_smi);
+
 	/* Set up the timer that drives the interface. */
 	setup_timer(&new_smi->si_timer, smi_timeout, (long)new_smi);
 	new_smi->last_timeout_jiffies = jiffies;
@@ -2762,10 +2766,6 @@ static int try_smi_init(struct smi_info 
 	setup_oem_data_handler(new_smi);
 	setup_xaction_handlers(new_smi);
 
-	/* Try to claim any interrupts. */
-	if (new_smi->irq_setup)
-		new_smi->irq_setup(new_smi);
-
 	INIT_LIST_HEAD(&(new_smi->xmit_msgs));
 	INIT_LIST_HEAD(&(new_smi->hp_xmit_msgs));
 	new_smi->curr_msg = NULL;
-
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