[PATCH] IPMI: fix startup race condition

Matt Domsch noticed a startup race with the IPMI kernel thread, it was
possible (though extraordinarly unlikely) that a message could come in
before the upper layer was ready to handle it.  This patch splits the
startup processing of an IPMI interface into two parts, one to get ready
and one to actually start the processes to receive messages from the
interface.

[akpm@osdl.org: cleanups]
Signed-off-by: Corey Minyard <minyard@acm.org>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

2 files changed, 41 insertions, 27 deletions

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 40eb005..a0b6f79 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -2305,8 +2305,7 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 		      void		       *send_info,
 		      struct ipmi_device_id    *device_id,
 		      struct device            *si_dev,
-		      unsigned char            slave_addr,
-		      ipmi_smi_t               *new_intf)
+		      unsigned char            slave_addr)
 {
 	int              i, j;
 	int              rv;
@@ -2388,9 +2387,9 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
 	if (rv)
 		goto out;
 
-	/* FIXME - this is an ugly kludge, this sets the intf for the
-	   caller before sending any messages with it. */
-	*new_intf = intf;
+	rv = handlers->start_processing(send_info, intf);
+	if (rv)
+		goto out;
 
 	get_guid(intf);
 
diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 35fbd4d..d48d86b 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -972,10 +972,37 @@ static irqreturn_t si_bt_irq_handler(int irq, void *data, struct pt_regs *regs)
 	return si_irq_handler(irq, data, regs);
 }
 
+static int smi_start_processing(void       *send_info,
+				ipmi_smi_t intf)
+{
+	struct smi_info *new_smi = send_info;
+
+	new_smi->intf = intf;
+
+	/* 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;
+	mod_timer(&new_smi->si_timer, jiffies + SI_TIMEOUT_JIFFIES);
+
+ 	if (new_smi->si_type != SI_BT) {
+		new_smi->thread = kthread_run(ipmi_thread, new_smi,
+					      "kipmi%d", new_smi->intf_num);
+		if (IS_ERR(new_smi->thread)) {
+			printk(KERN_NOTICE "ipmi_si_intf: Could not start"
+			       " kernel thread due to error %ld, only using"
+			       " timers to drive the interface\n",
+			       PTR_ERR(new_smi->thread));
+			new_smi->thread = NULL;
+		}
+	}
+
+	return 0;
+}
 
 static struct ipmi_smi_handlers handlers =
 {
 	.owner                  = THIS_MODULE,
+	.start_processing       = smi_start_processing,
 	.sender			= sender,
 	.request_events		= request_events,
 	.set_run_to_completion  = set_run_to_completion,
@@ -2162,9 +2189,13 @@ static void setup_xaction_handlers(struct smi_info *smi_info)
 
 static inline void wait_for_timer_and_thread(struct smi_info *smi_info)
 {
-	if (smi_info->thread != NULL && smi_info->thread != ERR_PTR(-ENOMEM))
-		kthread_stop(smi_info->thread);
-	del_timer_sync(&smi_info->si_timer);
+	if (smi_info->intf) {
+		/* The timer and thread are only running if the
+		   interface has been started up and registered. */
+		if (smi_info->thread != NULL)
+			kthread_stop(smi_info->thread);
+		del_timer_sync(&smi_info->si_timer);
+	}
 }
 
 static struct ipmi_default_vals
@@ -2341,21 +2372,6 @@ static int try_smi_init(struct smi_info *new_smi)
 	if (new_smi->irq)
 		new_smi->si_state = SI_CLEARING_FLAGS_THEN_SET_IRQ;
 
-	/* The ipmi_register_smi() code does some operations to
-	   determine the channel information, so we must be ready to
-	   handle operations before it is called.  This means we have
-	   to stop the timer if we get an error after this point. */
-	init_timer(&(new_smi->si_timer));
-	new_smi->si_timer.data = (long) new_smi;
-	new_smi->si_timer.function = smi_timeout;
-	new_smi->last_timeout_jiffies = jiffies;
-	new_smi->si_timer.expires = jiffies + SI_TIMEOUT_JIFFIES;
-
-	add_timer(&(new_smi->si_timer));
- 	if (new_smi->si_type != SI_BT)
-		new_smi->thread = kthread_run(ipmi_thread, new_smi,
-					      "kipmi%d", new_smi->intf_num);
-
 	if (!new_smi->dev) {
 		/* If we don't already have a device from something
 		 * else (like PCI), then register a new one. */
@@ -2365,7 +2381,7 @@ static int try_smi_init(struct smi_info *new_smi)
 			printk(KERN_ERR
 			       "ipmi_si_intf:"
 			       " Unable to allocate platform device\n");
-			goto out_err_stop_timer;
+			goto out_err;
 		}
 		new_smi->dev = &new_smi->pdev->dev;
 		new_smi->dev->driver = &ipmi_driver;
@@ -2377,7 +2393,7 @@ static int try_smi_init(struct smi_info *new_smi)
 			       " Unable to register system interface device:"
 			       " %d\n",
 			       rv);
-			goto out_err_stop_timer;
+			goto out_err;
 		}
 		new_smi->dev_registered = 1;
 	}
@@ -2386,8 +2402,7 @@ static int try_smi_init(struct smi_info *new_smi)
 			       new_smi,
 			       &new_smi->device_id,
 			       new_smi->dev,
-			       new_smi->slave_addr,
-			       &(new_smi->intf));
+			       new_smi->slave_addr);
 	if (rv) {
 		printk(KERN_ERR
 		       "ipmi_si: Unable to register device: error %d\n",