A few fixes of things in the IPMI area, the watchdog

would have issues at panic time cause by a recently
 introduced change, a problem with device numbering,
 one possible panic in the I2C driver (destined for
 stable).
 
 Nothing earth-shattering, but some things that need
 to go in.
 -----BEGIN PGP SIGNATURE-----
 Version: GnuPG v1
 
 iEYEABECAAYFAlkHLe4ACgkQIXnXXONXERctaACgtLPKwEc8IGFcdpQ6njZAJXm/
 eNgAoIRDUTO3SstAWVtanbUEG8ao74gB
 =3InS
 -----END PGP SIGNATURE-----

Merge tag 'for-linux-4.12' of git://github.com/cminyard/linux-ipmi

Pull IPMI updates from Corey Minyard:
 "A few fixes of things in the IPMI area, the watchdog would have issues
  at panic time cause by a recently introduced change, a problem with
  device numbering, one possible panic in the I2C driver (destined for
  stable).

  Nothing earth-shattering, but some things that need to go in"

* tag 'for-linux-4.12' of git://github.com/cminyard/linux-ipmi:
  ipmi/watchdog: fix wdog hang on panic waiting for ipmi response
  ipmi_si: use smi_num for init_name
  ipmi: bt-bmc: Add ast2500 compatible string
  ACPI / IPMI: change warning to debug on timeout
  ACPI / IPMI: allow ACPI_IPMI with IPMI_SSIF
  ipmi_ssif: use setup_timer
  ipmi: Fix kernel panic at ipmi_ssif_thread()

Documentation/devicetree/bindings/ipmi/aspeed,ast2400-ibt-bmc.txt

@@ -6,7 +6,9 @@ perform in-band IPMI communication with their host.
 
 Required properties:
 
-- compatible : should be "aspeed,ast2400-ibt-bmc"
+- compatible : should be one of
+	"aspeed,ast2400-ibt-bmc"
+	"aspeed,ast2500-ibt-bmc"
 - reg: physical address and size of the registers
 
 Optional properties:

drivers/acpi/Kconfig

@@ -256,7 +256,7 @@ config ACPI_PROCESSOR
 
 config ACPI_IPMI
 	tristate "IPMI"
-	depends on IPMI_SI
+	depends on IPMI_HANDLER
 	default n
 	help
 	  This driver enables the ACPI to access the BMC controller. And it

drivers/acpi/acpi_ipmi.c

@@ -429,8 +429,7 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
 	if (msg->recv_type == IPMI_RESPONSE_RECV_TYPE &&
 	    msg->msg.data_len == 1) {
 		if (msg->msg.data[0] == IPMI_TIMEOUT_COMPLETION_CODE) {
-			dev_WARN_ONCE(dev, true,
-				      "Unexpected response (timeout).\n");
+			dev_dbg_once(dev, "Unexpected response (timeout).\n");
 			tx_msg->msg_done = ACPI_IPMI_TIMEOUT;
 		}
 		goto out_comp;

drivers/char/ipmi/bt-bmc.c

@@ -523,6 +523,7 @@ static int bt_bmc_remove(struct platform_device *pdev)
 
 static const struct of_device_id bt_bmc_match[] = {
 	{ .compatible = "aspeed,ast2400-ibt-bmc" },
+	{ .compatible = "aspeed,ast2500-ibt-bmc" },
 	{ },
 };
 

drivers/char/ipmi/ipmi_si_intf.c

@@ -1954,7 +1954,9 @@ static int hotmod_handler(const char *val, struct kernel_param *kp)
 				kfree(info);
 				goto out;
 			}
+			mutex_lock(&smi_infos_lock);
 			rv = try_smi_init(info);
+			mutex_unlock(&smi_infos_lock);
 			if (rv) {
 				cleanup_one_si(info);
 				goto out;
@@ -2042,8 +2044,10 @@ static int hardcode_find_bmc(void)
 		info->slave_addr = slave_addrs[i];
 
 		if (!add_smi(info)) {
+			mutex_lock(&smi_infos_lock);
 			if (try_smi_init(info))
 				cleanup_one_si(info);
+			mutex_unlock(&smi_infos_lock);
 			ret = 0;
 		} else {
 			kfree(info);
@@ -3492,6 +3496,11 @@ out_err:
 	return rv;
 }
 
+/*
+ * Try to start up an interface.  Must be called with smi_infos_lock
+ * held, primarily to keep smi_num consistent, we only one to do these
+ * one at a time.
+ */
 static int try_smi_init(struct smi_info *new_smi)
 {
 	int rv = 0;
@@ -3524,9 +3533,12 @@ static int try_smi_init(struct smi_info *new_smi)
 		goto out_err;
 	}
 
+	new_smi->intf_num = smi_num;
+
 	/* Do this early so it's available for logs. */
 	if (!new_smi->dev) {
-		init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d", 0);
+		init_name = kasprintf(GFP_KERNEL, "ipmi_si.%d",
+				      new_smi->intf_num);
 
 		/*
 		 * If we don't already have a device from something
@@ -3593,8 +3605,6 @@ static int try_smi_init(struct smi_info *new_smi)
 
 	new_smi->interrupt_disabled = true;
 	atomic_set(&new_smi->need_watch, 0);
-	new_smi->intf_num = smi_num;
-	smi_num++;
 
 	rv = try_enable_event_buffer(new_smi);
 	if (rv == 0)
@@ -3661,6 +3671,9 @@ static int try_smi_init(struct smi_info *new_smi)
 		goto out_err_stop_timer;
 	}
 
+	/* Don't increment till we know we have succeeded. */
+	smi_num++;
+
 	dev_info(new_smi->dev, "IPMI %s interface initialized\n",
 		 si_to_str[new_smi->si_type]);
 

drivers/char/ipmi/ipmi_ssif.c

@@ -891,6 +891,7 @@ static void msg_written_handler(struct ssif_info *ssif_info, int result,
 		 * for details on the intricacies of this.
 		 */
 		int left;
+		unsigned char *data_to_send;
 
 		ssif_inc_stat(ssif_info, sent_messages_parts);
 
@@ -899,6 +900,7 @@ static void msg_written_handler(struct ssif_info *ssif_info, int result,
 			left = 32;
 		/* Length byte. */
 		ssif_info->multi_data[ssif_info->multi_pos] = left;
+		data_to_send = ssif_info->multi_data + ssif_info->multi_pos;
 		ssif_info->multi_pos += left;
 		if (left < 32)
 			/*
@@ -912,7 +914,7 @@ static void msg_written_handler(struct ssif_info *ssif_info, int result,
 		rv = ssif_i2c_send(ssif_info, msg_written_handler,
 				  I2C_SMBUS_WRITE,
 				  SSIF_IPMI_MULTI_PART_REQUEST_MIDDLE,
-				  ssif_info->multi_data + ssif_info->multi_pos,
+				  data_to_send,
 				  I2C_SMBUS_BLOCK_DATA);
 		if (rv < 0) {
 			/* request failed, just return the error. */
@@ -1642,9 +1644,8 @@ static int ssif_probe(struct i2c_client *client, const struct i2c_device_id *id)
 
 	spin_lock_init(&ssif_info->lock);
 	ssif_info->ssif_state = SSIF_NORMAL;
-	init_timer(&ssif_info->retry_timer);
-	ssif_info->retry_timer.data = (unsigned long) ssif_info;
-	ssif_info->retry_timer.function = retry_timeout;
+	setup_timer(&ssif_info->retry_timer, retry_timeout,
+		    (unsigned long)ssif_info);
 
 	for (i = 0; i < SSIF_NUM_STATS; i++)
 		atomic_set(&ssif_info->stats[i], 0);

drivers/char/ipmi/ipmi_watchdog.c

@@ -516,7 +516,7 @@ static void panic_halt_ipmi_heartbeat(void)
 	msg.cmd = IPMI_WDOG_RESET_TIMER;
 	msg.data = NULL;
 	msg.data_len = 0;
-	atomic_add(2, &panic_done_count);
+	atomic_add(1, &panic_done_count);
 	rv = ipmi_request_supply_msgs(watchdog_user,
 				      (struct ipmi_addr *) &addr,
 				      0,
@@ -526,7 +526,7 @@ static void panic_halt_ipmi_heartbeat(void)
 				      &panic_halt_heartbeat_recv_msg,
 				      1);
 	if (rv)
-		atomic_sub(2, &panic_done_count);
+		atomic_sub(1, &panic_done_count);
 }
 
 static struct ipmi_smi_msg panic_halt_smi_msg = {
@@ -550,12 +550,12 @@ static void panic_halt_ipmi_set_timeout(void)
 	/* Wait for the messages to be free. */
 	while (atomic_read(&panic_done_count) != 0)
 		ipmi_poll_interface(watchdog_user);
-	atomic_add(2, &panic_done_count);
+	atomic_add(1, &panic_done_count);
 	rv = i_ipmi_set_timeout(&panic_halt_smi_msg,
 				&panic_halt_recv_msg,
 				&send_heartbeat_now);
 	if (rv) {
-		atomic_sub(2, &panic_done_count);
+		atomic_sub(1, &panic_done_count);
 		printk(KERN_WARNING PFX
 		       "Unable to extend the watchdog timeout.");
 	} else {