1 files changed, 77 insertions, 115 deletions

diff --git a/drivers/char/ipmi/ipmi_si_intf.c b/drivers/char/ipmi/ipmi_si_intf.c
index 6768cb2dd740..ff870aa91cfe 100644
--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -1,3 +1,4 @@
+// SPDX-License-Identifier: GPL-2.0+
 /*
  * ipmi_si.c
  *
@@ -10,27 +11,6 @@
  *
  * Copyright 2002 MontaVista Software Inc.
  * Copyright 2006 IBM Corp., Christian Krafft <krafft@de.ibm.com>
- *
- *  This program is free software; you can redistribute it and/or modify it
- *  under the terms of the GNU General Public License as published by the
- *  Free Software Foundation; either version 2 of the License, or (at your
- *  option) any later version.
- *
- *
- *  THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESS OR IMPLIED
- *  WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF
- *  MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
- *  IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
- *  INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
- *  BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
- *  OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- *  ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR
- *  TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- *  USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
- *
- *  You should have received a copy of the GNU General Public License along
- *  with this program; if not, write to the Free Software Foundation, Inc.,
- *  675 Mass Ave, Cambridge, MA 02139, USA.
  */
 
 /*
@@ -252,6 +232,12 @@ struct smi_info {
 	/* Default driver model device. */
 	struct platform_device *pdev;
 
+	/* Have we added the device group to the device? */
+	bool dev_group_added;
+
+	/* Have we added the platform device? */
+	bool pdev_registered;
+
 	/* Counters and things for the proc filesystem. */
 	atomic_t stats[SI_NUM_STATS];
 
@@ -275,7 +261,8 @@ static int num_max_busy_us;
 static bool unload_when_empty = true;
 
 static int try_smi_init(struct smi_info *smi);
-static void cleanup_one_si(struct smi_info *to_clean);
+static void shutdown_one_si(struct smi_info *smi_info);
+static void cleanup_one_si(struct smi_info *smi_info);
 static void cleanup_ipmi_si(void);
 
 #ifdef DEBUG_TIMING
@@ -2017,18 +2004,13 @@ int ipmi_si_add_smi(struct si_sm_io *io)
 		ipmi_addr_src_to_str(new_smi->io.addr_source),
 		si_to_str[new_smi->io.si_type]);
 
-	/* So we know not to free it unless we have allocated one. */
-	new_smi->intf = NULL;
-	new_smi->si_sm = NULL;
-	new_smi->handlers = NULL;
-
 	list_add_tail(&new_smi->link, &smi_infos);
 
 	if (initialized) {
 		rv = try_smi_init(new_smi);
 		if (rv) {
-			mutex_unlock(&smi_infos_lock);
 			cleanup_one_si(new_smi);
+			mutex_unlock(&smi_infos_lock);
 			return rv;
 		}
 	}
@@ -2047,7 +2029,6 @@ static int try_smi_init(struct smi_info *new_smi)
 	int rv = 0;
 	int i;
 	char *init_name = NULL;
-	bool platform_device_registered = false;
 
 	pr_info(PFX "Trying %s-specified %s state machine at %s address 0x%lx, slave address 0x%x, irq %d\n",
 		ipmi_addr_src_to_str(new_smi->io.addr_source),
@@ -2090,6 +2071,7 @@ static int try_smi_init(struct smi_info *new_smi)
 						      new_smi->intf_num);
 		if (!new_smi->pdev) {
 			pr_err(PFX "Unable to allocate platform device\n");
+			rv = -ENOMEM;
 			goto out_err;
 		}
 		new_smi->io.dev = &new_smi->pdev->dev;
@@ -2168,7 +2150,7 @@ static int try_smi_init(struct smi_info *new_smi)
 		atomic_set(&new_smi->req_events, 1);
 	}
 
-	if (new_smi->pdev) {
+	if (new_smi->pdev && !new_smi->pdev_registered) {
 		rv = platform_device_add(new_smi->pdev);
 		if (rv) {
 			dev_err(new_smi->io.dev,
@@ -2176,7 +2158,7 @@ static int try_smi_init(struct smi_info *new_smi)
 				rv);
 			goto out_err;
 		}
-		platform_device_registered = true;
+		new_smi->pdev_registered = true;
 	}
 
 	dev_set_drvdata(new_smi->io.dev, new_smi);
@@ -2185,8 +2167,9 @@ static int try_smi_init(struct smi_info *new_smi)
 		dev_err(new_smi->io.dev,
 			"Unable to add device attributes: error %d\n",
 			rv);
-		goto out_err_stop_timer;
+		goto out_err;
 	}
+	new_smi->dev_group_added = true;
 
 	rv = ipmi_register_smi(&handlers,
 			       new_smi,
@@ -2196,7 +2179,7 @@ static int try_smi_init(struct smi_info *new_smi)
 		dev_err(new_smi->io.dev,
 			"Unable to register device: error %d\n",
 			rv);
-		goto out_err_remove_attrs;
+		goto out_err;
 	}
 
 #ifdef CONFIG_IPMI_PROC_INTERFACE
@@ -2206,7 +2189,7 @@ static int try_smi_init(struct smi_info *new_smi)
 	if (rv) {
 		dev_err(new_smi->io.dev,
 			"Unable to create proc entry: %d\n", rv);
-		goto out_err_stop_timer;
+		goto out_err;
 	}
 
 	rv = ipmi_smi_add_proc_entry(new_smi->intf, "si_stats",
@@ -2215,7 +2198,7 @@ static int try_smi_init(struct smi_info *new_smi)
 	if (rv) {
 		dev_err(new_smi->io.dev,
 			"Unable to create proc entry: %d\n", rv);
-		goto out_err_stop_timer;
+		goto out_err;
 	}
 
 	rv = ipmi_smi_add_proc_entry(new_smi->intf, "params",
@@ -2224,7 +2207,7 @@ static int try_smi_init(struct smi_info *new_smi)
 	if (rv) {
 		dev_err(new_smi->io.dev,
 			"Unable to create proc entry: %d\n", rv);
-		goto out_err_stop_timer;
+		goto out_err;
 	}
 #endif
 
@@ -2239,56 +2222,8 @@ static int try_smi_init(struct smi_info *new_smi)
 
 	return 0;
 
-out_err_remove_attrs:
-	device_remove_group(new_smi->io.dev, &ipmi_si_dev_attr_group);
-	dev_set_drvdata(new_smi->io.dev, NULL);
-
-out_err_stop_timer:
-	stop_timer_and_thread(new_smi);
-
 out_err:
-	new_smi->interrupt_disabled = true;
-
-	if (new_smi->intf) {
-		ipmi_smi_t intf = new_smi->intf;
-		new_smi->intf = NULL;
-		ipmi_unregister_smi(intf);
-	}
-
-	if (new_smi->io.irq_cleanup) {
-		new_smi->io.irq_cleanup(&new_smi->io);
-		new_smi->io.irq_cleanup = NULL;
-	}
-
-	/*
-	 * Wait until we know that we are out of any interrupt
-	 * handlers might have been running before we freed the
-	 * interrupt.
-	 */
-	synchronize_sched();
-
-	if (new_smi->si_sm) {
-		if (new_smi->handlers)
-			new_smi->handlers->cleanup(new_smi->si_sm);
-		kfree(new_smi->si_sm);
-		new_smi->si_sm = NULL;
-	}
-	if (new_smi->io.addr_source_cleanup) {
-		new_smi->io.addr_source_cleanup(&new_smi->io);
-		new_smi->io.addr_source_cleanup = NULL;
-	}
-	if (new_smi->io.io_cleanup) {
-		new_smi->io.io_cleanup(&new_smi->io);
-		new_smi->io.io_cleanup = NULL;
-	}
-
-	if (new_smi->pdev) {
-		if (platform_device_registered)
-			platform_device_unregister(new_smi->pdev);
-		else
-			platform_device_put(new_smi->pdev);
-		new_smi->pdev = NULL;
-	}
+	shutdown_one_si(new_smi);
 
 	kfree(init_name);
 
@@ -2366,17 +2301,14 @@ skip_fallback_noirq:
 }
 module_init(init_ipmi_si);
 
-static void cleanup_one_si(struct smi_info *to_clean)
+static void shutdown_one_si(struct smi_info *smi_info)
 {
 	int           rv = 0;
 
-	if (!to_clean)
-		return;
-
-	if (to_clean->intf) {
-		ipmi_smi_t intf = to_clean->intf;
+	if (smi_info->intf) {
+		ipmi_smi_t intf = smi_info->intf;
 
-		to_clean->intf = NULL;
+		smi_info->intf = NULL;
 		rv = ipmi_unregister_smi(intf);
 		if (rv) {
 			pr_err(PFX "Unable to unregister device: errno=%d\n",
@@ -2384,49 +2316,79 @@ static void cleanup_one_si(struct smi_info *to_clean)
 		}
 	}
 
-	device_remove_group(to_clean->io.dev, &ipmi_si_dev_attr_group);
-	dev_set_drvdata(to_clean->io.dev, NULL);
-
-	list_del(&to_clean->link);
+	if (smi_info->dev_group_added) {
+		device_remove_group(smi_info->io.dev, &ipmi_si_dev_attr_group);
+		smi_info->dev_group_added = false;
+	}
+	if (smi_info->io.dev)
+		dev_set_drvdata(smi_info->io.dev, NULL);
 
 	/*
 	 * Make sure that interrupts, the timer and the thread are
 	 * stopped and will not run again.
 	 */
-	if (to_clean->io.irq_cleanup)
-		to_clean->io.irq_cleanup(&to_clean->io);
-	stop_timer_and_thread(to_clean);
+	smi_info->interrupt_disabled = true;
+	if (smi_info->io.irq_cleanup) {
+		smi_info->io.irq_cleanup(&smi_info->io);
+		smi_info->io.irq_cleanup = NULL;
+	}
+	stop_timer_and_thread(smi_info);
+
+	/*
+	 * Wait until we know that we are out of any interrupt
+	 * handlers might have been running before we freed the
+	 * interrupt.
+	 */
+	synchronize_sched();
 
 	/*
 	 * Timeouts are stopped, now make sure the interrupts are off
 	 * in the BMC.  Note that timers and CPU interrupts are off,
 	 * so no need for locks.
 	 */
-	while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
-		poll(to_clean);
+	while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) {
+		poll(smi_info);
 		schedule_timeout_uninterruptible(1);
 	}
-	if (to_clean->handlers)
-		disable_si_irq(to_clean);
-	while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
-		poll(to_clean);
+	if (smi_info->handlers)
+		disable_si_irq(smi_info);
+	while (smi_info->curr_msg || (smi_info->si_state != SI_NORMAL)) {
+		poll(smi_info);
 		schedule_timeout_uninterruptible(1);
 	}
+	if (smi_info->handlers)
+		smi_info->handlers->cleanup(smi_info->si_sm);
+
+	if (smi_info->io.addr_source_cleanup) {
+		smi_info->io.addr_source_cleanup(&smi_info->io);
+		smi_info->io.addr_source_cleanup = NULL;
+	}
+	if (smi_info->io.io_cleanup) {
+		smi_info->io.io_cleanup(&smi_info->io);
+		smi_info->io.io_cleanup = NULL;
+	}
 
-	if (to_clean->handlers)
-		to_clean->handlers->cleanup(to_clean->si_sm);
+	kfree(smi_info->si_sm);
+	smi_info->si_sm = NULL;
+}
 
-	kfree(to_clean->si_sm);
+static void cleanup_one_si(struct smi_info *smi_info)
+{
+	if (!smi_info)
+		return;
 
-	if (to_clean->io.addr_source_cleanup)
-		to_clean->io.addr_source_cleanup(&to_clean->io);
-	if (to_clean->io.io_cleanup)
-		to_clean->io.io_cleanup(&to_clean->io);
+	list_del(&smi_info->link);
 
-	if (to_clean->pdev)
-		platform_device_unregister(to_clean->pdev);
+	shutdown_one_si(smi_info);
+
+	if (smi_info->pdev) {
+		if (smi_info->pdev_registered)
+			platform_device_unregister(smi_info->pdev);
+		else
+			platform_device_put(smi_info->pdev);
+	}
 
-	kfree(to_clean);
+	kfree(smi_info);
 }
 
 int ipmi_si_remove_by_dev(struct device *dev)