releases/4.14.2/ipmi-prefer-acpi-system-interfaces-over-smbios-ones.patch

From 7e030d6dff713250c7dcfb543cad2addaf479b0e Mon Sep 17 00:00:00 2001
From: Corey Minyard <cminyard@mvista.com>
Date: Fri, 8 Sep 2017 14:05:58 -0500
Subject: ipmi: Prefer ACPI system interfaces over SMBIOS ones

From: Corey Minyard <cminyard@mvista.com>

commit 7e030d6dff713250c7dcfb543cad2addaf479b0e upstream.

The recent changes to add SMBIOS (DMI) IPMI interfaces as platform
devices caused DMI to be selected before ACPI, causing ACPI type
of operations to not work.

Signed-off-by: Corey Minyard <cminyard@mvista.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 drivers/char/ipmi/ipmi_si_intf.c |   33 +++++++++++++++++++++++----------
 1 file changed, 23 insertions(+), 10 deletions(-)

--- a/drivers/char/ipmi/ipmi_si_intf.c
+++ b/drivers/char/ipmi/ipmi_si_intf.c
@@ -3424,7 +3424,7 @@ static inline void wait_for_timer_and_th
 		del_timer_sync(&smi_info->si_timer);
 }
 
-static int is_new_interface(struct smi_info *info)
+static struct smi_info *find_dup_si(struct smi_info *info)
 {
 	struct smi_info *e;
 
@@ -3439,24 +3439,36 @@ static int is_new_interface(struct smi_i
 			 */
 			if (info->slave_addr && !e->slave_addr)
 				e->slave_addr = info->slave_addr;
-			return 0;
+			return e;
 		}
 	}
 
-	return 1;
+	return NULL;
 }
 
 static int add_smi(struct smi_info *new_smi)
 {
 	int rv = 0;
+	struct smi_info *dup;
 
 	mutex_lock(&smi_infos_lock);
-	if (!is_new_interface(new_smi)) {
-		pr_info(PFX "%s-specified %s state machine: duplicate\n",
-			ipmi_addr_src_to_str(new_smi->addr_source),
-			si_to_str[new_smi->si_type]);
-		rv = -EBUSY;
-		goto out_err;
+	dup = find_dup_si(new_smi);
+	if (dup) {
+		if (new_smi->addr_source == SI_ACPI &&
+		    dup->addr_source == SI_SMBIOS) {
+			/* We prefer ACPI over SMBIOS. */
+			dev_info(dup->dev,
+				 "Removing SMBIOS-specified %s state machine in favor of ACPI\n",
+				 si_to_str[new_smi->si_type]);
+			cleanup_one_si(dup);
+		} else {
+			dev_info(new_smi->dev,
+				 "%s-specified %s state machine: duplicate\n",
+				 ipmi_addr_src_to_str(new_smi->addr_source),
+				 si_to_str[new_smi->si_type]);
+			rv = -EBUSY;
+			goto out_err;
+		}
 	}
 
 	pr_info(PFX "Adding %s-specified %s state machine\n",
@@ -3865,7 +3877,8 @@ static void cleanup_one_si(struct smi_in
 		poll(to_clean);
 		schedule_timeout_uninterruptible(1);
 	}
-	disable_si_irq(to_clean, false);
+	if (to_clean->handlers)
+		disable_si_irq(to_clean, false);
 	while (to_clean->curr_msg || (to_clean->si_state != SI_NORMAL)) {
 		poll(to_clean);
 		schedule_timeout_uninterruptible(1);