linux-kernel - [PATCH] ACPI: ipmi: replace usage of found with dedicated list iterator variable

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Date:   Thu, 24 Mar 2022 08:04:41 +0100
From:   Jakob Koschel <jakobkoschel@...il.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Len Brown <lenb@...nel.org>, linux-acpi@...r.kernel.org,
        linux-kernel@...r.kernel.org, Mike Rapoport <rppt@...nel.org>,
        "Brian Johannesmeyer" <bjohannesmeyer@...il.com>,
        Cristiano Giuffrida <c.giuffrida@...nl>,
        "Bos, H.J." <h.j.bos@...nl>, Jakob Koschel <jakobkoschel@...il.com>
Subject: [PATCH] ACPI: ipmi: replace usage of found with dedicated list iterator variable

To move the list iterator variable into the list_for_each_entry_*()
macro in the future it should be avoided to use the list iterator
variable after the loop body.

To *never* use the list iterator variable after the loop it was
concluded to use a separate iterator variable instead of a
found boolean [1].

This removes the need to use a found variable and simply checking if
the variable was set, can determine if the break/goto was hit.

Link: https://lore.kernel.org/all/CAHk-=wgRr_D8CB-D9Kg-c=EHreAsk5SqXPwr9Y7k9sA6cWXJ6w@mail.gmail.com/
Signed-off-by: Jakob Koschel <jakobkoschel@...il.com>
---
 drivers/acpi/acpi_ipmi.c | 39 ++++++++++++++++++---------------------
 1 file changed, 18 insertions(+), 21 deletions(-)

diff --git a/drivers/acpi/acpi_ipmi.c b/drivers/acpi/acpi_ipmi.c
index a5fe2926bf50..0555f68c2dfd 100644
--- a/drivers/acpi/acpi_ipmi.c
+++ b/drivers/acpi/acpi_ipmi.c
@@ -353,29 +353,27 @@ static void ipmi_flush_tx_msg(struct acpi_ipmi_device *ipmi)
 static void ipmi_cancel_tx_msg(struct acpi_ipmi_device *ipmi,
 			       struct acpi_ipmi_msg *msg)
 {
-	struct acpi_ipmi_msg *tx_msg, *temp;
-	bool msg_found = false;
+	struct acpi_ipmi_msg *tx_msg = NULL, *iter, *temp;
 	unsigned long flags;
 
 	spin_lock_irqsave(&ipmi->tx_msg_lock, flags);
-	list_for_each_entry_safe(tx_msg, temp, &ipmi->tx_msg_list, head) {
-		if (msg == tx_msg) {
-			msg_found = true;
-			list_del(&tx_msg->head);
+	list_for_each_entry_safe(iter, temp, &ipmi->tx_msg_list, head) {
+		if (msg == iter) {
+			tx_msg = iter;
+			list_del(&iter->head);
 			break;
 		}
 	}
 	spin_unlock_irqrestore(&ipmi->tx_msg_lock, flags);
 
-	if (msg_found)
+	if (tx_msg)
 		acpi_ipmi_msg_put(tx_msg);
 }
 
 static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
 {
 	struct acpi_ipmi_device *ipmi_device = user_msg_data;
-	bool msg_found = false;
-	struct acpi_ipmi_msg *tx_msg, *temp;
+	struct acpi_ipmi_msg *tx_msg = NULL, *iter, *temp;
 	struct device *dev = ipmi_device->dev;
 	unsigned long flags;
 
@@ -387,16 +385,16 @@ static void ipmi_msg_handler(struct ipmi_recv_msg *msg, void *user_msg_data)
 	}
 
 	spin_lock_irqsave(&ipmi_device->tx_msg_lock, flags);
-	list_for_each_entry_safe(tx_msg, temp, &ipmi_device->tx_msg_list, head) {
-		if (msg->msgid == tx_msg->tx_msgid) {
-			msg_found = true;
-			list_del(&tx_msg->head);
+	list_for_each_entry_safe(iter, temp, &ipmi_device->tx_msg_list, head) {
+		if (msg->msgid == iter->tx_msgid) {
+			tx_msg = iter;
+			list_del(&iter->head);
 			break;
 		}
 	}
 	spin_unlock_irqrestore(&ipmi_device->tx_msg_lock, flags);
 
-	if (!msg_found) {
+	if (!tx_msg) {
 		dev_warn(dev,
 			 "Unexpected response (msg id %ld) is returned.\n",
 			 msg->msgid);
@@ -482,15 +480,14 @@ static void ipmi_register_bmc(int iface, struct device *dev)
 
 static void ipmi_bmc_gone(int iface)
 {
-	struct acpi_ipmi_device *ipmi_device, *temp;
-	bool dev_found = false;
+	struct acpi_ipmi_device *ipmi_device = NULL, *iter, *temp;
 
 	mutex_lock(&driver_data.ipmi_lock);
-	list_for_each_entry_safe(ipmi_device, temp,
+	list_for_each_entry_safe(iter, temp,
 				 &driver_data.ipmi_devices, head) {
-		if (ipmi_device->ipmi_ifnum != iface) {
-			dev_found = true;
-			__ipmi_dev_kill(ipmi_device);
+		if (iter->ipmi_ifnum != iface) {
+			ipmi_device = iter;
+			__ipmi_dev_kill(iter);
 			break;
 		}
 	}
@@ -500,7 +497,7 @@ static void ipmi_bmc_gone(int iface)
 					struct acpi_ipmi_device, head);
 	mutex_unlock(&driver_data.ipmi_lock);
 
-	if (dev_found) {
+	if (ipmi_device) {
 		ipmi_flush_tx_msg(ipmi_device);
 		acpi_ipmi_dev_put(ipmi_device);
 	}

base-commit: f443e374ae131c168a065ea1748feac6b2e76613
-- 
2.25.1