linux-kernel - [PATCH 12/19] vmw_balloon: general style cleanup

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Date:   Mon, 17 Sep 2018 23:38:46 -0700
From:   Nadav Amit <namit@...are.com>
To:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
CC:     <linux-kernel@...r.kernel.org>, Nadav Amit <namit@...are.com>
Subject: [PATCH 12/19] vmw_balloon: general style cleanup

Change all the remaining return values to int to avoid mistakes. Reduce
indentation when possible.

Reviewed-by: Xavier Deguillard <xdeguillard@...are.com>
Signed-off-by: Nadav Amit <namit@...are.com>
---
 drivers/misc/vmw_balloon.c | 39 ++++++++++++++++++++++----------------
 1 file changed, 23 insertions(+), 16 deletions(-)

diff --git a/drivers/misc/vmw_balloon.c b/drivers/misc/vmw_balloon.c
index 50b53213822c..cf5e41dd7048 100644
--- a/drivers/misc/vmw_balloon.c
+++ b/drivers/misc/vmw_balloon.c
@@ -475,10 +475,9 @@ vmballoon_cmd(struct vmballoon *b, unsigned long cmd, unsigned long arg1,
  * Send "start" command to the host, communicating supported version
  * of the protocol.
  */
-static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
+static int vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
 {
 	unsigned long status, capabilities;
-	bool success;
 
 	status = __vmballoon_cmd(b, VMW_BALLOON_CMD_START, req_caps, 0,
 				 &capabilities);
@@ -486,14 +485,12 @@ static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
 	switch (status) {
 	case VMW_BALLOON_SUCCESS_WITH_CAPABILITIES:
 		b->capabilities = capabilities;
-		success = true;
 		break;
 	case VMW_BALLOON_SUCCESS:
 		b->capabilities = VMW_BALLOON_BASIC_CMDS;
-		success = true;
 		break;
 	default:
-		success = false;
+		return -EIO;
 	}
 
 	/*
@@ -507,26 +504,29 @@ static bool vmballoon_send_start(struct vmballoon *b, unsigned long req_caps)
 		b->max_page_size = VMW_BALLOON_2M_PAGE;
 
 
-	return success;
+	return 0;
 }
 
-/*
+/**
+ * vmballoon_send_guest_id - communicate guest type to the host.
+ *
+ * @b: pointer to the balloon.
+ *
  * Communicate guest type to the host so that it can adjust ballooning
  * algorithm to the one most appropriate for the guest. This command
  * is normally issued after sending "start" command and is part of
  * standard reset sequence.
+ *
+ * Return: zero on success or appropriate error code.
  */
-static bool vmballoon_send_guest_id(struct vmballoon *b)
+static int vmballoon_send_guest_id(struct vmballoon *b)
 {
 	unsigned long status;
 
 	status = vmballoon_cmd(b, VMW_BALLOON_CMD_GUEST_ID,
 			       VMW_BALLOON_GUEST_ID, 0);
 
-	if (status == VMW_BALLOON_SUCCESS)
-		return true;
-
-	return false;
+	return status == VMW_BALLOON_SUCCESS ? 0 : -EIO;
 }
 
 /**
@@ -1200,8 +1200,15 @@ static void vmballoon_vmci_cleanup(struct vmballoon *b)
 	}
 }
 
-/*
- * Initialize vmci doorbell, to get notified as soon as balloon changes
+/**
+ * vmballoon_vmci_init - Initialize vmci doorbell.
+ *
+ * @b: pointer to the balloon.
+ *
+ * Return: zero on success or when wakeup command not supported. Error-code
+ * otherwise.
+ *
+ * Initialize vmci doorbell, to get notified as soon as balloon changes.
  */
 static int vmballoon_vmci_init(struct vmballoon *b)
 {
@@ -1263,7 +1270,7 @@ static void vmballoon_reset(struct vmballoon *b)
 	/* free all pages, skipping monitor unlock */
 	vmballoon_pop(b);
 
-	if (!vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
+	if (vmballoon_send_start(b, VMW_BALLOON_CAPABILITIES))
 		return;
 
 	if ((b->capabilities & VMW_BALLOON_BATCHED_CMDS) != 0) {
@@ -1287,7 +1294,7 @@ static void vmballoon_reset(struct vmballoon *b)
 	if (error)
 		pr_err("failed to initialize vmci doorbell\n");
 
-	if (!vmballoon_send_guest_id(b))
+	if (vmballoon_send_guest_id(b))
 		pr_err("failed to send guest ID to the host\n");
 
 	up_write(&b->conf_sem);
-- 
2.17.1