From: Christoph Hellwig <hch@lst.de>
Date: Mon, 6 Apr 2020 11:58:34 +0000 (+0200)
Subject: PM / sleep: move SNAPSHOT_SET_SWAP_AREA handling into a helper
X-Git-Tag: v5.7-rc1~31^2~2
X-Git-Url: https://git.kernel.dk/?a=commitdiff_plain;h=88a77559cc06f4a80e956dbf2da2a33c5f18c0af;p=linux-block.git

PM / sleep: move SNAPSHOT_SET_SWAP_AREA handling into a helper

Move the handling of the SNAPSHOT_SET_SWAP_AREA ioctl from the main
ioctl helper into a helper function.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
---

diff --git a/kernel/power/user.c b/kernel/power/user.c
index ef90eb1fb86e..0cb555f526e4 100644
--- a/kernel/power/user.c
+++ b/kernel/power/user.c
@@ -196,6 +196,34 @@ unlock:
 	return res;
 }
 
+static int snapshot_set_swap_area(struct snapshot_data *data,
+		void __user *argp)
+{
+	struct resume_swap_area swap_area;
+	sector_t offset;
+	dev_t swdev;
+
+	if (swsusp_swap_in_use())
+		return -EPERM;
+	if (copy_from_user(&swap_area, argp, sizeof(swap_area)))
+		return -EFAULT;
+
+	/*
+	 * User space encodes device types as two-byte values,
+	 * so we need to recode them
+	 */
+	swdev = new_decode_dev(swap_area.dev);
+	if (!swdev) {
+		data->swap = -1;
+		return -EINVAL;
+	}
+	offset = swap_area.offset;
+	data->swap = swap_type_of(swdev, offset, NULL);
+	if (data->swap < 0)
+		return -ENODEV;
+	return 0;
+}
+
 static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 							unsigned long arg)
 {
@@ -351,34 +379,7 @@ static long snapshot_ioctl(struct file *filp, unsigned int cmd,
 		break;
 
 	case SNAPSHOT_SET_SWAP_AREA:
-		if (swsusp_swap_in_use()) {
-			error = -EPERM;
-		} else {
-			struct resume_swap_area swap_area;
-			dev_t swdev;
-
-			error = copy_from_user(&swap_area, (void __user *)arg,
-					sizeof(struct resume_swap_area));
-			if (error) {
-				error = -EFAULT;
-				break;
-			}
-
-			/*
-			 * User space encodes device types as two-byte values,
-			 * so we need to recode them
-			 */
-			swdev = new_decode_dev(swap_area.dev);
-			if (swdev) {
-				offset = swap_area.offset;
-				data->swap = swap_type_of(swdev, offset, NULL);
-				if (data->swap < 0)
-					error = -ENODEV;
-			} else {
-				data->swap = -1;
-				error = -EINVAL;
-			}
-		}
+		error = snapshot_set_swap_area(data, (void __user *)arg);
 		break;
 
 	default: