add stmac read mac form eeprom

hc

2023-12-09 b22da3d8526a935aa31e086e63f60ff3246cb61c

 kernel/drivers/char/raw.c
..
..
@@ -1,3 +1,4 @@
1
+// SPDX-License-Identifier: GPL-2.0-only
1
2
 /*
2
3
  * linux/drivers/char/raw.c
3
4
  *
..
..
@@ -27,7 +28,8 @@
27
28
 #include <linux/uaccess.h>
28
29
 
29
30
 struct raw_device_data {
30
-	struct block_device *binding;
31
+	dev_t binding;
32
+	struct block_device *bdev;
31
33
 	int inuse;
32
34
 };
33
35
 
..
..
@@ -36,7 +38,7 @@
36
38
 static DEFINE_MUTEX(raw_mutex);
37
39
 static const struct file_operations raw_ctl_fops; /* forward declaration */
38
40
 
39
-static int max_raw_minors = MAX_RAW_MINORS;
41
+static int max_raw_minors = CONFIG_MAX_RAW_DEVS;
40
42
 
41
43
 module_param(max_raw_minors, int, 0);
42
44
 MODULE_PARM_DESC(max_raw_minors, "Maximum number of raw devices (1-65536)");
..
..
@@ -62,19 +64,25 @@
62
64
 		return 0;
63
65
 	}
64
66
 
67
+	pr_warn_ratelimited(
68
+		"process %s (pid %d) is using the deprecated raw device\n"
69
+		"support will be removed in Linux 5.14.\n",
70
+		current->comm, current->pid);
71
+
65
72
 	mutex_lock(&raw_mutex);
66
73
 
67
74
 	/*
68
75
 	 * All we need to do on open is check that the device is bound.
69
76
 	 */
70
-	bdev = raw_devices[minor].binding;
71
77
 	err = -ENODEV;
72
-	if (!bdev)
78
+	if (!raw_devices[minor].binding)
73
79
 		goto out;
74
-	bdgrab(bdev);
75
-	err = blkdev_get(bdev, filp->f_mode | FMODE_EXCL, raw_open);
76
-	if (err)
80
+	bdev = blkdev_get_by_dev(raw_devices[minor].binding,
81
+				 filp->f_mode | FMODE_EXCL, raw_open);
82
+	if (IS_ERR(bdev)) {
83
+		err = PTR_ERR(bdev);
77
84
 		goto out;
85
+	}
78
86
 	err = set_blocksize(bdev, bdev_logical_block_size(bdev));
79
87
 	if (err)
80
88
 		goto out1;
..
..
@@ -84,6 +92,7 @@
84
92
 		file_inode(filp)->i_mapping =
85
93
 			bdev->bd_inode->i_mapping;
86
94
 	filp->private_data = bdev;
95
+	raw_devices[minor].bdev = bdev;
87
96
 	mutex_unlock(&raw_mutex);
88
97
 	return 0;
89
98
 
..
..
@@ -104,7 +113,7 @@
104
113
 	struct block_device *bdev;
105
114
 
106
115
 	mutex_lock(&raw_mutex);
107
-	bdev = raw_devices[minor].binding;
116
+	bdev = raw_devices[minor].bdev;
108
117
 	if (--raw_devices[minor].inuse == 0)
109
118
 		/* Here  inode->i_mapping == bdev->bd_inode->i_mapping  */
110
119
 		inode->i_mapping = &inode->i_data;
..
..
@@ -127,6 +136,7 @@
127
136
 static int bind_set(int number, u64 major, u64 minor)
128
137
 {
129
138
 	dev_t dev = MKDEV(major, minor);
139
+	dev_t raw = MKDEV(RAW_MAJOR, number);
130
140
 	struct raw_device_data *rawdev;
131
141
 	int err = 0;
132
142
 
..
..
@@ -160,25 +170,17 @@
160
170
 		mutex_unlock(&raw_mutex);
161
171
 		return -EBUSY;
162
172
 	}
163
-	if (rawdev->binding) {
164
-		bdput(rawdev->binding);
173
+	if (rawdev->binding)
165
174
 		module_put(THIS_MODULE);
166
-	}
175
+
176
+	rawdev->binding = dev;
167
177
 	if (!dev) {
168
178
 		/* unbind */
169
-		rawdev->binding = NULL;
170
-		device_destroy(raw_class, MKDEV(RAW_MAJOR, number));
179
+		device_destroy(raw_class, raw);
171
180
 	} else {
172
-		rawdev->binding = bdget(dev);
173
-		if (rawdev->binding == NULL) {
174
-			err = -ENOMEM;
175
-		} else {
176
-			dev_t raw = MKDEV(RAW_MAJOR, number);
177
-			__module_get(THIS_MODULE);
178
-			device_destroy(raw_class, raw);
179
-			device_create(raw_class, NULL, raw, NULL,
180
-				      "raw%d", number);
181
-		}
181
+		__module_get(THIS_MODULE);
182
+		device_destroy(raw_class, raw);
183
+		device_create(raw_class, NULL, raw, NULL, "raw%d", number);
182
184
 	}
183
185
 	mutex_unlock(&raw_mutex);
184
186
 	return err;
..
..
@@ -186,18 +188,9 @@
186
188
 
187
189
 static int bind_get(int number, dev_t *dev)
188
190
 {
189
-	struct raw_device_data *rawdev;
190
-	struct block_device *bdev;
191
-
192
191
 	if (number <= 0 || number >= max_raw_minors)
193
192
 		return -EINVAL;
194
-
195
-	rawdev = &raw_devices[number];
196
-
197
-	mutex_lock(&raw_mutex);
198
-	bdev = rawdev->binding;
199
-	*dev = bdev ? bdev->bd_dev : 0;
200
-	mutex_unlock(&raw_mutex);
193
+	*dev = raw_devices[number].binding;
201
194
 	return 0;
202
195
 }
203
196
 
..
..
@@ -316,9 +309,9 @@
316
309
 	int ret;
317
310
 
318
311
 	if (max_raw_minors < 1 || max_raw_minors > 65536) {
319
-		printk(KERN_WARNING "raw: invalid max_raw_minors (must be"
320
-			" between 1 and 65536), using %d\n", MAX_RAW_MINORS);
321
-		max_raw_minors = MAX_RAW_MINORS;
312
+		pr_warn("raw: invalid max_raw_minors (must be between 1 and 65536), using %d\n",
313
+			CONFIG_MAX_RAW_DEVS);
314
+		max_raw_minors = CONFIG_MAX_RAW_DEVS;
322
315
 	}
323
316
 
324
317
 	raw_devices = vzalloc(array_size(max_raw_minors,