ps3: Replace direct file operations by callback

Currently the FLASH database is updated by the kernel using file operations,
meant for userspace only. While this works for us because copy_{from,to}_user()
on powerpc can handle kernel pointers, this is unportable and a bad example.
Replace the file operations by callbacks, registered by the ps3flash driver.

Signed-off-by: Geert Uytterhoeven <Geert.Uytterhoeven@sonycom.com>
Cc: Geoff Levand <geoffrey.levand@am.sony.com>
Acked-by: Geoff Levand <geoffrey.levand@am.sony.com>
Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>

2 files changed, 82 insertions, 63 deletions

diff --git a/arch/powerpc/include/asm/ps3.h b/arch/powerpc/include/asm/ps3.h
index 7660694ab3ca..7f065e178ec4 100644
--- a/arch/powerpc/include/asm/ps3.h
+++ b/arch/powerpc/include/asm/ps3.h
@@ -53,6 +53,13 @@ enum ps3_param_av_multi_out ps3_os_area_get_av_multi_out(void);
 extern u64 ps3_os_area_get_rtc_diff(void);
 extern void ps3_os_area_set_rtc_diff(u64 rtc_diff);
 
+struct ps3_os_area_flash_ops {
+	ssize_t (*read)(void *buf, size_t count, loff_t pos);
+	ssize_t (*write)(const void *buf, size_t count, loff_t pos);
+};
+
+extern void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops);
+
 /* dma routines */
 
 enum ps3_dma_page_size {
diff --git a/arch/powerpc/platforms/ps3/os-area.c b/arch/powerpc/platforms/ps3/os-area.c
index 6e4125d6150f..d6487a9c8019 100644
--- a/arch/powerpc/platforms/ps3/os-area.c
+++ b/arch/powerpc/platforms/ps3/os-area.c
@@ -226,6 +226,44 @@ static struct property property_av_multi_out = {
 	.value = &saved_params.av_multi_out,
 };
 
+
+static DEFINE_MUTEX(os_area_flash_mutex);
+
+static const struct ps3_os_area_flash_ops *os_area_flash_ops;
+
+void ps3_os_area_flash_register(const struct ps3_os_area_flash_ops *ops)
+{
+	mutex_lock(&os_area_flash_mutex);
+	os_area_flash_ops = ops;
+	mutex_unlock(&os_area_flash_mutex);
+}
+EXPORT_SYMBOL_GPL(ps3_os_area_flash_register);
+
+static ssize_t os_area_flash_read(void *buf, size_t count, loff_t pos)
+{
+	ssize_t res = -ENODEV;
+
+	mutex_lock(&os_area_flash_mutex);
+	if (os_area_flash_ops)
+		res = os_area_flash_ops->read(buf, count, pos);
+	mutex_unlock(&os_area_flash_mutex);
+
+	return res;
+}
+
+static ssize_t os_area_flash_write(const void *buf, size_t count, loff_t pos)
+{
+	ssize_t res = -ENODEV;
+
+	mutex_lock(&os_area_flash_mutex);
+	if (os_area_flash_ops)
+		res = os_area_flash_ops->write(buf, count, pos);
+	mutex_unlock(&os_area_flash_mutex);
+
+	return res;
+}
+
+
 /**
  * os_area_set_property - Add or overwrite a saved_params value to the device tree.
  *
@@ -352,12 +390,12 @@ static int db_verify(const struct os_area_db *db)
 	if (memcmp(db->magic_num, OS_AREA_DB_MAGIC_NUM,
 		sizeof(db->magic_num))) {
 		pr_debug("%s:%d magic_num failed\n", __func__, __LINE__);
-		return -1;
+		return -EINVAL;
 	}
 
 	if (db->version != 1) {
 		pr_debug("%s:%d version failed\n", __func__, __LINE__);
-		return -1;
+		return -EINVAL;
 	}
 
 	return 0;
@@ -578,59 +616,48 @@ static void os_area_db_init(struct os_area_db *db)
  *
  */
 
-static void __maybe_unused update_flash_db(void)
+static int update_flash_db(void)
 {
-	int result;
-	int file;
-	off_t offset;
+	const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
+	struct os_area_header *header;
 	ssize_t count;
-	static const unsigned int buf_len = 8 * OS_AREA_SEGMENT_SIZE;
-	const struct os_area_header *header;
+	int error;
+	loff_t pos;
 	struct os_area_db* db;
 
 	/* Read in header and db from flash. */
 
-	file = sys_open("/dev/ps3flash", O_RDWR, 0);
-
-	if (file < 0) {
-		pr_debug("%s:%d sys_open failed\n", __func__, __LINE__);
-		goto fail_open;
-	}
-
 	header = kmalloc(buf_len, GFP_KERNEL);
-
 	if (!header) {
-		pr_debug("%s:%d kmalloc failed\n", __func__, __LINE__);
-		goto fail_malloc;
+		pr_debug("%s: kmalloc failed\n", __func__);
+		return -ENOMEM;
 	}
 
-	offset = sys_lseek(file, 0, SEEK_SET);
-
-	if (offset != 0) {
-		pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
-		goto fail_header_seek;
+	count = os_area_flash_read(header, buf_len, 0);
+	if (count < 0) {
+		pr_debug("%s: os_area_flash_read failed %zd\n", __func__,
+			 count);
+		error = count;
+		goto fail;
 	}
 
-	count = sys_read(file, (char __user *)header, buf_len);
-
-	result = count < OS_AREA_SEGMENT_SIZE || verify_header(header)
-		|| count < header->db_area_offset * OS_AREA_SEGMENT_SIZE;
-
-	if (result) {
-		pr_debug("%s:%d verify_header failed\n", __func__, __LINE__);
+	pos = header->db_area_offset * OS_AREA_SEGMENT_SIZE;
+	if (count < OS_AREA_SEGMENT_SIZE || verify_header(header) ||
+	    count < pos) {
+		pr_debug("%s: verify_header failed\n", __func__);
 		dump_header(header);
-		goto fail_header;
+		error = -EINVAL;
+		goto fail;
 	}
 
 	/* Now got a good db offset and some maybe good db data. */
 
-	db = (void*)header + header->db_area_offset * OS_AREA_SEGMENT_SIZE;
+	db = (void *)header + pos;
 
-	result = db_verify(db);
-
-	if (result) {
-		printk(KERN_NOTICE "%s:%d: Verify of flash database failed, "
-			"formatting.\n", __func__, __LINE__);
+	error = db_verify(db);
+	if (error) {
+		pr_notice("%s: Verify of flash database failed, formatting.\n",
+			  __func__);
 		dump_db(db);
 		os_area_db_init(db);
 	}
@@ -639,29 +666,16 @@ static void __maybe_unused update_flash_db(void)
 
 	db_set_64(db, &os_area_db_id_rtc_diff, saved_params.rtc_diff);
 
-	offset = sys_lseek(file, header->db_area_offset * OS_AREA_SEGMENT_SIZE,
-		SEEK_SET);
-
-	if (offset != header->db_area_offset * OS_AREA_SEGMENT_SIZE) {
-		pr_debug("%s:%d sys_lseek failed\n", __func__, __LINE__);
-		goto fail_db_seek;
-	}
-
-	count = sys_write(file, (const char __user *)db,
-		sizeof(struct os_area_db));
-
+	count = os_area_flash_write(db, sizeof(struct os_area_db), pos);
 	if (count < sizeof(struct os_area_db)) {
-		pr_debug("%s:%d sys_write failed\n", __func__, __LINE__);
+		pr_debug("%s: os_area_flash_write failed %zd\n", __func__,
+			 count);
+		error = count < 0 ? count : -EIO;
 	}
 
-fail_db_seek:
-fail_header:
-fail_header_seek:
+fail:
 	kfree(header);
-fail_malloc:
-	sys_close(file);
-fail_open:
-	return;
+	return error;
 }
 
 /**
@@ -674,11 +688,11 @@ fail_open:
 static void os_area_queue_work_handler(struct work_struct *work)
 {
 	struct device_node *node;
+	int error;
 
 	pr_debug(" -> %s:%d\n", __func__, __LINE__);
 
 	node = of_find_node_by_path("/");
-
 	if (node) {
 		os_area_set_property(node, &property_rtc_diff);
 		of_node_put(node);
@@ -686,12 +700,10 @@ static void os_area_queue_work_handler(struct work_struct *work)
 		pr_debug("%s:%d of_find_node_by_path failed\n",
 			__func__, __LINE__);
 
-#if defined(CONFIG_PS3_FLASH) || defined(CONFIG_PS3_FLASH_MODULE)
-	update_flash_db();
-#else
-	printk(KERN_WARNING "%s:%d: No flash rom driver configured.\n",
-		__func__, __LINE__);
-#endif
+	error = update_flash_db();
+	if (error)
+		pr_warning("%s: Could not update FLASH ROM\n", __func__);
+
 	pr_debug(" <- %s:%d\n", __func__, __LINE__);
 }