mtd: partitions: remove kmemdup()

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Gitweb:     http://git.infradead.org/?p=mtd-2.6.git;a=commit;h=c42c2710d64381fd48d36b278e0744aa683d93fe
Commit:     c42c2710d64381fd48d36b278e0744aa683d93fe
Parent:     5531ae4818fb04b9a30f87099f44595c1786f518
Author:     Brian Norris <computersforpeace at gmail.com>
AuthorDate: Fri Dec 4 15:25:16 2015 -0800
Committer:  Brian Norris <computersforpeace at gmail.com>
CommitDate: Wed Dec 9 10:22:06 2015 -0800

    mtd: partitions: remove kmemdup()
    
    The use of kmemdup() complicates the error handling a bit. We don't
    actually need to allocate new memory, since this reference is treated as
    const, and it is copied into new memory by the partition registration
    code anyway. So remove it.
    
    Signed-off-by: Brian Norris <computersforpeace at gmail.com>
    Reviewed-by: Boris Brezillon <boris.brezillon at free-electrons.com>
---
 drivers/mtd/mtdcore.c | 16 +++++++---------
 drivers/mtd/mtdcore.h |  2 +-
 drivers/mtd/mtdpart.c |  2 +-
 3 files changed, 9 insertions(+), 11 deletions(-)

diff --git a/drivers/mtd/mtdcore.c b/drivers/mtd/mtdcore.c
index 62f83b0..868ee52 100644
--- a/drivers/mtd/mtdcore.c
+++ b/drivers/mtd/mtdcore.c
@@ -532,7 +532,7 @@ out_error:
 }
 
 static int mtd_add_device_partitions(struct mtd_info *mtd,
-				     struct mtd_partition *real_parts,
+				     const struct mtd_partition *real_parts,
 				     int nbparts)
 {
 	int ret;
@@ -589,16 +589,12 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 			      int nr_parts)
 {
 	int ret;
-	struct mtd_partition *real_parts = NULL;
+	const struct mtd_partition *real_parts = NULL;
 
 	ret = parse_mtd_partitions(mtd, types, &real_parts, parser_data);
 	if (ret <= 0 && nr_parts && parts) {
-		real_parts = kmemdup(parts, sizeof(*parts) * nr_parts,
-				     GFP_KERNEL);
-		if (!real_parts)
-			ret = -ENOMEM;
-		else
-			ret = nr_parts;
+		real_parts = parts;
+		ret = nr_parts;
 	}
 	/* Didn't come up with either parsed OR fallback partitions */
 	if (ret < 0) {
@@ -628,7 +624,9 @@ int mtd_device_parse_register(struct mtd_info *mtd, const char * const *types,
 	}
 
 out:
-	kfree(real_parts);
+	/* Cleanup any parsed partitions */
+	if (real_parts != parts)
+		kfree(real_parts);
 	return ret;
 }
 EXPORT_SYMBOL_GPL(mtd_device_parse_register);
diff --git a/drivers/mtd/mtdcore.h b/drivers/mtd/mtdcore.h
index 7b03533..537ec66 100644
--- a/drivers/mtd/mtdcore.h
+++ b/drivers/mtd/mtdcore.h
@@ -11,7 +11,7 @@ int del_mtd_device(struct mtd_info *mtd);
 int add_mtd_partitions(struct mtd_info *, const struct mtd_partition *, int);
 int del_mtd_partitions(struct mtd_info *);
 int parse_mtd_partitions(struct mtd_info *master, const char * const *types,
-			 struct mtd_partition **pparts,
+			 const struct mtd_partition **pparts,
 			 struct mtd_part_parser_data *data);
 
 int __init init_mtdchar(void);
diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 4a660ae..898999c 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -760,7 +760,7 @@ static const char * const default_mtd_part_types[] = {
  *   point to an array containing this number of &struct mtd_info objects.
  */
 int parse_mtd_partitions(struct mtd_info *master, const char *const *types,
-			 struct mtd_partition **pparts,
+			 const struct mtd_partition **pparts,
 			 struct mtd_part_parser_data *data)
 {
 	struct mtd_part_parser *parser;