linux-kernel - [PATCH 03/15] genhd: Return error from blk_register

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Date:	Wed, 17 Aug 2016 15:15:03 +0800
From:	Fam Zheng <famz@...hat.com>
To:	linux-kernel@...r.kernel.org
Cc:	linux-nvme@...ts.infradead.org,
	Keith Busch <keith.busch@...el.com>,
	Michael Ellerman <mpe@...erman.id.au>,
	Benjamin Herrenschmidt <benh@...nel.crashing.org>,
	linuxppc-dev@...ts.ozlabs.org,
	"Michael S. Tsirkin" <mst@...hat.com>, linux-block@...r.kernel.org,
	Brian Norris <computersforpeace@...il.com>,
	Paul Mackerras <paulus@...ba.org>,
	linux-mtd@...ts.infradead.org, "Ed L. Cashin" <ed.cashin@....org>,
	Jens Axboe <axboe@...nel.dk>, Minchan Kim <minchan@...nel.org>,
	virtualization@...ts.linux-foundation.org,
	Sergey Senozhatsky <sergey.senozhatsky.work@...il.com>,
	Nitin Gupta <ngupta@...are.org>,
	David Woodhouse <dwmw2@...radead.org>
Subject: [PATCH 03/15] genhd: Return error from blk_register_region

blk_register_region can fail (-ENOMEM), return the error to the caller.

Signed-off-by: Fam Zheng <famz@...hat.com>
---
 block/genhd.c         |  4 ++--
 include/linux/genhd.h | 10 +++++-----
 2 files changed, 7 insertions(+), 7 deletions(-)

diff --git a/block/genhd.c b/block/genhd.c
index 3dcecaa..8c7510d 100644
--- a/block/genhd.c
+++ b/block/genhd.c
@@ -474,11 +474,11 @@ static char *bdevt_str(dev_t devt, char *buf)
  * range must be nonzero
  * The hash chain is sorted on range, so that subranges can override.
  */
-void blk_register_region(dev_t devt, unsigned long range, struct module *module,
+int blk_register_region(dev_t devt, unsigned long range, struct module *module,
 			 struct kobject *(*probe)(dev_t, int *, void *),
 			 int (*lock)(dev_t, void *), void *data)
 {
-	kobj_map(bdev_map, devt, range, module, probe, lock, data);
+	return kobj_map(bdev_map, devt, range, module, probe, lock, data);
 }
 
 EXPORT_SYMBOL(blk_register_region);
diff --git a/include/linux/genhd.h b/include/linux/genhd.h
index 889b1bb..b6fd666 100644
--- a/include/linux/genhd.h
+++ b/include/linux/genhd.h
@@ -617,11 +617,11 @@ extern struct gendisk *alloc_disk_node(int minors, int node_id);
 extern struct gendisk *alloc_disk(int minors);
 extern struct kobject *get_disk(struct gendisk *disk);
 extern void put_disk(struct gendisk *disk);
-extern void blk_register_region(dev_t devt, unsigned long range,
-			struct module *module,
-			struct kobject *(*probe)(dev_t, int *, void *),
-			int (*lock)(dev_t, void *),
-			void *data);
+extern int blk_register_region(dev_t devt, unsigned long range,
+			       struct module *module,
+			       struct kobject *(*probe)(dev_t, int *, void *),
+			       int (*lock)(dev_t, void *),
+			       void *data);
 extern void blk_unregister_region(dev_t devt, unsigned long range);
 
 extern ssize_t part_size_show(struct device *dev,
-- 
2.7.4