linux-kernel - [PATCH v1 2/2] mtd: Add hooks to call get and put on mtd devices.

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Message-ID: <1470320194-9602-3-git-send-email-Sandeep_Jain@mentor.com>
Date:	Thu, 4 Aug 2016 19:46:34 +0530
From:	Sandeep Jain <Sandeep_Jain@...tor.com>
To:	<dwmw2@...radead.org>, <computersforpeace@...il.com>
CC:	<linux-mtd@...ts.infradead.org>, <linux-kernel@...r.kernel.org>,
	Jim Baxter <jim_baxter@...tor.com>,
	Sandeep Jain <Sandeep_Jain@...tor.com>
Subject: [PATCH v1 2/2] mtd: Add hooks to call get and put on mtd devices.

From: Jim Baxter <jim_baxter@...tor.com>

Add hooks to mtdpart to call _get_device and _put_device,
this allows the mtd devices to perform internal
reference counting if required.

Signed-off-by: Jim Baxter <jim_baxter@...tor.com>
Signed-off-by: Sandeep Jain <Sandeep_Jain@...tor.com>
---
 drivers/mtd/mtdpart.c |   18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/drivers/mtd/mtdpart.c b/drivers/mtd/mtdpart.c
index 1f13e32..adbb1fd 100644
--- a/drivers/mtd/mtdpart.c
+++ b/drivers/mtd/mtdpart.c
@@ -338,6 +338,20 @@ static const struct mtd_ooblayout_ops part_ooblayout_ops = {
 	.free = part_ooblayout_free,
 };
 
+static int part_get_device(struct mtd_info *mtd)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	return part->master->_get_device(part->master);
+}
+
+static void part_put_device(struct mtd_info *mtd)
+{
+	struct mtd_part *part = mtd_to_part(mtd);
+
+	part->master->_put_device(part->master);
+}
+
 static inline void free_partition(struct mtd_part *p)
 {
 	kfree(p->mtd.name);
@@ -463,6 +477,10 @@ static struct mtd_part *allocate_partition(struct mtd_info *master,
 		slave->mtd._block_isbad = part_block_isbad;
 	if (master->_block_markbad)
 		slave->mtd._block_markbad = part_block_markbad;
+	if (master->_get_device)
+		slave->mtd._get_device = part_get_device;
+	if (master->_put_device)
+		slave->mtd._put_device = part_put_device;
 	slave->mtd._erase = part_erase;
 	slave->master = master;
 	slave->offset = part->offset;
-- 
1.7.9.5