linux-kernel - [PATCH 3.16 022/217] mtd: map: fix .set

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Date:	Wed, 27 Apr 2016 01:02:21 +0200
From:	Ben Hutchings <ben@...adent.org.uk>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:	akpm@...ux-foundation.org,
	"Brian Norris" <computersforpeace@...il.com>,
	"Russell King" <linux@....linux.org.uk>,
	"Paul Parsons" <lost.distance@...oo.com>,
	"Linus Walleij" <linus.walleij@...aro.org>
Subject: [PATCH 3.16 022/217] mtd: map: fix .set_vpp() documentation

3.16.35-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Linus Walleij <linus.walleij@...aro.org>

commit 95a001f22b1c5717eafd500a43832249ddd93662 upstream.

As of commit 876fe76d793d03077eb61ba3afab4a383f46c554
"mtd: maps: physmap: Add reference counter to set_vpp()"
the comment in the header file is incorrect and misleading.
Fix it up.

Cc: Russell King <linux@....linux.org.uk>
Cc: Paul Parsons <lost.distance@...oo.com>
Fixes: 876fe76d793d ("mtd: maps: physmap: Add reference counter to set_vpp()")
Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
Signed-off-by: Brian Norris <computersforpeace@...il.com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 include/linux/mtd/map.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

--- a/include/linux/mtd/map.h
+++ b/include/linux/mtd/map.h
@@ -238,8 +238,11 @@ struct map_info {
 	   If there is no cache to care about this can be set to NULL. */
 	void (*inval_cache)(struct map_info *, unsigned long, ssize_t);
 
-	/* set_vpp() must handle being reentered -- enable, enable, disable
-	   must leave it enabled. */
+	/* This will be called with 1 as parameter when the first map user
+	 * needs VPP, and called with 0 when the last user exits. The map
+	 * core maintains a reference counter, and assumes that VPP is a
+	 * global resource applying to all mapped flash chips on the system.
+	 */
 	void (*set_vpp)(struct map_info *, int);
 
 	unsigned long pfow_base;