linux-kernel - [PATCH 4.2.y-ckt 184/218] mtd: map: fix .set

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Message-Id: <1459455431-12687-185-git-send-email-kamal@canonical.com>
Date:	Thu, 31 Mar 2016 13:16:37 -0700
From:	Kamal Mostafa <kamal@...onical.com>
To:	linux-kernel@...r.kernel.org, stable@...r.kernel.org,
	kernel-team@...ts.ubuntu.com
Cc:	Russell King <linux@....linux.org.uk>,
	Paul Parsons <lost.distance@...oo.com>,
	Linus Walleij <linus.walleij@...aro.org>,
	Brian Norris <computersforpeace@...il.com>,
	Kamal Mostafa <kamal@...onical.com>
Subject: [PATCH 4.2.y-ckt 184/218] mtd: map: fix .set_vpp() documentation

4.2.8-ckt7 -stable review patch.  If anyone has any objections, please let me know.

---8<------------------------------------------------------------

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: Kamal Mostafa <kamal@...onical.com>
---
 include/linux/mtd/map.h | 7 +++++--
 1 file changed, 5 insertions(+), 2 deletions(-)

diff --git a/include/linux/mtd/map.h b/include/linux/mtd/map.h
index 29975c7..d013559 100644
--- 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;
-- 
2.7.4