linux-kernel - [PATCH 4.2 074/110] clkdev: fix clk_add_alias() with a NULL alias device name

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Date:	Fri,  6 Nov 2015 11:19:21 -0800
From:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:	linux-kernel@...r.kernel.org
Cc:	Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
	stable@...r.kernel.org, Aaro Koskinen <aaro.koskinen@....fi>,
	Russell King <rmk+kernel@....linux.org.uk>
Subject: [PATCH 4.2 074/110] clkdev: fix clk_add_alias() with a NULL alias device name

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

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

From: Russell King <rmk+kernel@....linux.org.uk>

commit 625faa6a720d26fc0db9e20b48dc0dfe4c8d8ddf upstream.

clk_add_alias() was not correctly handling the case where alias_dev_name
was NULL: rather than producing an entry with a NULL dev_id pointer,
it would produce a device name of (null).  Fix this.

Fixes: 2568999835d7 ("clkdev: add clkdev_create() helper")
Reported-by: Aaro Koskinen <aaro.koskinen@....fi>
Tested-by: Aaro Koskinen <aaro.koskinen@....fi>
Signed-off-by: Russell King <rmk+kernel@....linux.org.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/clk/clkdev.c |    3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

--- a/drivers/clk/clkdev.c
+++ b/drivers/clk/clkdev.c
@@ -333,7 +333,8 @@ int clk_add_alias(const char *alias, con
 	if (IS_ERR(r))
 		return PTR_ERR(r);
 
-	l = clkdev_create(r, alias, "%s", alias_dev_name);
+	l = clkdev_create(r, alias, alias_dev_name ? "%s" : NULL,
+			  alias_dev_name);
 	clk_put(r);
 
 	return l ? 0 : -ENODEV;


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