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ramips: add NULL clock fix send upstream

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Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.

Fixes: FS#735

Signed-off-by: Mathias Kresin <dev@kresin.me>
This commit is contained in:
Mathias Kresin 2017-07-28 19:38:04 +02:00
parent ea751c972b
commit 0a17d2970a
1 changed files with 43 additions and 0 deletions
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43
target/linux/ramips/patches-4.9/0101-MIPS-ralink-allow-NULL-clock-for-clk_get_rate.patch Normal file
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@ -0,0 +1,43 @@
From patchwork Tue Jul 18 10:17:29 2017
Content-Type: text/plain; charset="utf-8"
MIME-Version: 1.0
Content-Transfer-Encoding: 7bit
Subject: [8/9] MIPS: ralink: allow NULL clock for clk_get_rate
X-Patchwork-Submitter: Jonas Gorski <jonas.gorski@gmail.com>
X-Patchwork-Id: 16778
Message-Id: <20170718101730.2541-9-jonas.gorski@gmail.com>
To: unlisted-recipients:; (no To-header on input)
Cc: John Crispin <john@phrozen.org>,
Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org,
linux-kernel@vger.kernel.org
Date: Tue, 18 Jul 2017 12:17:29 +0200
From: Jonas Gorski <jonas.gorski@gmail.com>
List-Id: linux-mips <linux-mips.eddie.linux-mips.org>
Make the behaviour of clk_get_rate consistent with common clk's
clk_get_rate by accepting NULL clocks as parameter. Some device
drivers rely on this, and will cause an OOPS otherwise.
Fixes: 3f0a06b0368d ("MIPS: ralink: adds clkdev code")
Cc: John Crispin <john@phrozen.org>
Cc: Ralf Baechle <ralf@linux-mips.org>
Cc: linux-mips@linux-mips.org
Cc: linux-kernel@vger.kernel.org
Reported-by: Mathias Kresin <dev@kresin.me>
Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
---
arch/mips/ralink/clk.c | 3 +++
1 file changed, 3 insertions(+)
--- a/arch/mips/ralink/clk.c
+++ b/arch/mips/ralink/clk.c
@@ -52,6 +52,9 @@ EXPORT_SYMBOL_GPL(clk_disable);
unsigned long clk_get_rate(struct clk *clk)
{
+ if (!clk)
+ return 0;
+
return clk->rate;
}
EXPORT_SYMBOL_GPL(clk_get_rate);