target/linux/ramips/patches-4.4/0100-MIPS-ralink-allow-NULL-clock-for-clk_get_rate.patch

   1 From patchwork Tue Jul 18 10:17:29 2017
   2 Content-Type: text/plain; charset="utf-8"
   3 MIME-Version: 1.0
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   5 Subject: [8/9] MIPS: ralink: allow NULL clock for clk_get_rate
   6 X-Patchwork-Submitter: Jonas Gorski <jonas.gorski@gmail.com>
   7 X-Patchwork-Id: 16778
   8 Message-Id: <20170718101730.2541-9-jonas.gorski@gmail.com>
   9 To: unlisted-recipients:; (no To-header on input)
  10 Cc: John Crispin <john@phrozen.org>,
  11  Ralf Baechle <ralf@linux-mips.org>, linux-mips@linux-mips.org,
  12  linux-kernel@vger.kernel.org
  13 Date: Tue, 18 Jul 2017 12:17:29 +0200
  14 From: Jonas Gorski <jonas.gorski@gmail.com>
  15 List-Id: linux-mips <linux-mips.eddie.linux-mips.org>
  16
  17 Make the behaviour of clk_get_rate consistent with common clk's
  18 clk_get_rate by accepting NULL clocks as parameter. Some device
  19 drivers rely on this, and will cause an OOPS otherwise.
  20
  21 Fixes: 3f0a06b0368d ("MIPS: ralink: adds clkdev code")
  22 Cc: John Crispin <john@phrozen.org>
  23 Cc: Ralf Baechle <ralf@linux-mips.org>
  24 Cc: linux-mips@linux-mips.org
  25 Cc: linux-kernel@vger.kernel.org
  26 Reported-by: Mathias Kresin <dev@kresin.me>
  27 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  28 ---
  29  arch/mips/ralink/clk.c | 3 +++
  30  1 file changed, 3 insertions(+)
  31
  32 --- a/arch/mips/ralink/clk.c
  33 +++ b/arch/mips/ralink/clk.c
  34 @@ -52,6 +52,9 @@ EXPORT_SYMBOL_GPL(clk_disable);
  35
  36  unsigned long clk_get_rate(struct clk *clk)
  37  {
  38 +       if (!clk)
  39 +               return 0;
  40 +
  41         return clk->rate;
  42  }
  43  EXPORT_SYMBOL_GPL(clk_get_rate);