target/linux/ar7/patches-3.18/101-MIPS-AR7-allow-NULL-clock-for-clk_get_rate.patch

   1 From patchwork Tue Jul 18 10:17:26 2017
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   5 Subject: [5/9] MIPS: AR7: allow NULL clock for clk_get_rate
   6 X-Patchwork-Submitter: Jonas Gorski <jonas.gorski@gmail.com>
   7 X-Patchwork-Id: 16775
   8 Message-Id: <20170718101730.2541-6-jonas.gorski@gmail.com>
   9 To: unlisted-recipients:; (no To-header on input)
  10 Cc: Ralf Baechle <ralf@linux-mips.org>,
  11  Paul Gortmaker <paul.gortmaker@windriver.com>,
  12  James Hogan <james.hogan@imgtec.com>,
  13  linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
  14 Date: Tue, 18 Jul 2017 12:17:26 +0200
  15 From: Jonas Gorski <jonas.gorski@gmail.com>
  16 List-Id: linux-mips <linux-mips.eddie.linux-mips.org>
  17
  18 Make the behaviour of clk_get_rate consistent with common clk's
  19 clk_get_rate by accepting NULL clocks as parameter. Some device
  20 drivers rely on this, and will cause an OOPS otherwise.
  21
  22 Fixes: 780019ddf02f ("MIPS: AR7: Implement clock API")
  23 Cc: Ralf Baechle <ralf@linux-mips.org>
  24 Cc: Paul Gortmaker <paul.gortmaker@windriver.com>
  25 Cc: James Hogan <james.hogan@imgtec.com>
  26 Cc: linux-mips@linux-mips.org
  27 Cc: linux-kernel@vger.kernel.org
  28 Reported-by: Mathias Kresin <dev@kresin.me>
  29 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  30 ---
  31  arch/mips/ar7/clock.c | 3 +++
  32  1 file changed, 3 insertions(+)
  33
  34 --- a/arch/mips/ar7/clock.c
  35 +++ b/arch/mips/ar7/clock.c
  36 @@ -430,6 +430,9 @@ EXPORT_SYMBOL(clk_disable);
  37
  38  unsigned long clk_get_rate(struct clk *clk)
  39  {
  40 +       if (!clk)
  41 +               return 0;
  42 +
  43         return clk->rate;
  44  }
  45  EXPORT_SYMBOL(clk_get_rate);