target/linux/brcm63xx/patches-4.4/111-MIPS-BCM63XX-allow-NULL-clock-for-clk_get_rate.patch

   1 From patchwork Tue Jul 18 10:17:27 2017
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   5 Subject: [6/9] MIPS: BCM63XX: allow NULL clock for clk_get_rate
   6 X-Patchwork-Submitter: Jonas Gorski <jonas.gorski@gmail.com>
   7 X-Patchwork-Id: 16776
   8 Message-Id: <20170718101730.2541-7-jonas.gorski@gmail.com>
   9 To: unlisted-recipients:; (no To-header on input)
  10 Cc: Ralf Baechle <ralf@linux-mips.org>,
  11  Florian Fainelli <f.fainelli@gmail.com>,
  12  bcm-kernel-feedback-list@broadcom.com,
  13  James Hogan <james.hogan@imgtec.com>,
  14  linux-mips@linux-mips.org, linux-kernel@vger.kernel.org
  15 Date: Tue, 18 Jul 2017 12:17:27 +0200
  16 From: Jonas Gorski <jonas.gorski@gmail.com>
  17 List-Id: linux-mips <linux-mips.eddie.linux-mips.org>
  18
  19 Make the behaviour of clk_get_rate consistent with common clk's
  20 clk_get_rate by accepting NULL clocks as parameter. Some device
  21 drivers rely on this, and will cause an OOPS otherwise.
  22
  23 Fixes: e7300d04bd08 ("MIPS: BCM63xx: Add support for the Broadcom BCM63xx family of SOCs.")
  24 Cc: Ralf Baechle <ralf@linux-mips.org>
  25 Cc: Florian Fainelli <f.fainelli@gmail.com>
  26 Cc: bcm-kernel-feedback-list@broadcom.com
  27 Cc: James Hogan <james.hogan@imgtec.com>
  28 Cc: linux-mips@linux-mips.org
  29 Cc: linux-kernel@vger.kernel.org
  30 Reported-by: Mathias Kresin <dev@kresin.me>
  31 Signed-off-by: Jonas Gorski <jonas.gorski@gmail.com>
  32 Reviewed-by: Florian Fainelli <f.fainelli@gmail.com>
  33 ---
  34  arch/mips/bcm63xx/clk.c | 3 +++
  35  1 file changed, 3 insertions(+)
  36
  37 --- a/arch/mips/bcm63xx/clk.c
  38 +++ b/arch/mips/bcm63xx/clk.c
  39 @@ -345,6 +345,9 @@ EXPORT_SYMBOL(clk_disable);
  40
  41  unsigned long clk_get_rate(struct clk *clk)
  42  {
  43 +       if (!clk)
  44 +               return 0;
  45 +
  46         return clk->rate;
  47  }
  48