]> git.baikalelectronics.ru Git - kernel.git/commit
cpufreq: check cpufreq driver is valid and cpufreq isn't disabled in cpufreq_get()
authorViresh Kumar <viresh.kumar@linaro.org>
Fri, 20 Sep 2013 17:07:31 +0000 (22:37 +0530)
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>
Wed, 25 Sep 2013 01:24:02 +0000 (03:24 +0200)
commit634ab41e0d7573fea564463064669402c03290f5
tree9809302f3fd16f12e722d6eccb0873f767f6f67f
parent77e4da218c67bcfc3fde8b18643ee7fdb3ab5b1b
cpufreq: check cpufreq driver is valid and cpufreq isn't disabled in cpufreq_get()

cpufreq_get() can be called from external drivers which might not be aware if
cpufreq driver is registered or not. And so we should actually check if cpufreq
driver is registered or not and also if cpufreq is active or disabled, at the
beginning of cpufreq_get().

Otherwise call to lock_policy_rwsem_read() might hit BUG_ON(!policy).

Reported-and-tested-by: Linus Walleij <linus.walleij@linaro.org>
Signed-off-by: Viresh Kumar <viresh.kumar@linaro.org>
Reviewed-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
drivers/cpufreq/cpufreq.c