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authorSrivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com>2014-04-29 00:24:58 +0530
committerRafael J. Wysocki <rafael.j.wysocki@intel.com>2014-04-29 01:22:54 +0200
commit8997b185119966c62c6e95e7b010b4060407e358 (patch)
tree2085f1f7ca82fdb9d143f2d135929e4eb074fb3c /drivers/cpufreq
parent3221e55b72359c44ed75afbcf707710af5bc2d59 (diff)
downloadop-kernel-dev-8997b185119966c62c6e95e7b010b4060407e358.zip
op-kernel-dev-8997b185119966c62c6e95e7b010b4060407e358.tar.gz
cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
During frequency transitions, the cpufreq core takes the responsibility of invoking cpufreq_freq_transition_begin() and cpufreq_freq_transition_end() for those cpufreq drivers that define the ->target_index callback but don't set the ASYNC_NOTIFICATION flag. The powernow-k7 cpufreq driver falls under this category, but this driver was invoking the _begin() and _end() APIs itself around frequency transitions, which led to double invocation of the _begin() API. The _begin API makes contending callers wait until the previous invocation is complete. Hence, the powernow-k7 driver ended up waiting on itself, leading to system hangs during boot. Fix this by removing the calls to the _begin() and _end() APIs from the powernow-k7 driver, since they rightly belong to the cpufreq core. Fixes: 12478cf0c55e (cpufreq: Make sure frequency transitions are serialized) Signed-off-by: Srivatsa S. Bhat <srivatsa.bhat@linux.vnet.ibm.com> Acked-by: Viresh Kumar <viresh.kumar@linaro.org> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
Diffstat (limited to 'drivers/cpufreq')
-rw-r--r--drivers/cpufreq/powernow-k7.c4
1 files changed, 0 insertions, 4 deletions
diff --git a/drivers/cpufreq/powernow-k7.c b/drivers/cpufreq/powernow-k7.c
index f911645..e61e224 100644
--- a/drivers/cpufreq/powernow-k7.c
+++ b/drivers/cpufreq/powernow-k7.c
@@ -269,8 +269,6 @@ static int powernow_target(struct cpufreq_policy *policy, unsigned int index)
freqs.new = powernow_table[index].frequency;
- cpufreq_freq_transition_begin(policy, &freqs);
-
/* Now do the magic poking into the MSRs. */
if (have_a0 == 1) /* A0 errata 5 */
@@ -290,8 +288,6 @@ static int powernow_target(struct cpufreq_policy *policy, unsigned int index)
if (have_a0 == 1)
local_irq_enable();
- cpufreq_freq_transition_end(policy, &freqs, 0);
-
return 0;
}
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