https://github.com/torvalds/linux
Revision 8997b185119966c62c6e95e7b010b4060407e358 authored by Srivatsa S. Bhat on 28 April 2014, 18:54:58 UTC, committed by Rafael J. Wysocki on 28 April 2014, 23:22:54 UTC
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>
1 parent 3221e55
Tip revision: 8997b185119966c62c6e95e7b010b4060407e358 authored by Srivatsa S. Bhat on 28 April 2014, 18:54:58 UTC
cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
cpufreq: powernow-k7: Fix double invocation of cpufreq_freq_transition_begin/end
Tip revision: 8997b18
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bcm | ||
blackfin | ||
cirrus | ||
codecs | ||
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dwc | ||
fsl | ||
generic | ||
intel | ||
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kirkwood | ||
mxs | ||
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omap | ||
pxa | ||
s6000 | ||
samsung | ||
sh | ||
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spear | ||
tegra | ||
txx9 | ||
ux500 | ||
Kconfig | -rw-r--r-- | 1.7 KB |
Makefile | -rw-r--r-- | 1.1 KB |
soc-cache.c | -rw-r--r-- | 4.6 KB |
soc-compress.c | -rw-r--r-- | 19.7 KB |
soc-core.c | -rw-r--r-- | 119.8 KB |
soc-dapm.c | -rw-r--r-- | 97.1 KB |
soc-devres.c | -rw-r--r-- | 3.1 KB |
soc-generic-dmaengine-pcm.c | -rw-r--r-- | 12.2 KB |
soc-io.c | -rw-r--r-- | 2.3 KB |
soc-jack.c | -rw-r--r-- | 9.6 KB |
soc-pcm.c | -rw-r--r-- | 70.7 KB |
soc-utils.c | -rw-r--r-- | 4.3 KB |
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