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
| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 1.5 KB |
| Makefile | -rw-r--r-- | 1022 bytes |
| byt-rt5640.c | -rw-r--r-- | 5.1 KB |
| haswell.c | -rw-r--r-- | 6.3 KB |
| mfld_machine.c | -rw-r--r-- | 11.7 KB |
| sst-acpi.c | -rw-r--r-- | 7.6 KB |
| sst-baytrail-dsp.c | -rw-r--r-- | 9.4 KB |
| sst-baytrail-ipc.c | -rw-r--r-- | 20.3 KB |
| sst-baytrail-ipc.h | -rw-r--r-- | 2.5 KB |
| sst-baytrail-pcm.c | -rw-r--r-- | 10.8 KB |
| sst-dsp-priv.h | -rw-r--r-- | 8.1 KB |
| sst-dsp.c | -rw-r--r-- | 9.0 KB |
| sst-dsp.h | -rw-r--r-- | 6.6 KB |
| sst-firmware.c | -rw-r--r-- | 14.5 KB |
| sst-haswell-dsp.c | -rw-r--r-- | 13.4 KB |
| sst-haswell-ipc.c | -rw-r--r-- | 43.9 KB |
| sst-haswell-ipc.h | -rw-r--r-- | 14.0 KB |
| sst-haswell-pcm.c | -rw-r--r-- | 23.1 KB |
| sst-mfld-dsp.h | -rw-r--r-- | 3.8 KB |
| sst-mfld-platform.c | -rw-r--r-- | 19.0 KB |
| sst-mfld-platform.h | -rw-r--r-- | 3.8 KB |
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