> Meelis Roos reported hangs during boot in the longhaul cpufreq driver, after > commit 12478cf0c55 (cpufreq: Make sure frequency transitions are serialized). > The root-cause of this issue is the extra invocation of the > cpufreq_freq_transition_begin() and cpufreq_freq_transition_end() APIs in the > longhaul driver. I found similar issues in the powernow-k6 and powernow-k7 > drivers as well. This patchset fixes the issue in all the 3 drivers and also > adds a debug infrastructure to catch such issues easily. > > Patches 1-4 fix the regression in longhaul, powernow-k6 and powernow-k7 > drivers. (Patch 2 fixes a different bug in powernow-k6, and it is kept as a > separate patch instead of merging it with patch 3, because I felt that it was > a bit subtle and needed attention in a separate patch). > > Patch 5 adds a debug infrastructure to the cpufreq core to catch such problems > more easily in the future. > > > Changes in v2: > -------------- > > * Modified patch 1 to take error returns into account, as pointed out by > Viresh. > * Added patch 2 to fix the existing issue in the powernow-k6 driver, pointed > out by Viresh. > * Added patch 5 to introduce a debug infrastructure to catch such issues > easily. This also works on my VIA EPIA. -- Meelis Roos (mroos@xxxxxxxx) -- To unsubscribe from this list: send the line "unsubscribe cpufreq" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
