Revision b5d281f6c16dd432b618bdfd36ddba1a58d5b603 authored by Christian Marangi on 19 June 2022, 22:03:51 UTC, committed by Chanwoo Choi on 29 June 2022, 20:11:17 UTC
On a devfreq PROBE_DEFER, the freq_table in the driver profile struct,
is never reset and may be leaved in an undefined state.
This comes from the fact that we store the freq_table in the driver
profile struct that is commonly defined as static and not reset on
PROBE_DEFER.
We currently skip the reinit of the freq_table if we found
it's already defined since a driver may declare his own freq_table.
This logic is flawed in the case devfreq core generate a freq_table, set
it in the profile struct and then PROBE_DEFER, freeing the freq_table.
In this case devfreq will found a NOT NULL freq_table that has been
freed, skip the freq_table generation and probe the driver based on the
wrong table.
To fix this and correctly handle PROBE_DEFER, use a local freq_table and
max_state in the devfreq struct and never modify the freq_table present
in the profile struct if it does provide it.
Fixes: 0ec09ac2cebe ("PM / devfreq: Set the freq_table of devfreq device")
Cc: stable@vger.kernel.org
Signed-off-by: Christian Marangi <ansuelsmth@gmail.com>
Signed-off-by: Chanwoo Choi <cw00.choi@samsung.com>
1 parent f44b799
| File | Mode | Size |
|---|---|---|
| coresight | ||
| postprocess | ||
| boottime-trace.rst | -rw-r--r-- | 10.2 KB |
| events-kmem.rst | -rw-r--r-- | 5.4 KB |
| events-msr.rst | -rw-r--r-- | 783 bytes |
| events-nmi.rst | -rw-r--r-- | 1.6 KB |
| events-power.rst | -rw-r--r-- | 3.4 KB |
| events.rst | -rw-r--r-- | 39.8 KB |
| fprobe.rst | -rw-r--r-- | 5.7 KB |
| ftrace-design.rst | -rw-r--r-- | 14.7 KB |
| ftrace-uses.rst | -rw-r--r-- | 11.9 KB |
| ftrace.rst | -rw-r--r-- | 131.0 KB |
| function-graph-fold.vim | -rw-r--r-- | 1.3 KB |
| histogram-design.rst | -rw-r--r-- | 87.1 KB |
| histogram.rst | -rw-r--r-- | 153.6 KB |
| hwlat_detector.rst | -rw-r--r-- | 4.0 KB |
| index.rst | -rw-r--r-- | 516 bytes |
| intel_th.rst | -rw-r--r-- | 6.0 KB |
| kprobes.rst | -rw-r--r-- | 29.6 KB |
| kprobetrace.rst | -rw-r--r-- | 10.9 KB |
| mmiotrace.rst | -rw-r--r-- | 6.8 KB |
| osnoise-tracer.rst | -rw-r--r-- | 8.3 KB |
| ring-buffer-design.rst | -rw-r--r-- | 30.6 KB |
| stm.rst | -rw-r--r-- | 6.6 KB |
| sys-t.rst | -rw-r--r-- | 2.1 KB |
| timerlat-tracer.rst | -rw-r--r-- | 8.7 KB |
| tracepoint-analysis.rst | -rw-r--r-- | 12.1 KB |
| tracepoints.rst | -rw-r--r-- | 6.0 KB |
| uprobetracer.rst | -rw-r--r-- | 7.2 KB |
| user_events.rst | -rw-r--r-- | 6.8 KB |
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