Messages in this thread Patch in this message |  | | From | Eduardo Valentin <> | Subject | [PATCH 1/1] thermal: fix cpu_cooling max_level behavior | Date | Wed, 13 Nov 2013 14:11:09 -0400 |
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As per Documentation/thermal/sysfs-api.txt, max_level is an index, not a counter. Thus, in case a CPU has 3 valid frequencies, max_level is expected to be 2, for instance.
The current code makes max_level == number of valid frequencies, which is bogus. This patch fix the cpu_cooling device by ranging max_level properly.
Reported-by: Carlos Hernandez <ceh@ti.com> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> --- drivers/thermal/cpu_cooling.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
diff --git a/drivers/thermal/cpu_cooling.c b/drivers/thermal/cpu_cooling.c index d179028..d0f8f8b5 100644 --- a/drivers/thermal/cpu_cooling.c +++ b/drivers/thermal/cpu_cooling.c @@ -173,6 +173,8 @@ static int get_property(unsigned int cpu, unsigned long input, freq = table[i].frequency; max_level++; } + /* max_level is an index, not a counter */ + max_level--; /* get max level */ if (property == GET_MAXL) { @@ -181,7 +183,7 @@ static int get_property(unsigned int cpu, unsigned long input, } if (property == GET_FREQ) - level = descend ? input : (max_level - input - 1); + level = descend ? input : (max_level - input); for (i = 0, j = 0; table[i].frequency != CPUFREQ_TABLE_END; i++) { /* ignore invalid entry */ @@ -197,7 +199,7 @@ static int get_property(unsigned int cpu, unsigned long input, if (property == GET_LEVEL && (unsigned int)input == freq) { /* get level by frequency */ - *output = descend ? j : (max_level - j - 1); + *output = descend ? j : (max_level - j); return 0; } if (property == GET_FREQ && level == j) { -- 1.8.2.1.342.gfa7285d
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