| Message ID | 517AEFC0.2010301@ti.com (mailing list archive) |
|---|---|
| State | Superseded, archived |
| Delegated to: | Zhang Rui |
| Headers | show |
Hi Valentin, Any further thoughts? Thanks, Srinivas On 04/26/2013 04:32 PM, Srinivas Pandruvada wrote: > Hi Valentin, > > I planned to use that before , but it will change the semantics here. > > - Here comparison is using a case in-sensitive version, sysfs_streq is > case sensitive. > - I am not sure if there is any protection for length. If we pass a > more than THERM_NAME_LENGTH string, then whether sysfs_streq can > handle. so we need to pre-check for length. > - some stupid echo command with CRLF, will still fail > I see that some other syfs string write (eg. cpufreq.c) decided not to > use sysfs_streq, may be historical. > > Thanks, > Srinivas > > > On 04/26/2013 02:21 PM, Eduardo Valentin wrote: >> Hello Srinivas, >> >> On 26-04-2013 16:35, Srinivas Pandruvada wrote: >>> Setting policy results in invalid value error. >>> >echo "step_wise" > policy >>> >echo: write error: Invalid argument >>> >>> Need clean up of the buffer which "echo" may add based on the >>> arguments, before comparing aganist list of governor names. >>> >>> Signed-off-by: Srinivas Pandruvada >>> <srinivas.pandruvada@linux.intel.com> >>> --- >>> drivers/thermal/thermal_core.c | 19 +++++++++++++++---- >>> 1 file changed, 15 insertions(+), 4 deletions(-) >>> >>> diff --git a/drivers/thermal/thermal_core.c >>> b/drivers/thermal/thermal_core.c >>> index 4cdc3e3..ed6904f 100644 >>> --- a/drivers/thermal/thermal_core.c >>> +++ b/drivers/thermal/thermal_core.c >>> @@ -696,16 +696,27 @@ static ssize_t >>> policy_store(struct device *dev, struct device_attribute *attr, >>> const char *buf, size_t count) >>> { >>> - int ret = -EINVAL; >>> + int ret; >>> struct thermal_zone_device *tz = to_thermal_zone(dev); >>> struct thermal_governor *gov; >>> + char str_gov[THERMAL_NAME_LENGTH]; >>> + char format[6]; /* enough for 3 digit format width */ >>> + >>> + ret = snprintf(format, sizeof(format), "%%%ds", >>> + THERMAL_NAME_LENGTH - 1); >>> + if (ret < 0) >>> + return ret; >>> + ret = sscanf(buf, format, str_gov); >>> + if (ret <= 0) >>> + return -EINVAL; >> >> >> Is this due to trainling \n? Why not using sysfs_streq()? I believe >> it is better approach. Can you please check if the following solves >> the issue? >> >> https://gitorious.org/thermal-framework/thermal-framework/commit/810a33a629b40adfa92a164883281bbdfad80516 >> >> >> commit 810a33a629b40adfa92a164883281bbdfad80516 >> Author: Eduardo Valentin <eduardo.valentin@ti.com> >> Date: Fri Apr 26 17:12:30 2013 -0400 >> >> thermal: better string treatment while finding governors >> >> To avoid returning error value just because of trailing >> \n, this patch changes the function to find governors >> by name to use sysfs_streq(). >> >> Signed-off-by: Eduardo Valentin <eduardo.valentin@ti.com> >> >> diff --git a/drivers/thermal/thermal_core.c >> b/drivers/thermal/thermal_core.c >> index f36cd44..08ea62c 100644 >> --- a/drivers/thermal/thermal_core.c >> +++ b/drivers/thermal/thermal_core.c >> @@ -58,7 +58,7 @@ static struct thermal_governor >> *__find_governor(const char *name) >> struct thermal_governor *pos; >> >> list_for_each_entry(pos, &thermal_governor_list, governor_list) >> - if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH)) >> + if (sysfs_streq(name, pos->name)) >> return pos; >> >> return NULL; >> >>> >>> mutex_lock(&thermal_governor_lock); >>> >>> - gov = __find_governor(buf); >>> - if (!gov) >>> + gov = __find_governor(str_gov); >>> + if (!gov) { >>> + ret = -EINVAL; >>> goto exit; >>> - >>> + } >>> tz->governor = gov; >>> ret = count; >>> >>> >> >> > > -- To unsubscribe from this list: send the line "unsubscribe linux-pm" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
diff --git a/drivers/thermal/thermal_core.c b/drivers/thermal/thermal_core.c index f36cd44..08ea62c 100644 --- a/drivers/thermal/thermal_core.c +++ b/drivers/thermal/thermal_core.c @@ -58,7 +58,7 @@ static struct thermal_governor *__find_governor(const char *name) struct thermal_governor *pos; list_for_each_entry(pos, &thermal_governor_list, governor_list) - if (!strnicmp(name, pos->name, THERMAL_NAME_LENGTH)) + if (sysfs_streq(name, pos->name)) return pos;