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powercap: Adjust printing the constraint name with new line

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The constrain name has limit of size 30, which sometimes might be hit.
When this happens the new line might get lost. Prevent this and set the
max limit for name string length equal 29. This would result is proper
string clamping (when needed) and storing '\n' at index 29 and '\0' at 30,
so similarly as desired originally.

Signed-off-by: Lukasz Luba <lukasz.luba@arm.com>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Lukasz Luba 2020-11-17 13:47:59 +00:00 committed by Rafael J. Wysocki
parent 8a9d881f22
commit b4ba76fb1c
1 changed files with 2 additions and 3 deletions
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5
drivers/powercap/powercap_sys.c
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@ -170,9 +170,8 @@ static ssize_t show_constraint_name(struct device *dev,
if (pconst && pconst->ops && pconst->ops->get_name) {
name = pconst->ops->get_name(power_zone, id);
if (name) {
snprintf(buf, POWERCAP_CONSTRAINT_NAME_LEN,
"%s\n", name);
buf[POWERCAP_CONSTRAINT_NAME_LEN] = '\0';
sprintf(buf, "%.*s\n", POWERCAP_CONSTRAINT_NAME_LEN - 1,
name);
len = strlen(buf);
}
}