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PM / Domains: Don't treat zero found compatible idle states as an error 

Instead of returning -EINVAL from of_genpd_parse_idle_states() in case none
compatible states was found, let's return 0 to indicate success. Assign
also the out-parameter *states to NULL and *n to 0, to indicate to the
caller that zero states have been found/allocated.

This enables the caller of of_genpd_parse_idle_states() to easier act on
the returned error code.

Signed-off-by: Ulf Hansson <ulf.hansson@linaro.org>
Reviewed-by: Lina Iyer <ilina@codeaurora.org>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@intel.com>
This commit is contained in:
Ulf Hansson 2018-10-03 16:38:14 +02:00 committed by Rafael J. Wysocki
parent 35a7f35ad1
commit 2c36168480
1 changed files with 10 additions and 4 deletions
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14
drivers/base/power/domain.c
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@ -2478,8 +2478,8 @@ static int genpd_iterate_idle_states(struct device_node *dn,
*
* Returns the device states parsed from the OF node. The memory for the states
* is allocated by this function and is the responsibility of the caller to
* free the memory after use. If no domain idle states is found it returns
* -EINVAL and in case of errors, a negative error code.
* free the memory after use. If any or zero compatible domain idle states is
* found it returns 0 and in case of errors, a negative error code is returned.
*/
int of_genpd_parse_idle_states(struct device_node *dn,
struct genpd_power_state **states, int *n)
@ -2488,8 +2488,14 @@ int of_genpd_parse_idle_states(struct device_node *dn,
int ret;
ret = genpd_iterate_idle_states(dn, NULL);
if (ret <= 0)
return ret < 0 ? ret : -EINVAL;
if (ret < 0)
return ret;
if (!ret) {
*states = NULL;
*n = 0;
return 0;
}
st = kcalloc(ret, sizeof(*st), GFP_KERNEL);
if (!st)