[dpdk-dev] [PATCH v4 1/2] power: fix pstate base frequency handling

[Anatoly Burakov]

Previous fix for base frequency handling in pstate mode introduced a
couple of issues:

- When base_frequency file does not exist, it simply bails out because
  of what appears to be accidental addition of FOPEN_OR_ERR_RET. This is
  incorrect, as absence of this file is not fatal and is in fact
  expected on kernel versions earlier than 5.3
- When base_frequency file does exist, it gets opened, but never gets
  closed, resulting in a resource leak

Both issues also manifest themselves as Coverity defects (dead code, and
a resource leak), so this fix addresses both.

Fixes: 4db9587bbf72 ("power: check sysfs base frequency")
Cc: david.hunt at intel.com

Coverity issue: 369693
Coverity issue: 369694
Bugzilla ID: 668

Signed-off-by: Anatoly Burakov <anatoly.burakov at intel.com>
---
 lib/librte_power/power_pstate_cpufreq.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/lib/librte_power/power_pstate_cpufreq.c b/lib/librte_power/power_pstate_cpufreq.c
index 8a1fffaed5..c4639e4b8a 100644
--- a/lib/librte_power/power_pstate_cpufreq.c
+++ b/lib/librte_power/power_pstate_cpufreq.c
@@ -206,7 +206,6 @@ power_init_for_setting_freq(struct pstate_power_info *pi)
 			pi->lcore_id);
 
 	f_base = fopen(fullpath_base, "r");
-	FOPEN_OR_ERR_RET(f_base, -1);
 	if (f_base == NULL) {
 		/* No sysfs base_frequency, that's OK, continue without */
 		base_ratio = 0;
@@ -221,6 +220,7 @@ power_init_for_setting_freq(struct pstate_power_info *pi)
 
 		base_ratio = strtoul(buf_base, NULL, POWER_CONVERT_TO_DECIMAL)
 				/ BUS_FREQ;
+		fclose(f_base);
 	}
 
 	/* Add MSR read to detect turbo status */
-- 
2.25.1