[PATCH] lscpu: skip frequencies of 0 MHz when getting minmhz

read_mhz() sets cpu->mhz_min_freq from /sys/devices/system/cpu/cpuN/
cpufreq/cpuinfo_min_freq. The file read fails if cpuN is offline and
cpu->mhz_min_freq is left as 0. 0 MHz is treated as invalid frequency.

lsblk_cputype_get_minmhz() iterates through all possible CPUs to find the
minimum frequency. If one or more CPUs are offline, the minimum frequency
will be 0. This is reflected in the output of lscpu:

	$ ./lscpu | grep min
	CPU min MHz:                        0.0000

Ignore 0-MHz frequencies to find the actual minimum frequency:

	$ ./lscpu | grep min
	CPU min MHz:                     1200.0000

Reported-by: Thangamani Krishnan <[email protected]>
Signed-off-by: Ricardo Neri <[email protected]>
---
 sys-utils/lscpu-topology.c | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/sys-utils/lscpu-topology.c b/sys-utils/lscpu-topology.c
index 547a3aca0..36a217bc7 100644
--- a/sys-utils/lscpu-topology.c
+++ b/sys-utils/lscpu-topology.c
@@ -660,6 +660,8 @@ float lsblk_cputype_get_minmhz(struct lscpu_cxt *cxt, struct lscpu_cputype *ct)
 
 		if (!cpu || cpu->type != ct || !is_cpu_present(cxt, cpu))
 			continue;
+		if (!cpu->mhz_min_freq)
+			continue;
 		if (res < 0.0 || cpu->mhz_min_freq < res)
 			res = cpu->mhz_min_freq;
 	}
-- 
2.34.1