One of the warnings gcc issues when building ethtool with -Wall seems to
point to an actual problem:
qsfp.c: In function 'sff8636_show_dom':
qsfp.c:709:57: warning: comparison is always false due to limited range of data
type [-Wtype-limits]
if ((sd.sfp_temp[MCURR] == 0x0) || (sd.sfp_temp[MCURR] == 0xFFFF))
^~
Rather than writing the special value as -1 which would be a bit confusing,
cast 0xFFFF to __s16.
Fixes: a5e73bb05ee4 ("ethtool:QSFP Plus/QSFP28 Diagnostics Information Support")
Signed-off-by: Michal Kubecek <mkube...@suse.cz>
---
qsfp.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/qsfp.c b/qsfp.c
index d196aa1753de..d0774b0445c8 100644
--- a/qsfp.c
+++ b/qsfp.c
@@ -706,7 +706,8 @@ static void sff8636_show_dom(const __u8 *id, __u32
eeprom_len)
* current fields are supported or not. A valid temperature
* reading is used as existence for TX/RX power.
*/
- if ((sd.sfp_temp[MCURR] == 0x0) || (sd.sfp_temp[MCURR] == 0xFFFF))
+ if ((sd.sfp_temp[MCURR] == 0x0) ||
+ (sd.sfp_temp[MCURR] == (__s16)0xFFFF))
return;
printf("\t%-41s : %s\n", "Alarm/warning flags implemented",
--
2.21.0
