net: phy: sfp: Handle unimplemented hwmon limits and alarms

Not all SFPs implement the registers containing sensor limits and
alarms. Luckily, there is a bit indicating if they are implemented or
not. Add checking for this bit, when deciding if the hwmon attributes
should be visible.

Fixes: 1323061a018a ("net: phy: sfp: Add HWMON support for module sensors")
Signed-off-by: Andrew Lunn <andrew@lunn.ch>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/net/phy/sfp.c b/drivers/net/phy/sfp.c
index 4637d98..52fffb9 100644 (file)
--- a/drivers/net/phy/sfp.c
+++ b/drivers/net/phy/sfp.c
@@ -398,7 +398,6 @@ static umode_t sfp_hwmon_is_visible(const void *data,
        switch (type) {
        case hwmon_temp:
                switch (attr) {
-               case hwmon_temp_input:
                case hwmon_temp_min_alarm:
                case hwmon_temp_max_alarm:
                case hwmon_temp_lcrit_alarm:
@@ -407,13 +406,16 @@ static umode_t sfp_hwmon_is_visible(const void *data,
                case hwmon_temp_max:
                case hwmon_temp_lcrit:
                case hwmon_temp_crit:
+                       if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+                               return 0;
+                       /* fall through */
+               case hwmon_temp_input:
                        return 0444;
                default:
                        return 0;
                }
        case hwmon_in:
                switch (attr) {
-               case hwmon_in_input:
                case hwmon_in_min_alarm:
                case hwmon_in_max_alarm:
                case hwmon_in_lcrit_alarm:
@@ -422,13 +424,16 @@ static umode_t sfp_hwmon_is_visible(const void *data,
                case hwmon_in_max:
                case hwmon_in_lcrit:
                case hwmon_in_crit:
+                       if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+                               return 0;
+                       /* fall through */
+               case hwmon_in_input:
                        return 0444;
                default:
                        return 0;
                }
        case hwmon_curr:
                switch (attr) {
-               case hwmon_curr_input:
                case hwmon_curr_min_alarm:
                case hwmon_curr_max_alarm:
                case hwmon_curr_lcrit_alarm:
@@ -437,6 +442,10 @@ static umode_t sfp_hwmon_is_visible(const void *data,
                case hwmon_curr_max:
                case hwmon_curr_lcrit:
                case hwmon_curr_crit:
+                       if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+                               return 0;
+                       /* fall through */
+               case hwmon_curr_input:
                        return 0444;
                default:
                        return 0;
@@ -452,7 +461,6 @@ static umode_t sfp_hwmon_is_visible(const void *data,
                    channel == 1)
                        return 0;
                switch (attr) {
-               case hwmon_power_input:
                case hwmon_power_min_alarm:
                case hwmon_power_max_alarm:
                case hwmon_power_lcrit_alarm:
@@ -461,6 +469,10 @@ static umode_t sfp_hwmon_is_visible(const void *data,
                case hwmon_power_max:
                case hwmon_power_lcrit:
                case hwmon_power_crit:
+                       if (!(sfp->id.ext.enhopts & SFP_ENHOPTS_ALARMWARN))
+                               return 0;
+                       /* fall through */
+               case hwmon_power_input:
                        return 0444;
                default:
                        return 0;