hwmon: (occ) Fix poll rate limiting

The poll rate limiter time was initialized at zero. This breaks the comparison in time_after if jiffies is large. Switch to storing the next update time rather than the previous time, and initialize the time when the device is probed.

Fixes c10e753d43eb ("hwmon (occ): Add sensor types and versions")

Signed-off-by Eddie James <[email protected]>

---
 drivers/hwmon/occ/common.c | 5 +++--
 drivers/hwmon/occ/common.h | 2 +-
 2 files changed, 4 insertions(+), 3 deletions(-)

drivers/hwmon/occ/common.c +3 -2

index f1ac153d0b56..967532afb1c0 100644
@@ -217,9 +217,9 @@ int occ_update_response(struct occ *occ)
 		return rc;
 
 	/* limit the maximum rate of polling the OCC */
-	if (time_after(jiffies, occ->last_update + OCC_UPDATE_FREQUENCY)) {
+	if (time_after(jiffies, occ->next_update)) {
 		rc = occ_poll(occ);
-		occ->last_update = jiffies;
+		occ->next_update = jiffies + OCC_UPDATE_FREQUENCY;
 	} else {
 		rc = occ->last_error;
 	}

@@ -1165,6 +1165,7 @@ int occ_setup(struct occ *occ, const char *name)
 		return rc;
 	}
 
+	occ->next_update = jiffies + OCC_UPDATE_FREQUENCY;
 	occ_parse_poll_response(occ);
 
 	rc = occ_setup_sensor_attrs(occ);

drivers/hwmon/occ/common.h +1 -1

index 67e6968b8978..e6df719770e8 100644
@@ -99,7 +99,7 @@ struct occ {
 	u8 poll_cmd_data;		/* to perform OCC poll command */
 	int (*send_cmd)(struct occ *occ, u8 *cmd);
 
-	unsigned long last_update;
+	unsigned long next_update;
 	struct mutex lock;		/* lock OCC access */
 
 	struct device *hwmon;