Prevent a division by 0 when monitoring is not enabled.
Fixes: 1d8613a23f3c ("scsi: ufs: core: Introduce HBA performance monitor sysfs nodes")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Gwendal Grignou <gwendal@xxxxxxxxxxxx>
---
drivers/ufs/core/ufs-sysfs.c | 6 ++++++
1 file changed, 6 insertions(+)
diff --git a/drivers/ufs/core/ufs-sysfs.c b/drivers/ufs/core/ufs-sysfs.c
index c95906443d5f9..3692b39b35e78 100644
--- a/drivers/ufs/core/ufs-sysfs.c
+++ b/drivers/ufs/core/ufs-sysfs.c
@@ -485,6 +485,9 @@ static ssize_t read_req_latency_avg_show(struct device *dev,
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_hba_monitor *m = &hba->monitor;
+ if (!m->nr_req[READ])
+ return sysfs_emit(buf, "0\n");
+
return sysfs_emit(buf, "%llu\n", div_u64(ktime_to_us(m->lat_sum[READ]),
m->nr_req[READ]));
}
@@ -552,6 +555,9 @@ static ssize_t write_req_latency_avg_show(struct device *dev,
struct ufs_hba *hba = dev_get_drvdata(dev);
struct ufs_hba_monitor *m = &hba->monitor;
+ if (!m->nr_req[WRITE])
+ return sysfs_emit(buf, "0\n");
+
return sysfs_emit(buf, "%llu\n", div_u64(ktime_to_us(m->lat_sum[WRITE]),
m->nr_req[WRITE]));
}
--
2.47.0.338.g60cca15819-goog
