Commit 540eb1eef 'scsi: libfc: fix seconds_since_last_reset calculation'
removed the use of 'struct timespec' from fc_get_host_stats(). This broke the
output of 'fcoeadm -s' after kernel 4.8-rc1 as lport->boot_time - jiffies
could become negative as in this example:
$ cat /sys/class/fc_host/host8/statistics/seconds_since_last_reset
0x10624dd2f1977b4
Take this into account so
/sys/class/fc_host/hostX/statistics/seconds_since_last_reset is sane again.
Fixes: 540eb1eef ('scsi: libfc: fix seconds_since_last_reset calculation')
Signed-off-by: Johannes Thumshirn <jthumsh...@suse.de>
Tested-by: Holger Schranz <hol...@fam-schranz.de>
---
drivers/scsi/libfc/fc_lport.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/libfc/fc_lport.c b/drivers/scsi/libfc/fc_lport.c
index 04ce7cf..475c0a9 100644
--- a/drivers/scsi/libfc/fc_lport.c
+++ b/drivers/scsi/libfc/fc_lport.c
@@ -304,11 +304,15 @@ struct fc_host_statistics *fc_get_host_stats(struct
Scsi_Host *shost)
unsigned int cpu;
u64 fcp_in_bytes = 0;
u64 fcp_out_bytes = 0;
+ unsigned long boot_time = lport->boot_time;
fc_stats = &lport->host_stats;
memset(fc_stats, 0, sizeof(struct fc_host_statistics));
- fc_stats->seconds_since_last_reset = (lport->boot_time - jiffies) / HZ;
+ if (boot_time > jiffies)
+ fc_stats->seconds_since_last_reset = (boot_time - jiffies) / HZ;
+ else
+ fc_stats->seconds_since_last_reset = (jiffies - boot_time) / HZ;
for_each_possible_cpu(cpu) {
struct fc_stats *stats;
--
1.8.5.6
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