scsi: pmcraid: replace struct timeval with ktime_get_real_seconds()

Replace the use of struct timeval and do_gettimeofday() with
64 bit ktime_get_real_seconds. Prevents 32-bit type overflow
in year 2038 on 32-bit systems.

Driver was using the seconds portion of struct timeval (.tv_secs)
to pass a millseconds timestamp to the firmware. This change maintains
that same behavior using ktime_get_real_seconds.

The structure used to pass the timestamp to firmware is 48 bits and
works fine as long as the top 16 bits are zero and they will be zero
for a long time..ie. thousands of years.

Alternative Change:  Add sub second granularity to timestamp

As noted above, the driver only used the seconds portion of timeval,
ignores the microseconds portion, and by multiplying by 1000 effectively
does a <<10 and always writes zero into timestamp[0].

The alternative change would pass all the bits to the firmware:

        struct timespec64 ts;

        ktime_get_real_ts64(&ts);
        timestamp = ts.tv_sec * MSEC_PER_SEC + ts.tv_nsec / NSEC_PER_MSEC;

Signed-off-by: Alison Schofield <amsfield22@gmail.com>
Reviewed-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>

1 files changed, 2 insertions, 3 deletions

diff --git a/drivers/scsi/pmcraid.c b/drivers/scsi/pmcraid.c
index ed31d8cc6266..3f64275cfafd 100644
--- a/drivers/scsi/pmcraid.c
+++ b/drivers/scsi/pmcraid.c
@@ -45,6 +45,7 @@
 #include <asm/processor.h>
 #include <linux/libata.h>
 #include <linux/mutex.h>
+#include <linux/ktime.h>
 #include <scsi/scsi.h>
 #include <scsi/scsi_host.h>
 #include <scsi/scsi_device.h>
@@ -5563,11 +5564,9 @@ static void pmcraid_set_timestamp(struct pmcraid_cmd *cmd)
         __be32 time_stamp_len = cpu_to_be32(PMCRAID_TIMESTAMP_LEN);
         struct pmcraid_ioadl_desc *ioadl = ioarcb->add_data.u.ioadl;
 
-        struct timeval tv;
         __le64 timestamp;
 
-        do_gettimeofday(&tv);
-        timestamp = tv.tv_sec * 1000;
+        timestamp = ktime_get_real_seconds() * 1000;
 
         pinstance->timestamp_data->timestamp[0] = (__u8)(timestamp);
         pinstance->timestamp_data->timestamp[1] = (__u8)((timestamp) >> 8);