[PATCH] staging: comedi: avoid using timeval

[Arnd Bergmann]

It depends on user space whether this is safe or not: if programs
interpret the data as a signed time_t value, they will be broken
in y2038, and we have to redesign the entire interface.

Signed-off-by: Arnd Bergmann <arnd@xxxxxxxx>
---
 drivers/staging/comedi/comedi_fops.c | 7 ++++---
 1 file changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 629080f39db0..fe50d1f823c6 100644
--- a/drivers/staging/comedi/comedi_fops.c
+++ b/drivers/staging/comedi/comedi_fops.c
@@ -1256,16 +1256,17 @@ static int parse_insn(struct comedi_device *dev, struct comedi_insn *insn,
 		switch (insn->insn) {
 		case INSN_GTOD:
 			{
-				struct timeval tv;
+				struct timespec64 tv;
 
 				if (insn->n != 2) {
 					ret = -EINVAL;
 					break;
 				}
 
-				do_gettimeofday(&tv);
+				ktime_get_real_ts64(&tv);
 				data[0] = tv.tv_sec;
-				data[1] = tv.tv_usec;
+				/* unsigned data safe until 2106 */
+				data[1] = tv.tv_nsec / NSEC_PER_USEC;
 				ret = 2;
 
 				break;
-- 
2.9.0