staging: comedi: avoid using timeval

Comedi uses 32-bit seconds for its timestamps, on both 32-bit and
64-bit machines. For all I can tell, this was originally meant as
a 'timespec', which would overflow in 2038 because of the use of
a signed 'long' on 32-bit machines, but it is now used as an
array of two unsigned 'lsampl_t' values in comedilib, which will
only overflow in 2106, on both 32-bit and 64-bit machines.

In an effort to get rid of all uses of 'struct timeval' in the kernel,
this replaces the internal code with a call to ktime_get_real_ts64()
and a comment at the location of the conversion.

Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/staging/comedi/comedi_fops.c b/drivers/staging/comedi/comedi_fops.c
index 4d87596..1999eed 100644 (file)
--- 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);
-                               data[0] = tv.tv_sec;
-                               data[1] = tv.tv_usec;
+                               ktime_get_real_ts64(&tv);
+                               /* unsigned data safe until 2106 */
+                               data[0] = (unsigned int)tv.tv_sec;
+                               data[1] = tv.tv_nsec / NSEC_PER_USEC;
                                ret = 2;
 
                                break;