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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>
This commit is contained in:
Arnd Bergmann 2016-06-17 21:56:15 +02:00 committed by Greg Kroah-Hartman
parent 533364c7c6
commit 70db384cd6
1 changed files with 5 additions and 4 deletions
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9
drivers/staging/comedi/comedi_fops.c
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@ -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;