ptp: increase maximum adjustment of virtual clocks.

Increase the maximum frequency offset of virtual clocks to 50% to enable
faster slewing corrections.

This value cannot be represented as scaled ppm when long has 32 bits,
but that is already the case for other drivers, even those that provide
the adjfine() function, i.e. 32-bit applications are expected to check
for the limit.

Signed-off-by: Miroslav Lichvar <mlichvar@redhat.com>
Acked-by: Richard Cochran <richardcochran@gmail.com>
Cc: Yangbo Lu <yangbo.lu@nxp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>

diff --git a/drivers/ptp/ptp_vclock.c b/drivers/ptp/ptp_vclock.c
index ab1d233173e139ca715596535ea3e7bc4b7dc710..5aa2b32d9dc75816ee5f8a7ab2b4ca372e7adcc6 100644 (file)
--- a/drivers/ptp/ptp_vclock.c
+++ b/drivers/ptp/ptp_vclock.c
@@ -84,8 +84,7 @@ static long ptp_vclock_refresh(struct ptp_clock_info *ptp)
 static const struct ptp_clock_info ptp_vclock_info = {
        .owner          = THIS_MODULE,
        .name           = "ptp virtual clock",
-       /* The maximum ppb value that long scaled_ppm can support */
-       .max_adj        = 32767999,
+       .max_adj        = 500000000,
        .adjfine        = ptp_vclock_adjfine,
        .adjtime        = ptp_vclock_adjtime,
        .gettime64      = ptp_vclock_gettime,