[PATCH] ptp: fix PTP PPS source's lookup cookie set

[Dario Binacchi <dariobin@libero.it>]

The setting took place before the PTP PPS source was registered, so
ptp->pps_source was NULL.

Fixes: 8602e40fc813 ("ptp: Set lookup cookie when creating a PTP PPS source.")
Signed-off-by: Dario Binacchi <dariobin@libero.it>
---

 drivers/ptp/ptp_clock.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/ptp/ptp_clock.c b/drivers/ptp/ptp_clock.c
index a23a37a4d5dc..457129c07221 100644
--- a/drivers/ptp/ptp_clock.c
+++ b/drivers/ptp/ptp_clock.c
@@ -218,7 +218,6 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 			pr_err("failed to create ptp aux_worker %d\n", err);
 			goto kworker_err;
 		}
-		ptp->pps_source->lookup_cookie = ptp;
 	}
 
 	err = ptp_populate_pin_groups(ptp);
@@ -238,6 +237,8 @@ struct ptp_clock *ptp_clock_register(struct ptp_clock_info *info,
 			pr_err("failed to register pps source\n");
 			goto no_pps;
 		}
+
+		ptp->pps_source->lookup_cookie = ptp;
 	}
 
 	/* Initialize a new device of our class in our clock structure. */
-- 
2.17.1