From ce3da1a654c83c6c9cb0b33477815e5d1293cc00 Mon Sep 17 00:00:00 2001 From: George Spelvin Date: Sun, 10 Feb 2013 04:43:41 -0500 Subject: [PATCH] pps: Don't crash the machine when exiting will do PPS is not really the must-have subsystem that warrants crashing the machine if the ldisc interface is broken. Signed-off-by: Peter Hurley Signed-off-by: George Spelvin Acked-by: Rodolfo Giometti Signed-off-by: Greg Kroah-Hartman --- drivers/pps/clients/pps-ldisc.c | 11 ++++++++++- 1 file changed, 10 insertions(+), 1 deletion(-) diff --git a/drivers/pps/clients/pps-ldisc.c b/drivers/pps/clients/pps-ldisc.c index 60cee9e0ecb3..a94f73e1480d 100644 --- a/drivers/pps/clients/pps-ldisc.c +++ b/drivers/pps/clients/pps-ldisc.c @@ -25,6 +25,7 @@ #include #include #include +#include #define PPS_TTY_MAGIC 0x0001 @@ -33,7 +34,12 @@ static void pps_tty_dcd_change(struct tty_struct *tty, unsigned int status, { struct pps_device *pps = pps_lookup_dev(tty); - BUG_ON(pps == NULL); + /* + * This should never fail, but the ldisc locking is very + * convoluted, so don't crash just in case. + */ + if (WARN_ON_ONCE(pps == NULL)) + return; /* Now do the PPS event report */ pps_event(pps, ts, status ? PPS_CAPTUREASSERT : @@ -93,6 +99,9 @@ static void pps_tty_close(struct tty_struct *tty) alias_n_tty_close(tty); + if (WARN_ON(!pps)) + return; + dev_info(pps->dev, "removed\n"); pps_unregister_source(pps); } -- 2.30.2