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authorGeorge Spelvin <linux@horizon.com>2013-02-10 04:43:41 -0500
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2013-02-13 09:43:07 -0800
commitce3da1a654c83c6c9cb0b33477815e5d1293cc00 (patch)
treec4d24d98eceadc88d209e47d7957ef3415a456d3
parentd953e0e837e65ecc1ddaa4f9560f7925878a0de6 (diff)
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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 <peter@hurleysoftware.com> Signed-off-by: George Spelvin <linux@horizon.com> Acked-by: Rodolfo Giometti <giometti@enneenne.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
-rw-r--r--drivers/pps/clients/pps-ldisc.c11
1 files changed, 10 insertions, 1 deletions
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 <linux/serial_core.h>
#include <linux/tty.h>
#include <linux/pps_kernel.h>
+#include <linux/bug.h>
#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);
}