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@xxxxxxxxxxxxxxxxxx>
Signed-off-by: George Spelvin <linux@xxxxxxxxxxx>
---
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 60cee9e..a94f73e 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);
}
--
1.8.1.3
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