Update to FreeBSD head 2018-11-15

Git mirror commit a18b0830c4be01b39489a891b63d6023ada6358a.

Update #3472.

3 files changed, 68 insertions, 1 deletions

diff --git a/freebsd/sys/dev/evdev/cdev.c b/freebsd/sys/dev/evdev/cdev.c
index 5ae14fed..a9370e7e 100644
--- a/freebsd/sys/dev/evdev/cdev.c
+++ b/freebsd/sys/dev/evdev/cdev.c
@@ -351,6 +351,19 @@ evdev_ioctl(struct cdev *dev, u_long cmd, caddr_t data, int fflag,
 	if (client->ec_revoked || evdev == NULL)
 		return (ENODEV);
 
+	/*
+	 * Fix evdev state corrupted with discarding of kdb events.
+	 * EVIOCGKEY and EVIOCGLED ioctls can suffer from this.
+	 */
+	if (evdev->ev_kdb_active) {
+		EVDEV_LOCK(evdev);
+		if (evdev->ev_kdb_active) {
+			evdev->ev_kdb_active = false;
+			evdev_restore_after_kdb(evdev);
+		}
+		EVDEV_UNLOCK(evdev);
+	}
+
 	/* file I/O ioctl handling */
 	switch (cmd) {
 	case FIOSETOWN:
diff --git a/freebsd/sys/dev/evdev/evdev.c b/freebsd/sys/dev/evdev/evdev.c
index a355ec50..63e651a2 100644
--- a/freebsd/sys/dev/evdev/evdev.c
+++ b/freebsd/sys/dev/evdev/evdev.c
@@ -34,9 +34,11 @@
 #include <sys/param.h>
 #include <sys/bitstring.h>
 #include <sys/conf.h>
+#include <sys/kdb.h>
 #include <sys/kernel.h>
 #include <sys/malloc.h>
 #include <sys/module.h>
+#include <sys/proc.h>
 #include <sys/sysctl.h>
 #include <sys/systm.h>
 
@@ -769,6 +771,30 @@ evdev_send_event(struct evdev_dev *evdev, uint16_t type, uint16_t code,
 	}
 }
 
+void
+evdev_restore_after_kdb(struct evdev_dev *evdev)
+{
+	int code;
+
+	EVDEV_LOCK_ASSERT(evdev);
+
+	/* Report postponed leds */
+	for (code = 0; code < LED_CNT; code++)
+		if (bit_test(evdev->ev_kdb_led_states, code))
+			evdev_send_event(evdev, EV_LED, code,
+			    !bit_test(evdev->ev_led_states, code));
+	bit_nclear(evdev->ev_kdb_led_states, 0, LED_MAX);
+
+	/* Release stuck keys (CTRL + ALT + ESC) */
+	evdev_stop_repeat(evdev);
+	for (code = 0; code < KEY_CNT; code++) {
+		if (bit_test(evdev->ev_key_states, code)) {
+			evdev_send_event(evdev, EV_KEY, code, KEY_EVENT_UP);
+			evdev_send_event(evdev, EV_SYN, SYN_REPORT, 1);
+		}
+	}
+}
+
 int
 evdev_push_event(struct evdev_dev *evdev, uint16_t type, uint16_t code,
     int32_t value)
@@ -777,8 +803,26 @@ evdev_push_event(struct evdev_dev *evdev, uint16_t type, uint16_t code,
 	if (evdev_check_event(evdev, type, code, value) != 0)
 		return (EINVAL);
 
+	/*
+	 * Discard all but LEDs kdb events as unrelated to userspace.
+	 * Aggregate LED updates and postpone reporting until kdb deactivation.
+	 */
+	if (kdb_active || SCHEDULER_STOPPED()) {
+		evdev->ev_kdb_active = true;
+		if (type == EV_LED)
+			bit_set(evdev->ev_kdb_led_states,
+			    bit_test(evdev->ev_led_states, code) != value);
+		return (0);
+	}
+
 	EVDEV_ENTER(evdev);
 
+	/* Fix evdev state corrupted with discarding of kdb events */
+	if (evdev->ev_kdb_active) {
+		evdev->ev_kdb_active = false;
+		evdev_restore_after_kdb(evdev);
+	}
+
 	evdev_modify_event(evdev, type, code, &value);
 	if (type == EV_SYN && code == SYN_REPORT &&
 	     bit_test(evdev->ev_flags, EVDEV_FLAG_MT_AUTOREL))
diff --git a/freebsd/sys/dev/evdev/evdev_private.h b/freebsd/sys/dev/evdev/evdev_private.h
index 05206a9d..71bdecaa 100644
--- a/freebsd/sys/dev/evdev/evdev_private.h
+++ b/freebsd/sys/dev/evdev/evdev_private.h
@@ -117,6 +117,10 @@ struct evdev_dev
 	bitstr_t		bit_decl(ev_sw_states, SW_CNT);
 	bool			ev_report_opened;
 
+	/* KDB state: */
+	bool			ev_kdb_active;
+	bitstr_t		bit_decl(ev_kdb_led_states, LED_CNT);
+
 	/* Multitouch protocol type B state: */
 	struct evdev_mt *	ev_mt;
 
@@ -132,9 +136,14 @@ struct evdev_dev
 	LIST_HEAD(, evdev_client) ev_clients;
 };
 
+#define	SYSTEM_CONSOLE_LOCK	&Giant
+
 #define	EVDEV_LOCK(evdev)		mtx_lock((evdev)->ev_lock)
 #define	EVDEV_UNLOCK(evdev)		mtx_unlock((evdev)->ev_lock)
-#define	EVDEV_LOCK_ASSERT(evdev)	mtx_assert((evdev)->ev_lock, MA_OWNED)
+#define	EVDEV_LOCK_ASSERT(evdev)	do {				\
+	if ((evdev)->ev_lock != SYSTEM_CONSOLE_LOCK)			\
+		mtx_assert((evdev)->ev_lock, MA_OWNED);			\
+} while (0)
 #define	EVDEV_ENTER(evdev)	do {					\
 	if ((evdev)->ev_lock_type == EV_LOCK_INTERNAL)			\
 		EVDEV_LOCK(evdev);					\
@@ -185,6 +194,7 @@ int evdev_cdev_destroy(struct evdev_dev *);
 bool evdev_event_supported(struct evdev_dev *, uint16_t);
 void evdev_set_abs_bit(struct evdev_dev *, uint16_t);
 void evdev_set_absinfo(struct evdev_dev *, uint16_t, struct input_absinfo *);
+void evdev_restore_after_kdb(struct evdev_dev *);
 
 /* Client interface: */
 int evdev_register_client(struct evdev_dev *, struct evdev_client *);