Merge tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-tracegrafted

Pull tracing fixes from Steven Rostedt:

 - Fix error output of boot instance creation failure

   Currently if a boot instance creation fails, instead of printing out
   the name of the instance that failed, it prints "(null)". That is
   because it prints "cur_str" that had already been processed by
   strsep(). Print the saved name instead.

   While at it, print the error code of the failure.

 - Fix use-after-free for same named historgrams

   Histograms can be named so that they can be used in multiple events.
   But if the named histogram has a variable attached, the second event
   that uses the named histogram which duplicates it and needs to free
   the original after duplication leaves the old variable in place and
   still visible. If another histogram uses than variable, it will use
   the stale one which will try to reference the freed duplicate
   histogram and crash the kernel.

   Free the duplicate variables along with the duplicated histogram
   data.

 - Check return value of kthread_run() in event self test

   The events self tests uses a kthread for testing but does not check
   if it succeeded in creating a kthread. If the kthread creation were
   to fail, the code will still try to call kthread_stop() on the error
   returned.

 - Fix race between reading trace_pipe and updating subbuffer size

   If a user is reading the trace_pipe file at the same time they update
   the ring buffer sub-buffer size, can cause the trace_pipe read to
   read stale data. Add trace_access_lock() around updating the ring
   buffer sub-buffer size.

 - Fix eventfs_inode on failure path in creation of the events directory

   In the creation of the "events" directory, if after allocating the
   eventfs_inode a failure is detected, it calls cleanup_ei() which
   calls free_ei(). The free_ei() will test if eventfs_inode being freed
   has no children. It is a bug if it does. But on the failure case of
   the creation of the "events" directory, the children lists have not
   yet been initialized and the free will trigger a warning because
   list_empty() on an uninitialized list returns false.

   Move the initialization into init_ei() where it makes more sense and
   makes sure that a created eventfs_inode has its lists initialized
   upon creation.

 - Check return value of kthread_run() in ftrace direct sample code

   The sample code that shows how to use the ftrace direct calls does
   not test the return of kthread_run() to see if it succeeds. Return a
   failure if the kthread_run() doesn't succeed.

 - Clear user events state on fork in case of alloc failure

   On fork, the child gets a pointer to the parent's user events state.
   It makes a copy of it then updates the child's pointer to it. But if
   the allocation fails, the duplication function leaves the child with
   a pointer to its parent's descriptor. When the child cleans up its
   data, it will free the parent's descriptor while the parent is still
   using it.

   In the duplication function, set the child's user_event_mm to NULL
   before testing if the allocation succeeded, and when it exits it will
   not free the parent's descriptor.

 - Fix retry exhaustion in simple ring buffer reader swap

   simple_ring_buffer_swap_reader_page() starts with retry set to 8 and
   post-decrements it only after a failed link replacement. On the final
   attempt, a successful replacement leaves retry at zero, while a
   failed replacement leaves it at -1.

   But the check for success expects the retry value to be non-zero and
   exits with an error on zero. This is the opposite result. Fix it.

 - Fail nicely when the remote swap_reader_page() returns an error

   Currently, if the swap_reader_page() of a remote buffer fails, it
   triggers a WARN_ON_ONCE() and continues normally. Instead, have it
   exit with an error and a pr_warn() print instead of a full WARNING.

* tag 'trace-v7.3-2' of git://git.kernel.org/pub/scm/linux/kernel/git/trace/linux-trace:
  ring-buffer: Stop remote reader update when page swap fails
  tracing: Fix retry exhaustion in simple ring buffer reader swap
  tracing/user_events: Clear copied tracing state before fork duplication
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-multi-modify
  samples/ftrace: Fix kthread_stop() on ERR_PTR in ftrace-direct-modify
  eventfs: Initialize ei->children and ei->list in init_ei()
  tracing: Fix use-after-free in trace_pipe read on sub-buffer order change
  tracing: Fix crash passing ERR_PTR to kthread_stop()
  tracing: Fix use-after-free with same-name named triggers
  tracing: Fix logged instance name on creation failure

1 files changed, 252 insertions, 0 deletions

diff --git a/drivers/hid/wacom.h b/drivers/hid/wacom.h
new file mode 100644
index 000000000..1deacb456
--- /dev/null
+++ b/drivers/hid/wacom.h
@@ -0,0 +1,252 @@
+/* SPDX-License-Identifier: GPL-2.0-or-later */
+/*
+ *  USB Wacom tablet support
+ *
+ *  Copyright (c) 2000-2004 Vojtech Pavlik	<vojtech@ucw.cz>
+ *  Copyright (c) 2000 Andreas Bach Aaen	<abach@stofanet.dk>
+ *  Copyright (c) 2000 Clifford Wolf		<clifford@clifford.at>
+ *  Copyright (c) 2000 Sam Mosel		<sam.mosel@computer.org>
+ *  Copyright (c) 2000 James E. Blair		<corvus@gnu.org>
+ *  Copyright (c) 2000 Daniel Egger		<egger@suse.de>
+ *  Copyright (c) 2001 Frederic Lepied		<flepied@mandrakesoft.com>
+ *  Copyright (c) 2004 Panagiotis Issaris	<panagiotis.issaris@mech.kuleuven.ac.be>
+ *  Copyright (c) 2002-2011 Ping Cheng		<pingc@wacom.com>
+ *  Copyright (c) 2014 Benjamin Tissoires	<benjamin.tissoires@redhat.com>
+ *
+ *  ChangeLog:
+ *      v0.1 (vp)  - Initial release
+ *      v0.2 (aba) - Support for all buttons / combinations
+ *      v0.3 (vp)  - Support for Intuos added
+ *	v0.4 (sm)  - Support for more Intuos models, menustrip
+ *			relative mode, proximity.
+ *	v0.5 (vp)  - Big cleanup, nifty features removed,
+ *			they belong in userspace
+ *	v1.8 (vp)  - Submit URB only when operating, moved to CVS,
+ *			use input_report_key instead of report_btn and
+ *			other cleanups
+ *	v1.11 (vp) - Add URB ->dev setting for new kernels
+ *	v1.11 (jb) - Add support for the 4D Mouse & Lens
+ *	v1.12 (de) - Add support for two more inking pen IDs
+ *	v1.14 (vp) - Use new USB device id probing scheme.
+ *		     Fix Wacom Graphire mouse wheel
+ *	v1.18 (vp) - Fix mouse wheel direction
+ *		     Make mouse relative
+ *      v1.20 (fl) - Report tool id for Intuos devices
+ *                 - Multi tools support
+ *                 - Corrected Intuos protocol decoding (airbrush, 4D mouse, lens cursor...)
+ *                 - Add PL models support
+ *		   - Fix Wacom Graphire mouse wheel again
+ *	v1.21 (vp) - Removed protocol descriptions
+ *		   - Added MISC_SERIAL for tool serial numbers
+ *	      (gb) - Identify version on module load.
+ *    v1.21.1 (fl) - added Graphire2 support
+ *    v1.21.2 (fl) - added Intuos2 support
+ *                 - added all the PL ids
+ *    v1.21.3 (fl) - added another eraser id from Neil Okamoto
+ *                 - added smooth filter for Graphire from Peri Hankey
+ *                 - added PenPartner support from Olaf van Es
+ *                 - new tool ids from Ole Martin Bjoerndalen
+ *	v1.29 (pc) - Add support for more tablets
+ *		   - Fix pressure reporting
+ *	v1.30 (vp) - Merge 2.4 and 2.5 drivers
+ *		   - Since 2.5 now has input_sync(), remove MSC_SERIAL abuse
+ *		   - Cleanups here and there
+ *    v1.30.1 (pi) - Added Graphire3 support
+ *	v1.40 (pc) - Add support for several new devices, fix eraser reporting, ...
+ *	v1.43 (pc) - Added support for Cintiq 21UX
+ *		   - Fixed a Graphire bug
+ *		   - Merged wacom_intuos3_irq into wacom_intuos_irq
+ *	v1.44 (pc) - Added support for Graphire4, Cintiq 710, Intuos3 6x11, etc.
+ *		   - Report Device IDs
+ *      v1.45 (pc) - Added support for DTF 521, Intuos3 12x12 and 12x19
+ *                 - Minor data report fix
+ *      v1.46 (pc) - Split wacom.c into wacom_sys.c and wacom_wac.c,
+ *		   - where wacom_sys.c deals with system specific code,
+ *		   - and wacom_wac.c deals with Wacom specific code
+ *		   - Support Intuos3 4x6
+ *      v1.47 (pc) - Added support for Bamboo
+ *      v1.48 (pc) - Added support for Bamboo1, BambooFun, and Cintiq 12WX
+ *      v1.49 (pc) - Added support for USB Tablet PC (0x90, 0x93, and 0x9A)
+ *      v1.50 (pc) - Fixed a TabletPC touch bug in 2.6.28
+ *      v1.51 (pc) - Added support for Intuos4
+ *      v1.52 (pc) - Query Wacom data upon system resume
+ *                 - add defines for features->type
+ *                 - add new devices (0x9F, 0xE2, and 0XE3)
+ *      v2.00 (bt) - conversion to a HID driver
+ *                 - integration of the Bluetooth devices
+ */
+
+#ifndef WACOM_H
+#define WACOM_H
+
+#include <linux/kernel.h>
+#include <linux/slab.h>
+#include <linux/module.h>
+#include <linux/mod_devicetable.h>
+#include <linux/hid.h>
+#include <linux/kfifo.h>
+#include <linux/leds.h>
+#include <linux/usb/input.h>
+#include <linux/power_supply.h>
+#include <linux/timer.h>
+#include <linux/unaligned.h>
+
+/*
+ * Version Information
+ */
+#define DRIVER_VERSION "v2.00"
+#define DRIVER_AUTHOR "Vojtech Pavlik <vojtech@ucw.cz>"
+#define DRIVER_DESC "USB Wacom tablet driver"
+
+#define USB_VENDOR_ID_WACOM	0x056a
+#define USB_VENDOR_ID_LENOVO	0x17ef
+
+enum wacom_worker {
+	WACOM_WORKER_WIRELESS,
+	WACOM_WORKER_BATTERY,
+	WACOM_WORKER_REMOTE,
+	WACOM_WORKER_MODE_CHANGE,
+};
+
+struct wacom;
+
+struct wacom_led {
+	struct led_classdev cdev;
+	struct led_trigger trigger;
+	struct wacom *wacom;
+	unsigned int group;
+	unsigned int id;
+	u8 llv;
+	u8 hlv;
+	bool held;
+};
+
+struct wacom_group_leds {
+	u8 select; /* status led selector (0..3) */
+	struct wacom_led *leds;
+	unsigned int count;
+	struct device *dev;
+};
+
+struct wacom_battery {
+	struct wacom *wacom;
+	struct power_supply_desc bat_desc;
+	struct power_supply *battery;
+	char bat_name[WACOM_NAME_MAX];
+	int bat_status;
+	int battery_capacity;
+	int bat_charging;
+	int bat_connected;
+	int ps_connected;
+};
+
+struct wacom_remote {
+	spinlock_t remote_lock;
+	struct kfifo remote_fifo;
+	struct kobject *remote_dir;
+	struct {
+		struct attribute_group group;
+		u32 serial;
+		struct input_dev *input;
+		bool registered;
+		struct wacom_battery battery;
+		ktime_t active_time;
+	} remotes[WACOM_MAX_REMOTES];
+};
+
+struct wacom {
+	struct usb_device *usbdev;
+	struct usb_interface *intf;
+	struct wacom_wac wacom_wac;
+	struct hid_device *hdev;
+	struct mutex lock;
+	struct work_struct wireless_work;
+	struct work_struct battery_work;
+	struct work_struct remote_work;
+	struct delayed_work init_work;
+	struct delayed_work aes_battery_work;
+	struct wacom_remote *remote;
+	struct work_struct mode_change_work;
+	struct timer_list idleprox_timer;
+	bool generic_has_leds;
+	struct wacom_leds {
+		struct wacom_group_leds *groups;
+		unsigned int count;
+		u8 llv;       /* status led brightness no button (1..127) */
+		u8 hlv;       /* status led brightness button pressed (1..127) */
+		u8 img_lum;   /* OLED matrix display brightness */
+		u8 max_llv;   /* maximum brightness of LED (llv) */
+		u8 max_hlv;   /* maximum brightness of LED (hlv) */
+	} led;
+	struct wacom_battery battery;
+	bool resources;
+};
+
+static inline void wacom_schedule_work(struct wacom_wac *wacom_wac,
+				       enum wacom_worker which)
+{
+	struct wacom *wacom = container_of(wacom_wac, struct wacom, wacom_wac);
+
+	switch (which) {
+	case WACOM_WORKER_WIRELESS:
+		schedule_work(&wacom->wireless_work);
+		break;
+	case WACOM_WORKER_BATTERY:
+		schedule_work(&wacom->battery_work);
+		break;
+	case WACOM_WORKER_REMOTE:
+		schedule_work(&wacom->remote_work);
+		break;
+	case WACOM_WORKER_MODE_CHANGE:
+		schedule_work(&wacom->mode_change_work);
+		break;
+	}
+}
+
+/*
+ * Convert a signed 32-bit integer to an unsigned n-bit integer. Undoes
+ * the normally-helpful work of 'hid_snto32' for fields that use signed
+ * ranges for questionable reasons.
+ */
+static inline __u32 wacom_s32tou(s32 value, __u8 n)
+{
+	switch (n) {
+	case 8:  return ((__u8)value);
+	case 16: return ((__u16)value);
+	case 32: return ((__u32)value);
+	}
+	return value & (1 << (n - 1)) ? value & (~(~0U << n)) : value;
+}
+
+static inline u32 wacom_rescale(u32 value, u32 in_max, u32 out_max)
+{
+	if (in_max == 0 || out_max == 0)
+		return 0;
+	value = clamp(value, 0, in_max);
+	return DIV_ROUND_CLOSEST(value * out_max, in_max);
+}
+
+extern const struct hid_device_id wacom_ids[];
+
+void wacom_wac_irq(struct wacom_wac *wacom_wac, size_t len);
+void wacom_setup_device_quirks(struct wacom *wacom);
+int wacom_setup_pen_input_capabilities(struct input_dev *input_dev,
+				   struct wacom_wac *wacom_wac);
+int wacom_setup_touch_input_capabilities(struct input_dev *input_dev,
+				   struct wacom_wac *wacom_wac);
+int wacom_setup_pad_input_capabilities(struct input_dev *input_dev,
+				       struct wacom_wac *wacom_wac);
+void wacom_wac_usage_mapping(struct hid_device *hdev,
+		struct hid_field *field, struct hid_usage *usage);
+void wacom_wac_event(struct hid_device *hdev, struct hid_field *field,
+		struct hid_usage *usage, __s32 value);
+void wacom_wac_report(struct hid_device *hdev, struct hid_report *report);
+void wacom_battery_work(struct work_struct *work);
+enum led_brightness wacom_leds_brightness_get(struct wacom_led *led);
+struct wacom_led *wacom_led_find(struct wacom *wacom, unsigned int group,
+				 unsigned int id);
+struct wacom_led *wacom_led_next(struct wacom *wacom, struct wacom_led *cur);
+int wacom_equivalent_usage(int usage);
+int wacom_initialize_leds(struct wacom *wacom);
+void wacom_idleprox_timeout(struct timer_list *list);
+#endif