Merge tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc updates from Greg KH:
 "Here is the big set of char/misc driver patches for 4.17-rc1.

  There are a lot of little things in here, nothing huge, but all
  important to the different hardware types involved:

   -  thunderbolt driver updates

   -  parport updates (people still care...)

   -  nvmem driver updates

   -  mei updates (as always)

   -  hwtracing driver updates

   -  hyperv driver updates

   -  extcon driver updates

   -  ... and a handful of even smaller driver subsystem and individual
      driver updates

  All of these have been in linux-next with no reported issues"

* tag 'char-misc-4.17-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (149 commits)
  hwtracing: Add HW tracing support menu
  intel_th: Add ACPI glue layer
  intel_th: Allow forcing host mode through drvdata
  intel_th: Pick up irq number from resources
  intel_th: Don't touch switch routing in host mode
  intel_th: Use correct method of finding hub
  intel_th: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate
  stm class: Make dummy's master/channel ranges configurable
  stm class: Add SPDX GPL-2.0 header to replace GPLv2 boilerplate
  MAINTAINERS: Bestow upon myself the care for drivers/hwtracing
  hv: add SPDX license id to Kconfig
  hv: add SPDX license to trace
  Drivers: hv: vmbus: do not mark HV_PCIE as perf_device
  Drivers: hv: vmbus: respect what we get from hv_get_synint_state()
  /dev/mem: Avoid overwriting "err" in read_mem()
  eeprom: at24: use SPDX identifier instead of GPL boiler-plate
  eeprom: at24: simplify the i2c functionality checking
  eeprom: at24: fix a line break
  eeprom: at24: tweak newlines
  eeprom: at24: refactor at24_probe()
  ...

1 files changed, 18 insertions, 13 deletions

diff --git a/drivers/hwtracing/intel_th/core.c b/drivers/hwtracing/intel_th/core.c
index 1a023e30488c..da962aa2cef5 100644
--- a/drivers/hwtracing/intel_th/core.c
+++ b/drivers/hwtracing/intel_th/core.c
@@ -1,16 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0
 /*
  * Intel(R) Trace Hub driver core
  *
  * Copyright (C) 2014-2015 Intel Corporation.
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License for
- * more details.
  */
 
 #define pr_fmt(fmt)	KBUILD_MODNAME ": " fmt
@@ -638,7 +630,8 @@ intel_th_subdevice_alloc(struct intel_th *th,
 		thdev->output.port = -1;
 		thdev->output.scratchpad = subdev->scrpd;
 	} else if (subdev->type == INTEL_TH_SWITCH) {
-		thdev->host_mode = host_mode;
+		thdev->host_mode =
+			INTEL_TH_CAP(th, host_mode_only) ? true : host_mode;
 		th->hub = thdev;
 	}
 
@@ -737,7 +730,8 @@ static int intel_th_populate(struct intel_th *th)
 		struct intel_th_device *thdev;
 
 		/* only allow SOURCE and SWITCH devices in host mode */
-		if (host_mode && subdev->type == INTEL_TH_OUTPUT)
+		if ((INTEL_TH_CAP(th, host_mode_only) || host_mode) &&
+		    subdev->type == INTEL_TH_OUTPUT)
 			continue;
 
 		/*
@@ -813,7 +807,14 @@ intel_th_alloc(struct device *dev, struct intel_th_drvdata *drvdata,
 	       struct resource *devres, unsigned int ndevres, int irq)
 {
 	struct intel_th *th;
-	int err;
+	int err, r;
+
+	if (irq == -1)
+		for (r = 0; r < ndevres; r++)
+			if (devres[r].flags & IORESOURCE_IRQ) {
+				irq = devres[r].start;
+				break;
+			}
 
 	th = kzalloc(sizeof(*th), GFP_KERNEL);
 	if (!th)
@@ -935,9 +936,13 @@ EXPORT_SYMBOL_GPL(intel_th_trace_disable);
 int intel_th_set_output(struct intel_th_device *thdev,
 			unsigned int master)
 {
-	struct intel_th_device *hub = to_intel_th_device(thdev->dev.parent);
+	struct intel_th_device *hub = to_intel_th_hub(thdev);
 	struct intel_th_driver *hubdrv = to_intel_th_driver(hub->dev.driver);
 
+	/* In host mode, this is up to the external debugger, do nothing. */
+	if (hub->host_mode)
+		return 0;
+
 	if (!hubdrv->set_output)
 		return -ENOTSUPP;