Merge tag 'char-misc-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc

Pull char/misc driver updates from Greg KH:
 "Here's the big char/misc driver patches for 4.10-rc1. Lots of tiny
  changes over lots of "minor" driver subsystems, the largest being some
  new FPGA drivers. Other than that, a few other new drivers, but no new
  driver subsystems added for this kernel cycle, a nice change.

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

* tag 'char-misc-4.10-rc1' of git://git.kernel.org/pub/scm/linux/kernel/git/gregkh/char-misc: (107 commits)
  uio-hv-generic: store physical addresses instead of virtual
  Tools: hv: kvp: configurable external scripts path
  uio-hv-generic: new userspace i/o driver for VMBus
  vmbus: add support for dynamic device id's
  hv: change clockevents unbind tactics
  hv: acquire vmbus_connection.channel_mutex in vmbus_free_channels()
  hyperv: Fix spelling of HV_UNKOWN
  mei: bus: enable non-blocking RX
  mei: fix the back to back interrupt handling
  mei: synchronize irq before initiating a reset.
  VME: Remove shutdown entry from vme_driver
  auxdisplay: ht16k33: select framebuffer helper modules
  MAINTAINERS: add git url for fpga
  fpga: Clarify how write_init works streaming modes
  fpga zynq: Fix incorrect ISR state on bootup
  fpga zynq: Remove priv->dev
  fpga zynq: Add missing \n to messages
  fpga: Add COMPILE_TEST to all drivers
  uio: pruss: add clk_disable()
  char/pcmcia: add some error checking in scr24x_read()
  ...

1 files changed, 24 insertions, 2 deletions

diff --git a/drivers/hwtracing/intel_th/gth.c b/drivers/hwtracing/intel_th/gth.c
index 33e09369a491..dd32d0bad687 100644
--- a/drivers/hwtracing/intel_th/gth.c
+++ b/drivers/hwtracing/intel_th/gth.c
@@ -564,6 +564,9 @@ static int intel_th_gth_assign(struct intel_th_device *thdev,
 	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 	int i, id;
 
+	if (thdev->host_mode)
+		return -EBUSY;
+
 	if (othdev->type != INTEL_TH_OUTPUT)
 		return -EINVAL;
 
@@ -600,6 +603,9 @@ static void intel_th_gth_unassign(struct intel_th_device *thdev,
 	struct gth_device *gth = dev_get_drvdata(&thdev->dev);
 	int port = othdev->output.port;
 
+	if (thdev->host_mode)
+		return;
+
 	spin_lock(&gth->gth_lock);
 	othdev->output.port = -1;
 	othdev->output.active = false;
@@ -654,9 +660,24 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
 	gth->base = base;
 	spin_lock_init(&gth->gth_lock);
 
+	/*
+	 * Host mode can be signalled via SW means or via SCRPD_DEBUGGER_IN_USE
+	 * bit. Either way, don't reset HW in this case, and don't export any
+	 * capture configuration attributes. Also, refuse to assign output
+	 * drivers to ports, see intel_th_gth_assign().
+	 */
+	if (thdev->host_mode)
+		goto done;
+
 	ret = intel_th_gth_reset(gth);
-	if (ret)
-		return ret;
+	if (ret) {
+		if (ret != -EBUSY)
+			return ret;
+
+		thdev->host_mode = true;
+
+		goto done;
+	}
 
 	for (i = 0; i < TH_CONFIGURABLE_MASTERS + 1; i++)
 		gth->master[i] = -1;
@@ -677,6 +698,7 @@ static int intel_th_gth_probe(struct intel_th_device *thdev)
 		return -ENOMEM;
 	}
 
+done:
 	dev_set_drvdata(dev, gth);
 
 	return 0;