Merge tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-mediagrafted

Pull media updates from Mauro Carvalho Chehab:

 - v4l2-core: added ISP statistics support and per-block validation

 - v4l2-core: Allow unknown HDR10 white point and luminance

 - New camera sensors: Sony IMX678 and IMX471m, Himax HM1092 IR sensor

 - New codec: Milos: VPU v2.0 codec support

 - isp driver: gained support for Dreamchip RPPX1 ISP framework

 - vsp1 driver: gained support for RZ/T2H and RZ/N2H

 - Novalake driver: gained CVS support for new NVL hardware

 - dvb-core: fix feed leak on failed DMX_ADD_PID

 - several driver fixes, cleanups and minor improvements

* tag 'media/v7.3-1' of git://git.kernel.org/pub/scm/linux/kernel/git/mchehab/linux-media: (308 commits)
  media: ipu-bridge: check all DMI entries when overriding sensor rotation
  media: v4l2-async: avoid deleting unlinked ASC entry on link error
  media: rzg2l-cru: Align bytesperline to hardware DMA stride requirement
  media: intel/ipu6: fix async notifier cleanup leak on parse error
  media: staging/ipu7: fix async notifier UAF on probe error path
  media: amd: isp4: fix self-deadlock in isp4sd_pwron_and_init() error path
  media: amd: isp4: release partial allocations in isp4if_alloc_fw_gpumem()
  media: rcar-isp: Fix VSPX reference leaks
  media: rcar-isp: Release ISPCORE resources
  media: i2c: imx415: Release runtime PM reference on VBLANK error
  media: i2c: imx415: Return test pattern write errors
  media: renesas: vsp1: Declare index variables in for loop statement
  media: renesas: vsp1: Make reset control optional to support platforms without a reset line
  media: dt-bindings: media: renesas,vsp1: Document RZ/T2H and RZ/N2H SoCs
  media: dt-bindings: media: renesas,fcp: Document RZ/T2H and RZ/N2H SoCs
  media: nxp: imx8-isi: Add additional 32-bit RGB format support
  media: nxp: imx8-isi: Add 16-bit raw Bayer format support
  media: nxp: imx8-isi: Implement per-stream reference counting for multiplexed streams
  media: nxp: imx8-isi: Use BIT_ULL() for 64-bit stream masks
  media: nxp: imx8-isi: Correct color map between V4L2 and ISI
  ...

1 files changed, 138 insertions, 0 deletions

diff --git a/drivers/md/dm-path-selector.c b/drivers/md/dm-path-selector.c
new file mode 100644
index 000000000..006a7991f
--- /dev/null
+++ b/drivers/md/dm-path-selector.c
@@ -0,0 +1,138 @@
+// SPDX-License-Identifier: GPL-2.0-only
+/*
+ * Copyright (C) 2003 Sistina Software.
+ * Copyright (C) 2004 Red Hat, Inc. All rights reserved.
+ *
+ * Module Author: Heinz Mauelshagen
+ *
+ * This file is released under the GPL.
+ *
+ * Path selector registration.
+ */
+
+#include <linux/device-mapper.h>
+#include <linux/module.h>
+
+#include "dm-path-selector.h"
+
+#include <linux/slab.h>
+
+struct ps_internal {
+	struct path_selector_type pst;
+	struct list_head list;
+};
+
+#define pst_to_psi(__pst) container_of((__pst), struct ps_internal, pst)
+
+static LIST_HEAD(_path_selectors);
+static DECLARE_RWSEM(_ps_lock);
+
+static struct ps_internal *__find_path_selector_type(const char *name)
+{
+	struct ps_internal *psi;
+
+	list_for_each_entry(psi, &_path_selectors, list) {
+		if (!strcmp(name, psi->pst.name))
+			return psi;
+	}
+
+	return NULL;
+}
+
+static struct ps_internal *get_path_selector(const char *name)
+{
+	struct ps_internal *psi;
+
+	down_read(&_ps_lock);
+	psi = __find_path_selector_type(name);
+	if (psi && !try_module_get(psi->pst.module))
+		psi = NULL;
+	up_read(&_ps_lock);
+
+	return psi;
+}
+
+struct path_selector_type *dm_get_path_selector(const char *name)
+{
+	struct ps_internal *psi;
+
+	if (!name)
+		return NULL;
+
+	psi = get_path_selector(name);
+	if (!psi) {
+		request_module("dm-%s", name);
+		psi = get_path_selector(name);
+	}
+
+	return psi ? &psi->pst : NULL;
+}
+
+void dm_put_path_selector(struct path_selector_type *pst)
+{
+	struct ps_internal *psi;
+
+	if (!pst)
+		return;
+
+	down_read(&_ps_lock);
+	psi = __find_path_selector_type(pst->name);
+	if (!psi)
+		goto out;
+
+	module_put(psi->pst.module);
+out:
+	up_read(&_ps_lock);
+}
+
+static struct ps_internal *_alloc_path_selector(struct path_selector_type *pst)
+{
+	struct ps_internal *psi = kzalloc_obj(*psi);
+
+	if (psi)
+		psi->pst = *pst;
+
+	return psi;
+}
+
+int dm_register_path_selector(struct path_selector_type *pst)
+{
+	int r = 0;
+	struct ps_internal *psi = _alloc_path_selector(pst);
+
+	if (!psi)
+		return -ENOMEM;
+
+	down_write(&_ps_lock);
+
+	if (__find_path_selector_type(pst->name)) {
+		kfree(psi);
+		r = -EBUSY;
+	} else
+		list_add(&psi->list, &_path_selectors);
+
+	up_write(&_ps_lock);
+
+	return r;
+}
+EXPORT_SYMBOL_GPL(dm_register_path_selector);
+
+void dm_unregister_path_selector(struct path_selector_type *pst)
+{
+	struct ps_internal *psi;
+
+	down_write(&_ps_lock);
+
+	psi = __find_path_selector_type(pst->name);
+	if (WARN_ON(!psi)) {
+		up_write(&_ps_lock);
+		return;
+	}
+
+	list_del(&psi->list);
+
+	up_write(&_ps_lock);
+
+	kfree(psi);
+}
+EXPORT_SYMBOL_GPL(dm_unregister_path_selector);