/*
 *  Generic Backlight Driver
 *
 *  Copyright (c) 2004-2008 Richard Purdie
 *
 *  This program is free software; you can redistribute it and/or modify
 *  it under the terms of the GNU General Public License version 2 as
 *  published by the Free Software Foundation.
 *
 */

#include <linux/module.h>
#include <linux/kernel.h>
#include <linux/init.h>
#include <linux/platform_device.h>
#include <linux/mutex.h>
#include <linux/fb.h>
#include <linux/backlight.h>

static int genericbl_intensity;
static struct backlight_device *generic_backlight_device;
static struct generic_bl_info *bl_machinfo;

/* Flag to signal when the battery is low */
#define GENERICBL_BATTLOW       BL_CORE_DRIVER1

static int genericbl_send_intensity(struct backlight_device *bd)
{
	int intensity = bd->props.brightness;

	if (bd->props.power != FB_BLANK_UNBLANK)
		intensity = 0;
	if (bd->props.state & BL_CORE_FBBLANK)
		intensity = 0;
	if (bd->props.state & BL_CORE_SUSPENDED)
		intensity = 0;
	if (bd->props.state & GENERICBL_BATTLOW)
		intensity &= bl_machinfo->limit_mask;

	bl_machinfo->set_bl_intensity(intensity);

	genericbl_intensity = intensity;

	if (bl_machinfo->kick_battery)
		bl_machinfo->kick_battery();

	return 0;
}

static int genericbl_get_intensity(struct backlight_device *bd)
{
	return genericbl_intensity;
}

static const struct backlight_ops genericbl_ops = {
	.options = BL_CORE_SUSPENDRESUME,
	.get_brightness = genericbl_get_intensity,
	.update_status  = genericbl_send_intensity,
};

static int genericbl_probe(struct platform_device *pdev)
{
	struct backlight_properties props;
	struct generic_bl_info *machinfo = dev_get_platdata(&pdev->dev);
	const char *name = "generic-bl";
	struct backlight_device *bd;

	bl_machinfo = machinfo;
	if (!machinfo->limit_mask)
		machinfo->limit_mask = -1;

	if (machinfo->name)
		name = machinfo->name;

	memset(&props, 0, sizeof(struct backlight_properties));
	props.type = BACKLIGHT_RAW;
	props.max_brightness = machinfo->max_intensity;
	bd = devm_backlight_device_register(&pdev->dev, name, &pdev->dev,
					NULL, &genericbl_ops, &props);
	if (IS_ERR(bd))
		return PTR_ERR(bd);

	platform_set_drvdata(pdev, bd);

	bd->props.power = FB_BLANK_UNBLANK;
	bd->props.brightness = machinfo->default_intensity;
	backlight_update_status(bd);

	generic_backlight_device = bd;

	dev_info(&pdev->dev, "Generic Backlight Driver Initialized.\n");
	return 0;
}

static int genericbl_remove(struct platform_device *pdev)
{
	struct backlight_device *bd = platform_get_drvdata(pdev);

	bd->props.power = 0;
	bd->props.brightness = 0;
	backlight_update_status(bd);

	dev_info(&pdev->dev, "Generic Backlight Driver Unloaded\n");
	return 0;
}

static struct platform_driver genericbl_driver = {
	.probe		= genericbl_probe,
	.remove		= genericbl_remove,
	.driver		= {
		.name	= "generic-bl",
	},
};

module_platform_driver(genericbl_driver);

MODULE_AUTHOR("Richard Purdie <rpurdie@rpsys.net>");
MODULE_DESCRIPTION("Generic Backlight Driver");
MODULE_LICENSE("GPL");
d=030305d69fc6963c16003f50d7e8d74b02d0a143'>rdma.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='030305d69fc6963c16003f50d7e8d74b02d0a143'/><table><tr><td colspan='2'/></tr><tr><td class='label'>context:</td><td class='ctrl'><select name='context' onchange='this.form.submit();'><option value='1'>1</option><option value='2'>2</option><option value='3' selected='selected'>3</option><option value='4'>4</option><option value='5'>5</option><option value='6'>6</option><option value='7'>7</option><option value='8'>8</option><option value='9'>9</option><option value='10'>10</option><option value='15'>15</option><option value='20'>20</option><option value='25'>25</option><option value='30'>30</option><option value='35'>35</option><option value='40'>40</option></select></td></tr><tr><td class='label'>space:</td><td class='ctrl'><select name='ignorews' onchange='this.form.submit();'><option value='0' selected='selected'>include</option><option value='1'>ignore</option></select></td></tr><tr><td class='label'>mode:</td><td class='ctrl'><select name='dt' onchange='this.form.submit();'><option value='0' selected='selected'>unified</option><option value='1'>ssdiff</option><option value='2'>stat only</option></select></td></tr><tr><td/><td class='ctrl'><noscript><input type='submit' value='reload'/></noscript></td></tr></table></form></div><table summary='commit info' class='commit-info'>
<tr><th>author</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>committer</th><td>Bjorn Helgaas &lt;bhelgaas@google.com&gt;</td><td class='right'>2017-01-27 15:00:45 -0600</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/rdma.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>030305d69fc6963c16003f50d7e8d74b02d0a143</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/rds/rdma.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>363a4e34d199178769b7e7eeb26ea2620a55847b</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/rds/rdma.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>net/rds/rdma.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/rds/rdma.c?id=4d191b1b63c209e37bf27938ef365244d3c41084'>4d191b1b63c209e37bf27938ef365244d3c41084</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/rds/rdma.c?id=030305d69fc6963c16003f50d7e8d74b02d0a143&amp;id2=4d191b1b63c209e37bf27938ef365244d3c41084'>diff</a>)</td></tr></table>
<div class='commit-subject'>PCI/ASPM: Handle PCI-to-PCIe bridges as roots of PCIe hierarchies</div><div class='commit-msg'>In a struct pcie_link_state, link-&gt;root points to the pcie_link_state of
the root of the PCIe hierarchy.  For the topmost link, this points to
itself (link-&gt;root = link).  For others, we copy the pointer from the
parent (link-&gt;root = link-&gt;parent-&gt;root).

Previously we recognized that Root Ports originated PCIe hierarchies, but
we treated PCI/PCI-X to PCIe Bridges as being in the middle of the
hierarchy, and when we tried to copy the pointer from link-&gt;parent-&gt;root,
there was no parent, and we dereferenced a NULL pointer:

  BUG: unable to handle kernel NULL pointer dereference at 0000000000000090
  IP: [&lt;ffffffff9e424350&gt;] pcie_aspm_init_link_state+0x170/0x820

Recognize that PCI/PCI-X to PCIe Bridges originate PCIe hierarchies just
like Root Ports do, so link-&gt;root for these devices should also point to
itself.

Fixes: 51ebfc92b72b ("PCI: Enumerate switches below PCI-to-PCIe bridges")
Link: https://bugzilla.kernel.org/show_bug.cgi?id=193411
Link: https://bugzilla.opensuse.org/show_bug.cgi?id=1022181
Tested-by: lists@ssl-mail.com
Tested-by: Jayachandran C. &lt;jnair@caviumnetworks.com&gt;
Signed-off-by: Bjorn Helgaas &lt;bhelgaas@google.com&gt;
CC: stable@vger.kernel.org	# v4.2+</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=030305d69fc6963c16003f50d7e8d74b02d0a143'>Diffstat</a> (limited to 'net/rds/rdma.c')</div><table summary='diffstat' class='diffstat'>