/**
 * ulpi.c - DesignWare USB3 Controller's ULPI PHY interface
 *
 * Copyright (C) 2015 Intel Corporation
 *
 * Author: Heikki Krogerus <heikki.krogerus@linux.intel.com>
 *
 * 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/ulpi/regs.h>

#include "core.h"
#include "io.h"

#define DWC3_ULPI_ADDR(a) \
		((a >= ULPI_EXT_VENDOR_SPECIFIC) ? \
		DWC3_GUSB2PHYACC_ADDR(ULPI_ACCESS_EXTENDED) | \
		DWC3_GUSB2PHYACC_EXTEND_ADDR(a) : DWC3_GUSB2PHYACC_ADDR(a))

static int dwc3_ulpi_busyloop(struct dwc3 *dwc)
{
	unsigned count = 1000;
	u32 reg;

	while (count--) {
		reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));
		if (!(reg & DWC3_GUSB2PHYACC_BUSY))
			return 0;
		cpu_relax();
	}

	return -ETIMEDOUT;
}

static int dwc3_ulpi_read(struct device *dev, u8 addr)
{
	struct dwc3 *dwc = dev_get_drvdata(dev);
	u32 reg;
	int ret;

	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);

	ret = dwc3_ulpi_busyloop(dwc);
	if (ret)
		return ret;

	reg = dwc3_readl(dwc->regs, DWC3_GUSB2PHYACC(0));

	return DWC3_GUSB2PHYACC_DATA(reg);
}

static int dwc3_ulpi_write(struct device *dev, u8 addr, u8 val)
{
	struct dwc3 *dwc = dev_get_drvdata(dev);
	u32 reg;

	reg = DWC3_GUSB2PHYACC_NEWREGREQ | DWC3_ULPI_ADDR(addr);
	reg |= DWC3_GUSB2PHYACC_WRITE | val;
	dwc3_writel(dwc->regs, DWC3_GUSB2PHYACC(0), reg);

	return dwc3_ulpi_busyloop(dwc);
}

static const struct ulpi_ops dwc3_ulpi_ops = {
	.read = dwc3_ulpi_read,
	.write = dwc3_ulpi_write,
};

int dwc3_ulpi_init(struct dwc3 *dwc)
{
	/* Register the interface */
	dwc->ulpi = ulpi_register_interface(dwc->dev, &dwc3_ulpi_ops);
	if (IS_ERR(dwc->ulpi)) {
		dev_err(dwc->dev, "failed to register ULPI interface");
		return PTR_ERR(dwc->ulpi);
	}

	return 0;
}

void dwc3_ulpi_exit(struct dwc3 *dwc)
{
	if (dwc->ulpi) {
		ulpi_unregister_interface(dwc->ulpi);
		dwc->ulpi = NULL;
	}
}
.cgi/linux/net-next.git/log/'>
<input type='hidden' name='id' value='b403f0e37a11f84f7ceaf40b0075499e5bcfd220'/><select name='qt'>
<option value='grep'>log msg</option>
<option value='author'>author</option>
<option value='committer'>committer</option>
<option value='range'>range</option>
</select>
<input class='txt' type='search' size='10' name='q' value=''/>
<input type='submit' value='search'/>
</form>
</td></tr></table>
<div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='id' value='b403f0e37a11f84f7ceaf40b0075499e5bcfd220'/><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>Miklos Szeredi &lt;mszeredi@redhat.com&gt;</td><td class='right'>2016-06-29 10:54:23 +0200</td></tr>
<tr><th>committer</th><td>Al Viro &lt;viro@zeniv.linux.org.uk&gt;</td><td class='right'>2016-06-30 23:28:09 -0400</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=b403f0e37a11f84f7ceaf40b0075499e5bcfd220'>b403f0e37a11f84f7ceaf40b0075499e5bcfd220</a> (<a href='/cgit.cgi/linux/net-next.git/patch/?id=b403f0e37a11f84f7ceaf40b0075499e5bcfd220'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?id=b403f0e37a11f84f7ceaf40b0075499e5bcfd220'>50cece69d070007009655f40e488c20da578b990</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/?id=b42b90d177d0c7f46f9c888c10c7900578ae7e09'>b42b90d177d0c7f46f9c888c10c7900578ae7e09</a> (<a href='/cgit.cgi/linux/net-next.git/diff/?id=b403f0e37a11f84f7ceaf40b0075499e5bcfd220&amp;id2=b42b90d177d0c7f46f9c888c10c7900578ae7e09'>diff</a>)</td></tr></table>
<div class='commit-subject'>9p: use file_dentry()</div><div class='commit-msg'>v9fs may be used as lower layer of overlayfs and accessing f_path.dentry
can lead to a crash.  In this case it's a NULL pointer dereference in
p9_fid_create().

Fix by replacing direct access of file-&gt;f_path.dentry with the
file_dentry() accessor, which will always return a native object.

Reported-by: Alessio Igor Bogani &lt;alessioigorbogani@gmail.com&gt;
Signed-off-by: Miklos Szeredi &lt;mszeredi@redhat.com&gt;
Tested-by: Alessio Igor Bogani &lt;alessioigorbogani@gmail.com&gt;
Fixes: 4bacc9c9234c ("overlayfs: Make f_path always point to the overlay and f_inode to the underlay")
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: Al Viro &lt;viro@zeniv.linux.org.uk&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?id=b403f0e37a11f84f7ceaf40b0075499e5bcfd220'>Diffstat</a></div><table summary='diffstat' class='diffstat'>