#ifndef _ASM_GENERIC_TERMIOS_H
#define _ASM_GENERIC_TERMIOS_H


#include <linux/uaccess.h>
#include <uapi/asm-generic/termios.h>

/*	intr=^C		quit=^\		erase=del	kill=^U
	eof=^D		vtime=\0	vmin=\1		sxtc=\0
	start=^Q	stop=^S		susp=^Z		eol=\0
	reprint=^R	discard=^U	werase=^W	lnext=^V
	eol2=\0
*/
#define INIT_C_CC "\003\034\177\025\004\0\1\0\021\023\032\0\022\017\027\026\0"

/*
 * Translate a "termio" structure into a "termios". Ugh.
 */
static inline int user_termio_to_kernel_termios(struct ktermios *termios,
						const struct termio __user *termio)
{
	unsigned short tmp;

	if (get_user(tmp, &termio->c_iflag) < 0)
		goto fault;
	termios->c_iflag = (0xffff0000 & termios->c_iflag) | tmp;

	if (get_user(tmp, &termio->c_oflag) < 0)
		goto fault;
	termios->c_oflag = (0xffff0000 & termios->c_oflag) | tmp;

	if (get_user(tmp, &termio->c_cflag) < 0)
		goto fault;
	termios->c_cflag = (0xffff0000 & termios->c_cflag) | tmp;

	if (get_user(tmp, &termio->c_lflag) < 0)
		goto fault;
	termios->c_lflag = (0xffff0000 & termios->c_lflag) | tmp;

	if (get_user(termios->c_line, &termio->c_line) < 0)
		goto fault;

	if (copy_from_user(termios->c_cc, termio->c_cc, NCC) != 0)
		goto fault;

	return 0;

 fault:
	return -EFAULT;
}

/*
 * Translate a "termios" structure into a "termio". Ugh.
 */
static inline int kernel_termios_to_user_termio(struct termio __user *termio,
						struct ktermios *termios)
{
	if (put_user(termios->c_iflag, &termio->c_iflag) < 0 ||
	    put_user(termios->c_oflag, &termio->c_oflag) < 0 ||
	    put_user(termios->c_cflag, &termio->c_cflag) < 0 ||
	    put_user(termios->c_lflag, &termio->c_lflag) < 0 ||
	    put_user(termios->c_line,  &termio->c_line) < 0 ||
	    copy_to_user(termio->c_cc, termios->c_cc, NCC) != 0)
		return -EFAULT;

	return 0;
}

#ifdef TCGETS2
static inline int user_termios_to_kernel_termios(struct ktermios *k,
						 struct termios2 __user *u)
{
	return copy_from_user(k, u, sizeof(struct termios2));
}

static inline int kernel_termios_to_user_termios(struct termios2 __user *u,
						 struct ktermios *k)
{
	return copy_to_user(u, k, sizeof(struct termios2));
}

static inline int user_termios_to_kernel_termios_1(struct ktermios *k,
						   struct termios __user *u)
{
	return copy_from_user(k, u, sizeof(struct termios));
}

static inline int kernel_termios_to_user_termios_1(struct termios __user *u,
						   struct ktermios *k)
{
	return copy_to_user(u, k, sizeof(struct termios));
}
#else /* TCGETS2 */
static inline int user_termios_to_kernel_termios(struct ktermios *k,
						 struct termios __user *u)
{
	return copy_from_user(k, u, sizeof(struct termios));
}

static inline int kernel_termios_to_user_termios(struct termios __user *u,
						 struct ktermios *k)
{
	return copy_to_user(u, k, sizeof(struct termios));
}
#endif /* TCGETS2 */

#endif /* _ASM_GENERIC_TERMIOS_H */
d></tr></table>
<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/commit/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>root</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/phonet?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>phonet</a>/<a href='/cgit.cgi/linux/net-next.git/commit/net/phonet/sysctl.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>sysctl.c</a></div><div class='content'><div class='cgit-panel'><b>diff options</b><form method='get'><input type='hidden' name='h' value='nds-private-remove'/><input type='hidden' name='id' value='433e19cf33d34bb6751c874a9c00980552fe508c'/><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>Dexuan Cui &lt;decui@microsoft.com&gt;</td><td class='right'>2017-01-28 11:46:02 -0700</td></tr>
<tr><th>committer</th><td>Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;</td><td class='right'>2017-01-31 10:59:48 +0100</td></tr>
<tr><th>commit</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/phonet/sysctl.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/net/phonet/sysctl.c?id=433e19cf33d34bb6751c874a9c00980552fe508c'>patch</a>)</td></tr>
<tr><th>tree</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/tree/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>ce6547ef2987fbb289fa28f03536328a42781651</a> /<a href='/cgit.cgi/linux/net-next.git/tree/net/phonet/sysctl.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>net/phonet/sysctl.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/net/phonet/sysctl.c?h=nds-private-remove&amp;id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/net/phonet/sysctl.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c&amp;id2=191e885a2e130e639bb0c8ee350d7047294f2ce6'>diff</a>)</td></tr></table>
<div class='commit-subject'>Drivers: hv: vmbus: finally fix hv_need_to_signal_on_read()</div><div class='commit-msg'>Commit a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")
added the proper mb(), but removed the test "prev_write_sz &lt; pending_sz"
when making the signal decision.

As a result, the guest can signal the host unnecessarily,
and then the host can throttle the guest because the host
thinks the guest is buggy or malicious; finally the user
running stress test can perceive intermittent freeze of
the guest.

This patch brings back the test, and properly handles the
in-place consumption APIs used by NetVSC (see get_next_pkt_raw(),
put_pkt_raw() and commit_rd_index()).

Fixes: a389fcfd2cb5 ("Drivers: hv: vmbus: Fix signaling logic in
hv_need_to_signal_on_read()")

Signed-off-by: Dexuan Cui &lt;decui@microsoft.com&gt;
Reported-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Tested-by: Rolf Neugebauer &lt;rolf.neugebauer@docker.com&gt;
Cc: "K. Y. Srinivasan" &lt;kys@microsoft.com&gt;
Cc: Haiyang Zhang &lt;haiyangz@microsoft.com&gt;
Cc: Stephen Hemminger &lt;sthemmin@microsoft.com&gt;
Cc: &lt;stable@vger.kernel.org&gt;
Signed-off-by: K. Y. Srinivasan &lt;kys@microsoft.com&gt;
Signed-off-by: Greg Kroah-Hartman &lt;gregkh@linuxfoundation.org&gt;
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>Diffstat</a> (limited to 'net/phonet/sysctl.c')</div><table summary='diffstat' class='diffstat'>