/*
 * Copyright (C) ST-Ericsson AB 2010
 * Author:	Sjur Brendeland
 * License terms: GNU General Public License (GPL) version 2
 */

#define pr_fmt(fmt) KBUILD_MODNAME ":%s(): " fmt, __func__

#include <linux/stddef.h>
#include <linux/slab.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>

#define container_obj(layr) ((struct cfsrvl *) layr)

static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt);
static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt);

struct cflayer *cfdbgl_create(u8 channel_id, struct dev_info *dev_info)
{
	struct cfsrvl *dbg = kzalloc(sizeof(struct cfsrvl), GFP_ATOMIC);
	if (!dbg)
		return NULL;
	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	cfsrvl_init(dbg, channel_id, dev_info, false);
	dbg->layer.receive = cfdbgl_receive;
	dbg->layer.transmit = cfdbgl_transmit;
	snprintf(dbg->layer.name, CAIF_LAYER_NAME_SZ - 1, "dbg%d", channel_id);
	return &dbg->layer;
}

static int cfdbgl_receive(struct cflayer *layr, struct cfpkt *pkt)
{
	return layr->up->receive(layr->up, pkt);
}

static int cfdbgl_transmit(struct cflayer *layr, struct cfpkt *pkt)
{
	struct cfsrvl *service = container_obj(layr);
	struct caif_payload_info *info;
	int ret;

	if (!cfsrvl_ready(service, &ret)) {
		cfpkt_destroy(pkt);
		return ret;
	}

	/* Add info for MUX-layer to route the packet out */
	info = cfpkt_info(pkt);
	info->channel_id = service->layer.id;
	info->dev_info = &service->dev_info;

	return layr->dn->transmit(layr->dn, pkt);
}
r><td>
<a href='/cgit.cgi/linux/net-next.git/?h=nds-private-remove'>summary</a><a href='/cgit.cgi/linux/net-next.git/refs/?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>refs</a><a class='active' href='/cgit.cgi/linux/net-next.git/log/sound/soc/img/Kconfig?h=nds-private-remove'>log</a><a href='/cgit.cgi/linux/net-next.git/tree/sound/soc/img/Kconfig?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>tree</a><a href='/cgit.cgi/linux/net-next.git/commit/sound/soc/img/Kconfig?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>commit</a><a href='/cgit.cgi/linux/net-next.git/diff/sound/soc/img/Kconfig?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>diff</a></td><td class='form'><form class='right' method='get' action='/cgit.cgi/linux/net-next.git/log/sound/soc/img/Kconfig'>
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<div class='path'>path: <a href='/cgit.cgi/linux/net-next.git/log/?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>root</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>sound</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>soc</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/img?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>img</a>/<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/img/Kconfig?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211'>Kconfig</a></div><div class='content'><table class='list nowrap'><tr class='nohover'><th class='left'>Age</th><th class='left'>Commit message (<a href='/cgit.cgi/linux/net-next.git/log/sound/soc/img/Kconfig?h=nds-private-remove&amp;id=3374c3ab7f61cf820854cfe36405e4dcfc22a211&amp;showmsg=1'>Expand</a>)</th><th class='left'>Author</th><th class='left'>Files</th><th class='left'>Lines</th></tr>
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<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/sound/pci/aw2/aw2-saa7146.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>433e19cf33d34bb6751c874a9c00980552fe508c</a> (<a href='/cgit.cgi/linux/net-next.git/patch/sound/pci/aw2/aw2-saa7146.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/sound/pci/aw2/aw2-saa7146.c?h=nds-private-remove&amp;id=433e19cf33d34bb6751c874a9c00980552fe508c'>sound/pci/aw2/aw2-saa7146.c</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/sound/pci/aw2/aw2-saa7146.c?h=nds-private-remove&amp;id=191e885a2e130e639bb0c8ee350d7047294f2ce6'>191e885a2e130e639bb0c8ee350d7047294f2ce6</a> (<a href='/cgit.cgi/linux/net-next.git/diff/sound/pci/aw2/aw2-saa7146.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 'sound/pci/aw2/aw2-saa7146.c')</div><table summary='diffstat' class='diffstat'>