/*
 * 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/kernel.h>
#include <linux/types.h>
#include <linux/errno.h>
#include <linux/slab.h>
#include <linux/module.h>
#include <linux/pkt_sched.h>
#include <net/caif/caif_layer.h>
#include <net/caif/cfsrvl.h>
#include <net/caif/cfpkt.h>
#include <net/caif/caif_dev.h>

#define SRVL_CTRL_PKT_SIZE 1
#define SRVL_FLOW_OFF 0x81
#define SRVL_FLOW_ON  0x80
#define SRVL_SET_PIN  0x82
#define SRVL_CTRL_PKT_SIZE 1

#define container_obj(layr) container_of(layr, struct cfsrvl, layer)

static void cfservl_ctrlcmd(struct cflayer *layr, enum caif_ctrlcmd ctrl,
			    int phyid)
{
	struct cfsrvl *service = container_obj(layr);

	if (layr->up == NULL || layr->up->ctrlcmd == NULL)
		return;

	switch (ctrl) {
	case CAIF_CTRLCMD_INIT_RSP:
		service->open = true;
		layr->up->ctrlcmd(layr->up, ctrl, phyid);
		break;
	case CAIF_CTRLCMD_DEINIT_RSP:
	case CAIF_CTRLCMD_INIT_FAIL_RSP:
		service->open = false;
		layr->up->ctrlcmd(layr->up, ctrl, phyid);
		break;
	case _CAIF_CTRLCMD_PHYIF_FLOW_OFF_IND:
		if (phyid != service->dev_info.id)
			break;
		if (service->modem_flow_on)
			layr->up->ctrlcmd(layr->up,
					  CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
		service->phy_flow_on = false;
		break;
	case _CAIF_CTRLCMD_PHYIF_FLOW_ON_IND:
		if (phyid != service->dev_info.id)
			return;
		if (service->modem_flow_on) {
			layr->up->ctrlcmd(layr->up,
					   CAIF_CTRLCMD_FLOW_ON_IND,
					   phyid);
		}
		service->phy_flow_on = true;
		break;
	case CAIF_CTRLCMD_FLOW_OFF_IND:
		if (service->phy_flow_on) {
			layr->up->ctrlcmd(layr->up,
					  CAIF_CTRLCMD_FLOW_OFF_IND, phyid);
		}
		service->modem_flow_on = false;
		break;
	case CAIF_CTRLCMD_FLOW_ON_IND:
		if (service->phy_flow_on) {
			layr->up->ctrlcmd(layr->up,
					  CAIF_CTRLCMD_FLOW_ON_IND, phyid);
		}
		service->modem_flow_on = true;
		break;
	case _CAIF_CTRLCMD_PHYIF_DOWN_IND:
		/* In case interface is down, let's fake a remove shutdown */
		layr->up->ctrlcmd(layr->up,
				CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND, phyid);
		break;
	case CAIF_CTRLCMD_REMOTE_SHUTDOWN_IND:
		layr->up->ctrlcmd(layr->up, ctrl, phyid);
		break;
	default:
		pr_warn("Unexpected ctrl in cfsrvl (%d)\n", ctrl);
		/* We have both modem and phy flow on, send flow on */
		layr->up->ctrlcmd(layr->up, ctrl, phyid);
		service->phy_flow_on = true;
		break;
	}
}

static int cfservl_modemcmd(struct cflayer *layr, enum caif_modemcmd ctrl)
{
	struct cfsrvl *service = container_obj(layr);

	caif_assert(layr != NULL);
	caif_assert(layr->dn != NULL);
	caif_assert(layr->dn->transmit != NULL);

	if (!service->supports_flowctrl)
		return 0;

	switch (ctrl) {
	case CAIF_MODEMCMD_FLOW_ON_REQ:
		{
			struct cfpkt *pkt;
			struct caif_payload_info *info;
			u8 flow_on = SRVL_FLOW_ON;
			pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
			if (!pkt)
				return -ENOMEM;

			if (cfpkt_add_head(pkt, &flow_on, 1) < 0) {
				pr_err("Packet is erroneous!\n");
				cfpkt_destroy(pkt);
				return -EPROTO;
			}
			info = cfpkt_info(pkt);
			info->channel_id = service->layer.id;
			info->hdr_len = 1;
			info->dev_info = &service->dev_info;
			cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
			return layr->dn->transmit(layr->dn, pkt);
		}
	case CAIF_MODEMCMD_FLOW_OFF_REQ:
		{
			struct cfpkt *pkt;
			struct caif_payload_info *info;
			u8 flow_off = SRVL_FLOW_OFF;
			pkt = cfpkt_create(SRVL_CTRL_PKT_SIZE);
			if (!pkt)
				return -ENOMEM;

			if (cfpkt_add_head(pkt, &flow_off, 1) < 0) {
				pr_err("Packet is erroneous!\n");
				cfpkt_destroy(pkt);
				return -EPROTO;
			}
			info = cfpkt_info(pkt);
			info->channel_id = service->layer.id;
			info->hdr_len = 1;
			info->dev_info = &service->dev_info;
			cfpkt_set_prio(pkt, TC_PRIO_CONTROL);
			return layr->dn->transmit(layr->dn, pkt);
		}
	default:
	  break;
	}
	return -EINVAL;
}

static void cfsrvl_release(struct cflayer *layer)
{
	struct cfsrvl *service = container_of(layer, struct cfsrvl, layer);
	kfree(service);
}

void cfsrvl_init(struct cfsrvl *service,
		 u8 channel_id,
		 struct dev_info *dev_info,
		 bool supports_flowctrl)
{
	caif_assert(offsetof(struct cfsrvl, layer) == 0);
	service->open = false;
	service->modem_flow_on = true;
	service->phy_flow_on = true;
	service->layer.id = channel_id;
	service->layer.ctrlcmd = cfservl_ctrlcmd;
	service->layer.modemcmd = cfservl_modemcmd;
	service->dev_info = *dev_info;
	service->supports_flowctrl = supports_flowctrl;
	service->release = cfsrvl_release;
}

bool cfsrvl_ready(struct cfsrvl *service, int *err)
{
	if (!service->open) {
		*err = -ENOTCONN;
		return false;
	}
	return true;
}

u8 cfsrvl_getphyid(struct cflayer *layer)
{
	struct cfsrvl *servl = container_obj(layer);
	return servl->dev_info.id;
}

bool cfsrvl_phyid_match(struct cflayer *layer, int phyid)
{
	struct cfsrvl *servl = container_obj(layer);
	return servl->dev_info.id == phyid;
}

void caif_free_client(struct cflayer *adap_layer)
{
	struct cfsrvl *servl;
	if (adap_layer == NULL || adap_layer->dn == NULL)
		return;
	servl = container_obj(adap_layer->dn);
	servl->release(&servl->layer);
}
EXPORT_SYMBOL(caif_free_client);

void caif_client_register_refcnt(struct cflayer *adapt_layer,
				 void (*hold)(struct cflayer *lyr),
				 void (*put)(struct cflayer *lyr))
{
	struct cfsrvl *service;

	if (WARN_ON(adapt_layer == NULL || adapt_layer->dn == NULL))
		return;
	service = container_of(adapt_layer->dn, struct cfsrvl, layer);
	service->hold = hold;
	service->put = put;
}
EXPORT_SYMBOL(caif_client_register_refcnt);
/linux/net-next.git/tree/?h=nds-private-remove&amp;id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>75f65eba7eac9277971082a2d5a4cf1370562c0c</a> /<a href='/cgit.cgi/linux/net-next.git/tree/include/drm/drm_drv.h?h=nds-private-remove&amp;id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>include/drm/drm_drv.h</a></td></tr>
<tr><th>parent</th><td colspan='2' class='oid'><a href='/cgit.cgi/linux/net-next.git/commit/include/drm/drm_drv.h?h=nds-private-remove&amp;id=7ce7d89f48834cefece7804d38fc5d85382edf77'>7ce7d89f48834cefece7804d38fc5d85382edf77</a> (<a href='/cgit.cgi/linux/net-next.git/diff/include/drm/drm_drv.h?h=nds-private-remove&amp;id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a&amp;id2=7ce7d89f48834cefece7804d38fc5d85382edf77'>diff</a>)</td></tr></table>
<div class='commit-subject'>cgroup: don't online subsystems before cgroup_name/path() are operational</div><div class='commit-msg'>While refactoring cgroup creation, a5bca2152036 ("cgroup: factor out
cgroup_create() out of cgroup_mkdir()") incorrectly onlined subsystems
before the new cgroup is associated with it kernfs_node.  This is fine
for cgroup proper but cgroup_name/path() depend on the associated
kernfs_node and if a subsystem makes the new cgroup_subsys_state
visible, which they're allowed to after onlining, it can lead to NULL
dereference.

The current code performs cgroup creation and subsystem onlining in
cgroup_create() and cgroup_mkdir() makes the cgroup and subsystems
visible afterwards.  There's no reason to online the subsystems early
and we can simply drop cgroup_apply_control_enable() call from
cgroup_create() so that the subsystems are onlined and made visible at
the same time.

Signed-off-by: Tejun Heo &lt;tj@kernel.org&gt;
Reported-by: Konstantin Khlebnikov &lt;khlebnikov@yandex-team.ru&gt;
Fixes: a5bca2152036 ("cgroup: factor out cgroup_create() out of cgroup_mkdir()") 
Cc: stable@vger.kernel.org # v4.6+
</div><div class='diffstat-header'><a href='/cgit.cgi/linux/net-next.git/diff/?h=nds-private-remove&amp;id=07cd12945551b63ecb1a349d50a6d69d1d6feb4a'>Diffstat</a> (limited to 'include/drm/drm_drv.h')</div><table summary='diffstat' class='diffstat'>