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-rw-r--r--drivers/xen/arm-device.c13
-rw-r--r--drivers/xen/preempt.c6
-rw-r--r--drivers/xen/pvcalls-back.c11
-rw-r--r--drivers/xen/pvcalls-front.c15
-rw-r--r--drivers/xen/xenbus/xenbus.h3
-rw-r--r--drivers/xen/xenbus/xenbus_dev_frontend.c18
-rw-r--r--drivers/xen/xenbus/xenbus_xs.c7
7 files changed, 30 insertions, 43 deletions
diff --git a/drivers/xen/arm-device.c b/drivers/xen/arm-device.c
index 3e789c77f568..87493f92291f 100644
--- a/drivers/xen/arm-device.c
+++ b/drivers/xen/arm-device.c
@@ -1,17 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (c) 2015, Linaro Limited, Shannon Zhao
- *
- * This program is free software; you can redistribute it and/or modify it
- * under the terms and conditions of the GNU General Public License,
- * version 2, as published by the Free Software Foundation.
- *
- * This program is distributed in the hope it will be useful, but WITHOUT
- * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
- * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
- * more details.
- *
- * You should have received a copy of the GNU General Public License
- * along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include <linux/platform_device.h>
diff --git a/drivers/xen/preempt.c b/drivers/xen/preempt.c
index 08cb419eb4e6..8b9919c26095 100644
--- a/drivers/xen/preempt.c
+++ b/drivers/xen/preempt.c
@@ -1,12 +1,8 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* Preemptible hypercalls
*
* Copyright (C) 2014 Citrix Systems R&D ltd.
- *
- * This source code is free software; you can redistribute it and/or
- * modify it under the terms of the GNU General Public License as
- * published by the Free Software Foundation; either version 2 of the
- * License, or (at your option) any later version.
*/
#include <linux/sched.h>
diff --git a/drivers/xen/pvcalls-back.c b/drivers/xen/pvcalls-back.c
index 7aa64d1b119c..69a626b0e594 100644
--- a/drivers/xen/pvcalls-back.c
+++ b/drivers/xen/pvcalls-back.c
@@ -1,15 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 2017 Stefano Stabellini <stefano@aporeto.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/inet.h>
diff --git a/drivers/xen/pvcalls-front.c b/drivers/xen/pvcalls-front.c
index 8a249c95c193..57592a6b5c9e 100644
--- a/drivers/xen/pvcalls-front.c
+++ b/drivers/xen/pvcalls-front.c
@@ -1,15 +1,6 @@
+// SPDX-License-Identifier: GPL-2.0-or-later
/*
* (c) 2017 Stefano Stabellini <stefano@aporeto.com>
- *
- * This program is free software; you can redistribute it and/or modify
- * it under the terms of the GNU General Public License as published by
- * the Free Software Foundation; either version 2 of the License, or
- * (at your option) any later version.
- *
- * This program is distributed in the hope that it will be useful,
- * but WITHOUT ANY WARRANTY; without even the implied warranty of
- * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
- * GNU General Public License for more details.
*/
#include <linux/module.h>
@@ -540,7 +531,6 @@ out:
int pvcalls_front_sendmsg(struct socket *sock, struct msghdr *msg,
size_t len)
{
- struct pvcalls_bedata *bedata;
struct sock_mapping *map;
int sent, tot_sent = 0;
int count = 0, flags;
@@ -552,7 +542,6 @@ int pvcalls_front_sendmsg(struct socket *sock, struct msghdr *msg,
map = pvcalls_enter_sock(sock);
if (IS_ERR(map))
return PTR_ERR(map);
- bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
mutex_lock(&map->active.out_mutex);
if ((flags & MSG_DONTWAIT) && !pvcalls_front_write_todo(map)) {
@@ -635,7 +624,6 @@ out:
int pvcalls_front_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
int flags)
{
- struct pvcalls_bedata *bedata;
int ret;
struct sock_mapping *map;
@@ -645,7 +633,6 @@ int pvcalls_front_recvmsg(struct socket *sock, struct msghdr *msg, size_t len,
map = pvcalls_enter_sock(sock);
if (IS_ERR(map))
return PTR_ERR(map);
- bedata = dev_get_drvdata(&pvcalls_front_dev->dev);
mutex_lock(&map->active.in_mutex);
if (len > XEN_FLEX_RING_SIZE(PVCALLS_RING_ORDER))
diff --git a/drivers/xen/xenbus/xenbus.h b/drivers/xen/xenbus/xenbus.h
index 092981171df1..d75a2385b37c 100644
--- a/drivers/xen/xenbus/xenbus.h
+++ b/drivers/xen/xenbus/xenbus.h
@@ -83,6 +83,7 @@ struct xb_req_data {
int num_vecs;
int err;
enum xb_req_state state;
+ bool user_req;
void (*cb)(struct xb_req_data *);
void *par;
};
@@ -133,4 +134,6 @@ void xenbus_ring_ops_init(void);
int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void *par);
void xenbus_dev_queue_reply(struct xb_req_data *req);
+extern unsigned int xb_dev_generation_id;
+
#endif
diff --git a/drivers/xen/xenbus/xenbus_dev_frontend.c b/drivers/xen/xenbus/xenbus_dev_frontend.c
index faf452d0edf0..08adc590f631 100644
--- a/drivers/xen/xenbus/xenbus_dev_frontend.c
+++ b/drivers/xen/xenbus/xenbus_dev_frontend.c
@@ -62,6 +62,8 @@
#include "xenbus.h"
+unsigned int xb_dev_generation_id;
+
/*
* An element of a list of outstanding transactions, for which we're
* still waiting a reply.
@@ -69,6 +71,7 @@
struct xenbus_transaction_holder {
struct list_head list;
struct xenbus_transaction handle;
+ unsigned int generation_id;
};
/*
@@ -441,6 +444,7 @@ static int xenbus_write_transaction(unsigned msg_type,
rc = -ENOMEM;
goto out;
}
+ trans->generation_id = xb_dev_generation_id;
list_add(&trans->list, &u->transactions);
} else if (msg->hdr.tx_id != 0 &&
!xenbus_get_transaction(u, msg->hdr.tx_id))
@@ -449,6 +453,20 @@ static int xenbus_write_transaction(unsigned msg_type,
!(msg->hdr.len == 2 &&
(!strcmp(msg->body, "T") || !strcmp(msg->body, "F"))))
return xenbus_command_reply(u, XS_ERROR, "EINVAL");
+ else if (msg_type == XS_TRANSACTION_END) {
+ trans = xenbus_get_transaction(u, msg->hdr.tx_id);
+ if (trans && trans->generation_id != xb_dev_generation_id) {
+ list_del(&trans->list);
+ kfree(trans);
+ if (!strcmp(msg->body, "T"))
+ return xenbus_command_reply(u, XS_ERROR,
+ "EAGAIN");
+ else
+ return xenbus_command_reply(u,
+ XS_TRANSACTION_END,
+ "OK");
+ }
+ }
rc = xenbus_dev_request_and_reply(&msg->hdr, u);
if (rc && trans) {
diff --git a/drivers/xen/xenbus/xenbus_xs.c b/drivers/xen/xenbus/xenbus_xs.c
index 49a3874ae6bb..ddc18da61834 100644
--- a/drivers/xen/xenbus/xenbus_xs.c
+++ b/drivers/xen/xenbus/xenbus_xs.c
@@ -105,6 +105,7 @@ static void xs_suspend_enter(void)
static void xs_suspend_exit(void)
{
+ xb_dev_generation_id++;
spin_lock(&xs_state_lock);
xs_suspend_active--;
spin_unlock(&xs_state_lock);
@@ -125,7 +126,7 @@ static uint32_t xs_request_enter(struct xb_req_data *req)
spin_lock(&xs_state_lock);
}
- if (req->type == XS_TRANSACTION_START)
+ if (req->type == XS_TRANSACTION_START && !req->user_req)
xs_state_users++;
xs_state_users++;
rq_id = xs_request_id++;
@@ -140,7 +141,7 @@ void xs_request_exit(struct xb_req_data *req)
spin_lock(&xs_state_lock);
xs_state_users--;
if ((req->type == XS_TRANSACTION_START && req->msg.type == XS_ERROR) ||
- (req->type == XS_TRANSACTION_END &&
+ (req->type == XS_TRANSACTION_END && !req->user_req &&
!WARN_ON_ONCE(req->msg.type == XS_ERROR &&
!strcmp(req->body, "ENOENT"))))
xs_state_users--;
@@ -286,6 +287,7 @@ int xenbus_dev_request_and_reply(struct xsd_sockmsg *msg, void *par)
req->num_vecs = 1;
req->cb = xenbus_dev_queue_reply;
req->par = par;
+ req->user_req = true;
xs_send(req, msg);
@@ -313,6 +315,7 @@ static void *xs_talkv(struct xenbus_transaction t,
req->vec = iovec;
req->num_vecs = num_vecs;
req->cb = xs_wake_up;
+ req->user_req = false;
msg.req_id = 0;
msg.tx_id = t.id;
generated by cgit v1.2.3-55-g7522 (git 2.39.0) at 2024-06-02 23:13:34 +0200