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Diffstat (limited to 'drivers/w1')
-rw-r--r--drivers/w1/w1.h5
-rw-r--r--drivers/w1/w1_netlink.c42
2 files changed, 30 insertions, 17 deletions
diff --git a/drivers/w1/w1.h b/drivers/w1/w1.h
index a096ef40119e..390a7307fb41 100644
--- a/drivers/w1/w1.h
+++ b/drivers/w1/w1.h
@@ -210,6 +210,11 @@ struct w1_master
struct w1_bus_master *bus_master;
u32 seq;
+ /* port id to send netlink responses to. The value is temporarily
+ * stored here while processing a message, set after locking the
+ * mutex, zero before unlocking the mutex.
+ */
+ u32 portid;
};
/**
diff --git a/drivers/w1/w1_netlink.c b/drivers/w1/w1_netlink.c
index b63109ada5a7..a5dc21934cf2 100644
--- a/drivers/w1/w1_netlink.c
+++ b/drivers/w1/w1_netlink.c
@@ -45,7 +45,7 @@ void w1_netlink_send(struct w1_master *dev, struct w1_netlink_msg *msg)
memcpy(w, msg, sizeof(struct w1_netlink_msg));
- cn_netlink_send(m, 0, 0, GFP_KERNEL);
+ cn_netlink_send(m, dev->portid, 0, GFP_KERNEL);
}
static void w1_send_slave(struct w1_master *dev, u64 rn)
@@ -60,7 +60,7 @@ static void w1_send_slave(struct w1_master *dev, u64 rn)
if (avail < 8) {
msg->ack++;
- cn_netlink_send(msg, 0, 0, GFP_KERNEL);
+ cn_netlink_send(msg, dev->portid, 0, GFP_KERNEL);
msg->len = sizeof(struct w1_netlink_msg) +
sizeof(struct w1_netlink_cmd);
@@ -131,7 +131,7 @@ static int w1_get_slaves(struct w1_master *dev,
}
msg->ack = 0;
- cn_netlink_send(msg, 0, 0, GFP_KERNEL);
+ cn_netlink_send(msg, dev->portid, 0, GFP_KERNEL);
dev->priv = NULL;
dev->priv_size = 0;
@@ -142,7 +142,7 @@ static int w1_get_slaves(struct w1_master *dev,
}
static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
- struct w1_netlink_cmd *cmd)
+ struct w1_netlink_cmd *cmd, u32 portid)
{
void *data;
struct w1_netlink_msg *h;
@@ -173,7 +173,7 @@ static int w1_send_read_reply(struct cn_msg *msg, struct w1_netlink_msg *hdr,
memcpy(c->data, cmd->data, c->len);
- err = cn_netlink_send(cm, 0, 0, GFP_KERNEL);
+ err = cn_netlink_send(cm, portid, 0, GFP_KERNEL);
kfree(data);
@@ -188,11 +188,11 @@ static int w1_process_command_io(struct w1_master *dev, struct cn_msg *msg,
switch (cmd->cmd) {
case W1_CMD_TOUCH:
w1_touch_block(dev, cmd->data, cmd->len);
- w1_send_read_reply(msg, hdr, cmd);
+ w1_send_read_reply(msg, hdr, cmd, dev->portid);
break;
case W1_CMD_READ:
w1_read_block(dev, cmd->data, cmd->len);
- w1_send_read_reply(msg, hdr, cmd);
+ w1_send_read_reply(msg, hdr, cmd, dev->portid);
break;
case W1_CMD_WRITE:
w1_write_block(dev, cmd->data, cmd->len);
@@ -283,7 +283,8 @@ static int w1_process_command_slave(struct w1_slave *sl, struct cn_msg *msg,
return w1_process_command_io(sl->master, msg, hdr, cmd);
}
-static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mcmd)
+static int w1_process_command_root(struct cn_msg *msg,
+ struct w1_netlink_msg *mcmd, u32 portid)
{
struct w1_master *m;
struct cn_msg *cn;
@@ -316,7 +317,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc
mutex_lock(&w1_mlock);
list_for_each_entry(m, &w1_masters, w1_master_entry) {
if (cn->len + sizeof(*id) > PAGE_SIZE - sizeof(struct cn_msg)) {
- cn_netlink_send(cn, 0, 0, GFP_KERNEL);
+ cn_netlink_send(cn, portid, 0, GFP_KERNEL);
cn->ack++;
cn->len = sizeof(struct w1_netlink_msg);
w->len = 0;
@@ -329,7 +330,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc
id++;
}
cn->ack = 0;
- cn_netlink_send(cn, 0, 0, GFP_KERNEL);
+ cn_netlink_send(cn, portid, 0, GFP_KERNEL);
mutex_unlock(&w1_mlock);
kfree(cn);
@@ -337,7 +338,7 @@ static int w1_process_command_root(struct cn_msg *msg, struct w1_netlink_msg *mc
}
static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rmsg,
- struct w1_netlink_cmd *rcmd, int error)
+ struct w1_netlink_cmd *rcmd, int portid, int error)
{
struct cn_msg *cmsg;
struct w1_netlink_msg *msg;
@@ -364,7 +365,7 @@ static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rm
cmsg->len += sizeof(*cmd);
}
- error = cn_netlink_send(cmsg, 0, 0, GFP_KERNEL);
+ error = cn_netlink_send(cmsg, portid, 0, GFP_KERNEL);
kfree(cmsg);
return error;
@@ -375,6 +376,7 @@ static int w1_netlink_send_error(struct cn_msg *rcmsg, struct w1_netlink_msg *rm
*/
struct w1_cb_block {
atomic_t refcnt;
+ u32 portid; /* Sending process port ID */
struct cn_msg msg;
/* cn_msg data */
/* one or more variable length struct w1_cb_node */
@@ -399,6 +401,7 @@ static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
struct w1_netlink_cmd *cmd = NULL;
mutex_lock(&dev->mutex);
+ dev->portid = node->block->portid;
if (sl && w1_reset_select_slave(sl))
err = -ENODEV;
@@ -417,7 +420,8 @@ static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
err = w1_process_command_master(dev, &node->block->msg,
node->m, cmd);
- w1_netlink_send_error(&node->block->msg, node->m, cmd, err);
+ w1_netlink_send_error(&node->block->msg, node->m, cmd,
+ node->block->portid, err);
err = 0;
cmd_data += cmd->len + sizeof(struct w1_netlink_cmd);
@@ -425,12 +429,14 @@ static void w1_process_cb(struct w1_master *dev, struct w1_async_cmd *async_cmd)
}
if (!cmd || err)
- w1_netlink_send_error(&node->block->msg, node->m, cmd, err);
+ w1_netlink_send_error(&node->block->msg, node->m, cmd,
+ node->block->portid, err);
if (sl)
w1_unref_slave(sl);
else
atomic_dec(&dev->refcnt);
+ dev->portid = 0;
mutex_unlock(&dev->mutex);
mutex_lock(&dev->list_mutex);
@@ -476,10 +482,12 @@ static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
node_count*sizeof(struct w1_cb_node);
block = kmalloc(size, GFP_KERNEL);
if (!block) {
- w1_netlink_send_error(msg, m, NULL, -ENOMEM);
+ w1_netlink_send_error(msg, m, NULL, nsp->portid,
+ -ENOMEM);
return;
}
atomic_set(&block->refcnt, 1);
+ block->portid = nsp->portid;
memcpy(&block->msg, msg, sizeof(*msg) + msg->len);
node = (struct w1_cb_node *)((u8 *)block->msg.data + msg->len);
}
@@ -509,7 +517,7 @@ static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
if (sl)
dev = sl->master;
} else {
- err = w1_process_command_root(msg, m);
+ err = w1_process_command_root(msg, m, nsp->portid);
goto out_cont;
}
@@ -538,7 +546,7 @@ static void w1_cn_callback(struct cn_msg *msg, struct netlink_skb_parms *nsp)
out_cont:
if (err)
- w1_netlink_send_error(msg, m, NULL, err);
+ w1_netlink_send_error(msg, m, NULL, nsp->portid, err);
msg_len -= sizeof(struct w1_netlink_msg) + m->len;
m = (struct w1_netlink_msg *)(((u8 *)m) + sizeof(struct w1_netlink_msg) + m->len);
generated by cgit v1.2.3 (git 2.39.1) at 2024-12-24 21:20:57 +0000