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tipc: convert config_lock from spinlock to mutex

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As the configuration server is now running under process context,
it's unnecessary for us to have a spinlock serializing the TIPC
configuration process. Instead, we replace it with a mutex lock,
which gives us more freedom. For instance, we can now call
pre-emptable functions within the protected area.

Signed-off-by: Ying Xue <ying.xue@windriver.com>
Signed-off-by: Jon Maloy <jon.maloy@ericsson.com>
Signed-off-by: Paul Gortmaker <paul.gortmaker@windriver.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Ying Xue 2013-06-17 10:54:45 -04:00 committed by David S. Miller
parent 3c5db8e4ec
commit 28e5297281
1 changed files with 3 additions and 14 deletions
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17
net/tipc/config.c
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@ -42,7 +42,7 @@
#define REPLY_TRUNCATED "<truncated>\n"
static DEFINE_SPINLOCK(config_lock);
static DEFINE_MUTEX(config_mutex);
static struct tipc_server cfgsrv;
static const void *req_tlv_area; /* request message TLV area */
@ -181,18 +181,7 @@ static struct sk_buff *cfg_set_own_addr(void)
if (tipc_own_addr)
return tipc_cfg_reply_error_string(TIPC_CFG_NOT_SUPPORTED
" (cannot change node address once assigned)");
/*
* Must temporarily release configuration spinlock while switching into
* networking mode as it calls tipc_eth_media_start(), which may sleep.
* Releasing the lock is harmless as other locally-issued configuration
* commands won't occur until this one completes, and remotely-issued
* configuration commands can't be received until a local configuration
* command to enable the first bearer is received and processed.
*/
spin_unlock_bh(&config_lock);
tipc_core_start_net(addr);
spin_lock_bh(&config_lock);
return tipc_cfg_reply_none();
}
@ -248,7 +237,7 @@ struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area
{
struct sk_buff *rep_tlv_buf;
spin_lock_bh(&config_lock);
mutex_lock(&config_mutex);
/* Save request and reply details in a well-known location */
req_tlv_area = request_area;
@ -377,7 +366,7 @@ struct sk_buff *tipc_cfg_do_cmd(u32 orig_node, u16 cmd, const void *request_area
/* Return reply buffer */
exit:
spin_unlock_bh(&config_lock);
mutex_unlock(&config_mutex);
return rep_tlv_buf;
}