[S390] iucv: Locking free version of iucv_message_(receive|send)

Provide a locking free version of iucv_message_receive and iucv_message_send
that do not call local_bh_enable in a spin_lock_(bh|irqsave)() context.

Signed-off-by: Hendrik Brueckner <brueckner@linux.vnet.ibm.com>

1 files changed, 45 insertions, 0 deletions

diff --git a/include/net/iucv/iucv.h b/include/net/iucv/iucv.h
index fd70adbb3566..5e310c8d8e2f 100644
--- a/include/net/iucv/iucv.h
+++ b/include/net/iucv/iucv.h
@@ -337,12 +337,35 @@ int iucv_message_purge(struct iucv_path *path, struct iucv_message *msg,
  * established paths. This function will deal with RMDATA messages
  * embedded in struct iucv_message as well.
  *
+ * Locking:	local_bh_enable/local_bh_disable
+ *
  * Returns the result from the CP IUCV call.
  */
 int iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
 			 u8 flags, void *buffer, size_t size, size_t *residual);
 
 /**
+ * __iucv_message_receive
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: flags that affect how the message is received (IUCV_IPBUFLST)
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of data buffer
+ * @residual:
+ *
+ * This function receives messages that are being sent to you over
+ * established paths. This function will deal with RMDATA messages
+ * embedded in struct iucv_message as well.
+ *
+ * Locking:	no locking.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_receive(struct iucv_path *path, struct iucv_message *msg,
+			   u8 flags, void *buffer, size_t size,
+			   size_t *residual);
+
+/**
  * iucv_message_reject
  * @path: address of iucv path structure
  * @msg: address of iucv msg structure
@@ -386,12 +409,34 @@ int iucv_message_reply(struct iucv_path *path, struct iucv_message *msg,
  * transmitted is in a buffer and this is a one-way message and the
  * receiver will not reply to the message.
  *
+ * Locking:	local_bh_enable/local_bh_disable
+ *
  * Returns the result from the CP IUCV call.
  */
 int iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
 		      u8 flags, u32 srccls, void *buffer, size_t size);
 
 /**
+ * __iucv_message_send
+ * @path: address of iucv path structure
+ * @msg: address of iucv msg structure
+ * @flags: how the message is sent (IUCV_IPRMDATA, IUCV_IPPRTY, IUCV_IPBUFLST)
+ * @srccls: source class of message
+ * @buffer: address of data buffer or address of struct iucv_array
+ * @size: length of send buffer
+ *
+ * This function transmits data to another application. Data to be
+ * transmitted is in a buffer and this is a one-way message and the
+ * receiver will not reply to the message.
+ *
+ * Locking:	no locking.
+ *
+ * Returns the result from the CP IUCV call.
+ */
+int __iucv_message_send(struct iucv_path *path, struct iucv_message *msg,
+			u8 flags, u32 srccls, void *buffer, size_t size);
+
+/**
  * iucv_message_send2way
  * @path: address of iucv path structure
  * @msg: address of iucv msg structure