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

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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>
This commit is contained in:
Hendrik Brueckner
2008-12-25 13:38:58 +01:00
committed by Martin Schwidefsky
parent 44a01d5ba8
commit 91d5d45ee0
2 changed files with 161 additions and 36 deletions
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45
include/net/iucv/iucv.h
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@@ -337,11 +337,34 @@ 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
@@ -386,11 +409,33 @@ 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