From 453823ba08ba762b3d58934b6dce75edce37169e Mon Sep 17 00:00:00 2001 From: Corey Minyard Date: Fri, 31 Mar 2006 02:30:39 -0800 Subject: [PATCH] IPMI: fix startup race condition Matt Domsch noticed a startup race with the IPMI kernel thread, it was possible (though extraordinarly unlikely) that a message could come in before the upper layer was ready to handle it. This patch splits the startup processing of an IPMI interface into two parts, one to get ready and one to actually start the processes to receive messages from the interface. [akpm@osdl.org: cleanups] Signed-off-by: Corey Minyard Cc: Matt Domsch Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/linux/ipmi_smi.h | 16 +++++++++++++--- 1 file changed, 13 insertions(+), 3 deletions(-) (limited to 'include/linux/ipmi_smi.h') diff --git a/include/linux/ipmi_smi.h b/include/linux/ipmi_smi.h index 53571288a9fc..6d9c7e4da472 100644 --- a/include/linux/ipmi_smi.h +++ b/include/linux/ipmi_smi.h @@ -82,6 +82,13 @@ struct ipmi_smi_handlers { struct module *owner; + /* The low-level interface cannot start sending messages to + the upper layer until this function is called. This may + not be NULL, the lower layer must take the interface from + this call. */ + int (*start_processing)(void *send_info, + ipmi_smi_t new_intf); + /* Called to enqueue an SMI message to be sent. This operation is not allowed to fail. If an error occurs, it should report back the error in a received message. It may @@ -157,13 +164,16 @@ static inline void ipmi_demangle_device_id(unsigned char *data, } /* Add a low-level interface to the IPMI driver. Note that if the - interface doesn't know its slave address, it should pass in zero. */ + interface doesn't know its slave address, it should pass in zero. + The low-level interface should not deliver any messages to the + upper layer until the start_processing() function in the handlers + is called, and the lower layer must get the interface from that + call. */ int ipmi_register_smi(struct ipmi_smi_handlers *handlers, void *send_info, struct ipmi_device_id *device_id, struct device *dev, - unsigned char slave_addr, - ipmi_smi_t *intf); + unsigned char slave_addr); /* * Remove a low-level interface from the IPMI driver. This will -- cgit v1.2.3