[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 <minyard@acm.org>
Cc: Matt Domsch <Matt_Domsch@dell.com>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 4 insertions, 5 deletions

diff --git a/drivers/char/ipmi/ipmi_msghandler.c b/drivers/char/ipmi/ipmi_msghandler.c
index 40eb005b9d7..a0b6f797d97 100644
--- a/drivers/char/ipmi/ipmi_msghandler.c
+++ b/drivers/char/ipmi/ipmi_msghandler.c
@@ -2305,8 +2305,7 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
                       void                     *send_info,
                       struct ipmi_device_id    *device_id,
                       struct device            *si_dev,
-                      unsigned char            slave_addr,
-                      ipmi_smi_t               *new_intf)
+                      unsigned char            slave_addr)
 {
         int              i, j;
         int              rv;
@@ -2388,9 +2387,9 @@ int ipmi_register_smi(struct ipmi_smi_handlers *handlers,
         if (rv)
                 goto out;
 
-        /* FIXME - this is an ugly kludge, this sets the intf for the
-           caller before sending any messages with it. */
-        *new_intf = intf;
+        rv = handlers->start_processing(send_info, intf);
+        if (rv)
+                goto out;
 
         get_guid(intf);