Merge tag 'for-linus-6.16-1' of https://github.com/cminyard/linux-ipmi

Pull IPMI updates from Corey Minyard:
 "Restructure the IPMI driver.

  This is a restructure of the IPMI driver, mostly to remove SRCU. The
  locking had issues, and they were not going to be straightforward to
  fix. Plus it used tons of memory and was generally a pain.

  Most of this moves handling of messages out of bh and interrupt
  context and runs it in thread context. Then getting rid of SRCU is
  easy.

  This also has a minor cleanup to remove a warning on newer GCCs and to
  fix some documentation"

* tag 'for-linus-6.16-1' of https://github.com/cminyard/linux-ipmi: (26 commits)
  docs: ipmi: fix spelling and grammar mistakes
  ipmi:msghandler: Fix potential memory corruption in ipmi_create_user()
  ipmi:watchdog: Use the new interface for panic messages
  ipmi:msghandler: Export and fix panic messaging capability
  Documentation:ipmi: Remove comments about interrupt level
  ipmi:ssif: Fix a shutdown race
  ipmi:msghandler: Don't deliver messages to deleted users
  ipmi:si: Rework startup of IPMI devices
  ipmi:msghandler: Add a error return from unhandle LAN cmds
  ipmi:msghandler: Shut down lower layer first at unregister
  ipmi:msghandler: Remove proc_fs.h
  ipmi:msghandler: Don't check for shutdown when returning responses
  ipmi:msghandler: Don't acquire a user refcount for queued messages
  ipmi:msghandler: Fix locking around users and interfaces
  ipmi:msghandler: Remove some user level processing in panic mode
  ipmi: Add a note about the pretimeout callback
  ipmi:watchdog: Change lock to mutex
  ipmi:msghandler: Remove srcu for the ipmi_interfaces list
  ipmi:msghandler: Remove srcu from the ipmi user structure
  ipmi:msghandler: Use the system_wq, not system_bh_wq
  ...

1 files changed, 12 insertions, 1 deletions

diff --git a/include/linux/ipmi.h b/include/linux/ipmi.h
index 2f74dd90c271..7da6602eab71 100644
--- a/include/linux/ipmi.h
+++ b/include/linux/ipmi.h
@@ -93,7 +93,8 @@ struct ipmi_user_hndl {
 
 	/*
 	 * Called when the interface detects a watchdog pre-timeout.  If
-	 * this is NULL, it will be ignored for the user.
+	 * this is NULL, it will be ignored for the user.  Note that you
+	 * can't do any IPMI calls from here, it's called with locks held.
 	 */
 	void (*ipmi_watchdog_pretimeout)(void *handler_data);
 
@@ -343,4 +344,14 @@ extern int ipmi_get_smi_info(int if_num, struct ipmi_smi_info *data);
 /* Helper function for computing the IPMB checksum of some data. */
 unsigned char ipmb_checksum(unsigned char *data, int size);
 
+/*
+ * For things that must send messages at panic time, like the IPMI watchdog
+ * driver that extends the reset time on a panic, use this to send messages
+ * from panic context.  Note that this puts the driver into a mode that
+ * only works at panic time, so only use it then.
+ */
+void ipmi_panic_request_and_wait(struct ipmi_user *user,
+				 struct ipmi_addr *addr,
+				 struct kernel_ipmi_msg *msg);
+
 #endif /* __LINUX_IPMI_H */