kernel/printk/nbcon.c

43  * The acquire mechanism uses a few more fields:
59  * The acquire mechanism uses three approaches:
61  *   1) Direct acquire when the console is not owned or is owned by a lower
97  * The acquire/release functions implement only minimal policies:
111  *     acquire()
193  * @ctxt:	Pointer to an acquire context that contains
194  *		all information about the acquire mode
216  * nbcon_context_try_acquire_direct - Try to acquire directly
220  * Acquire the console when it is released. Also acquire the console when
230  *			priority. No acquire method can be successful in
235  *			the handover acquire method.
248 		 * acquire ownership in order to satisfy the assumptions of  in nbcon_context_try_acquire_direct()
262 		 * The console should never be safe for a direct acquire  in nbcon_context_try_acquire_direct()
312  * nbcon_context_try_acquire_requested - Try to acquire after having
371 		 * The acquire could fail only when it has been taken  in nbcon_context_try_acquire_requested()
383  * nbcon_context_try_acquire_handover - Try to acquire via handover
416  *			The caller should retry with direct acquire.
428 	 * Check that the handover is called when the direct acquire failed  in nbcon_context_try_acquire_handover()
450 	 * Setup a request for the handover. The caller should try to acquire  in nbcon_context_try_acquire_handover()
460 	/* Wait until there is no owner and then acquire the console. */  in nbcon_context_try_acquire_handover()
462 		/* On successful acquire, this request is cleared. */  in nbcon_context_try_acquire_handover()
468 		 * If the acquire should be aborted, it must be ensured  in nbcon_context_try_acquire_handover()
503 		 * Unable to remove request. Try to acquire in case  in nbcon_context_try_acquire_handover()
508 	/* Lucky timing. The acquire succeeded while removing the request. */  in nbcon_context_try_acquire_handover()
513  * nbcon_context_try_acquire_hostile - Acquire via unsafe hostile takeover
517  * Acquire the console even in the unsafe state.
560  * nbcon_context_try_acquire - Try to acquire nbcon console
595 	/* Acquire succeeded. */  in nbcon_context_try_acquire()
1465  *	-EPERM:		Unable to acquire console ownership.
1473  * this context is not allowed to acquire the console. When -ENOENT is
1537 	 * a driver that will deadlock trying to acquire console ownership.  in nbcon_atomic_flush_pending_con()
1737  * nbcon_device_try_acquire - Try to acquire nbcon console and enter unsafe
1739  * @con:	The nbcon console to acquire