Input: serio - define serio_pause_rx guard to pause and resume serio ports

[ Upstream commit 0e45a09a1d ]

serio_pause_rx() and serio_continue_rx() are usually used together to
temporarily stop receiving interrupts/data for a given serio port.
Define "serio_pause_rx" guard for this so that the port is always
resumed once critical section is over.

Example:

	scoped_guard(serio_pause_rx, elo->serio) {
		elo->expected_packet = toupper(packet[0]);
		init_completion(&elo->cmd_done);
	}

Link: https://lore.kernel.org/r/20240905041732.2034348-2-dmitry.torokhov@gmail.com
Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com>
Stable-dep-of: 08bd5b7c9a ("Input: synaptics - fix crash when enabling pass-through port")
Signed-off-by: Sasha Levin <sashal@kernel.org>

include/linux/serio.h

@@ -6,6 +6,7 @@
 #define _SERIO_H
 
 
+#include <linux/cleanup.h>
 #include <linux/types.h>
 #include <linux/interrupt.h>
 #include <linux/list.h>
@@ -161,4 +162,6 @@ static inline void serio_continue_rx(struct serio *serio)
 	spin_unlock_irq(&serio->lock);
 }
 
+DEFINE_GUARD(serio_pause_rx, struct serio *, serio_pause_rx(_T), serio_continue_rx(_T))
+
 #endif