Revert "xen/events/fifo: Handle linked events when closing a port"

This reverts commit fcdf31a7c162de0c93a2bee51df4688ab0a348f8.

This was causing a WARNING whenever a PIRQ was closed since
shutdown_pirq() is called with irqs disabled.

Signed-off-by: David Vrabel <david.vrabel@citrix.com>
Cc: <stable@vger.kernel.org>

1 files changed, 5 insertions, 40 deletions

diff --git a/drivers/xen/events/events_fifo.c b/drivers/xen/events/events_fifo.c
index 6df8aac966b9..ed673e1acd61 100644
--- a/drivers/xen/events/events_fifo.c
+++ b/drivers/xen/events/events_fifo.c
@@ -255,12 +255,6 @@ static void evtchn_fifo_unmask(unsigned port)
 	}
 }
 
-static bool evtchn_fifo_is_linked(unsigned port)
-{
-	event_word_t *word = event_word_from_port(port);
-	return sync_test_bit(EVTCHN_FIFO_BIT(LINKED, word), BM(word));
-}
-
 static uint32_t clear_linked(volatile event_word_t *word)
 {
 	event_word_t new, old, w;
@@ -287,8 +281,7 @@ static void handle_irq_for_port(unsigned port)
 
 static void consume_one_event(unsigned cpu,
 			      struct evtchn_fifo_control_block *control_block,
-			      unsigned priority, unsigned long *ready,
-			      bool drop)
+			      unsigned priority, unsigned long *ready)
 {
 	struct evtchn_fifo_queue *q = &per_cpu(cpu_queue, cpu);
 	uint32_t head;
@@ -320,15 +313,13 @@ static void consume_one_event(unsigned cpu,
 	if (head == 0)
 		clear_bit(priority, ready);
 
-	if (evtchn_fifo_is_pending(port) && !evtchn_fifo_is_masked(port)) {
-		if (likely(!drop))
-			handle_irq_for_port(port);
-	}
+	if (evtchn_fifo_is_pending(port) && !evtchn_fifo_is_masked(port))
+		handle_irq_for_port(port);
 
 	q->head[priority] = head;
 }
 
-static void __evtchn_fifo_handle_events(unsigned cpu, bool drop)
+static void evtchn_fifo_handle_events(unsigned cpu)
 {
 	struct evtchn_fifo_control_block *control_block;
 	unsigned long ready;
@@ -340,16 +331,11 @@ static void __evtchn_fifo_handle_events(unsigned cpu, bool drop)
 
 	while (ready) {
 		q = find_first_bit(&ready, EVTCHN_FIFO_MAX_QUEUES);
-		consume_one_event(cpu, control_block, q, &ready, drop);
+		consume_one_event(cpu, control_block, q, &ready);
 		ready |= xchg(&control_block->ready, 0);
 	}
 }
 
-static void evtchn_fifo_handle_events(unsigned cpu)
-{
-	__evtchn_fifo_handle_events(cpu, false);
-}
-
 static void evtchn_fifo_resume(void)
 {
 	unsigned cpu;
@@ -385,26 +371,6 @@ static void evtchn_fifo_resume(void)
 	event_array_pages = 0;
 }
 
-static void evtchn_fifo_close(unsigned port, unsigned int cpu)
-{
-	if (cpu == NR_CPUS)
-		return;
-
-	get_online_cpus();
-	if (cpu_online(cpu)) {
-		if (WARN_ON(irqs_disabled()))
-			goto out;
-
-		while (evtchn_fifo_is_linked(port))
-			cpu_relax();
-	} else {
-		__evtchn_fifo_handle_events(cpu, true);
-	}
-
-out:
-	put_online_cpus();
-}
-
 static const struct evtchn_ops evtchn_ops_fifo = {
 	.max_channels      = evtchn_fifo_max_channels,
 	.nr_channels       = evtchn_fifo_nr_channels,
@@ -418,7 +384,6 @@ static const struct evtchn_ops evtchn_ops_fifo = {
 	.unmask            = evtchn_fifo_unmask,
 	.handle_events     = evtchn_fifo_handle_events,
 	.resume            = evtchn_fifo_resume,
-	.close             = evtchn_fifo_close,
 };
 
 static int evtchn_fifo_alloc_control_block(unsigned cpu)