[PATCH 13/23] pcmcia: irq probe can be done without risking an IRQ storm

[Dominik Brodowski]

From: Alan Cox <alan at lxorguk.ukuu.org.uk>

Nowdays you can ask for an IRQ to be allocated but not enabled, when PCMCIA
was written this was not true and this feature is thus not used

[linux at dominikbrodowski.net: add comment and ifdef to avoid compilation
 breakage at least on alpha]
Signed-off-by: Alan Cox <alan at redhat.com>
Signed-off-by: Andrew Morton <akpm at linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux at dominikbrodowski.net>
---
 drivers/pcmcia/pcmcia_resource.c |    9 +++++++++
 1 files changed, 9 insertions(+), 0 deletions(-)

diff --git a/drivers/pcmcia/pcmcia_resource.c b/drivers/pcmcia/pcmcia_resource.c
index c8f77b8..78af594 100644
--- a/drivers/pcmcia/pcmcia_resource.c
+++ b/drivers/pcmcia/pcmcia_resource.c
@@ -812,6 +812,15 @@ int pcmcia_request_irq(struct pcmcia_device *p_dev, irq_req_t *req)
 		type = IRQF_SHARED;
 
 #ifdef CONFIG_PCMCIA_PROBE
+
+#ifdef IRQ_NOAUTOEN
+	/* if the underlying IRQ infrastructure allows for it, only allocate
+	 * the IRQ, but do not enable it
+	 */
+	if (!(req->Attributes & IRQ_HANDLE_PRESENT))
+		type |= IRQ_NOAUTOEN;
+#endif /* IRQ_NOAUTOEN */
+
 	if (s->irq.AssignedIRQ != 0) {
 		/* If the interrupt is already assigned, it must be the same */
 		irq = s->irq.AssignedIRQ;
-- 
1.5.4.3