pcmcia: irq probe can be done without risking an IRQ storm
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@dominikbrodowski.net: add comment and ifdef to avoid compilation
breakage at least on alpha]
Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
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 @@
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;