isa-bus: Remove bogus IRQ sharing check

Nothing prevented IRQ sharing on the ISA bus in principle. Not all
boards supported this, neither each and every card nor driver and OS.
Still, there existed valid IRQ sharing scenarios, (at least) two of them
can also be found in QEMU: >2 PC UARTs and the PREP IDE buses.

So remove this artificial restriction from our ISA model.

Signed-off-by: Jan Kiszka <jan.kiszka@siemens.com>
Signed-off-by: Aurelien Jarno <aurelien@aurel32.net>

1 files changed, 1 insertions, 1 deletions

diff --git a/hw/i8254.c b/hw/i8254.c
index 680caab..eaf5d3e 100644
--- a/hw/i8254.c
+++ b/hw/i8254.c
@@ -514,7 +514,7 @@ static int pit_initfn(ISADevice *dev)
     s = &pit->channels[0];
     /* the timer 0 is connected to an IRQ */
     s->irq_timer = qemu_new_timer(vm_clock, pit_irq_timer, s);
-    s->irq = isa_reserve_irq(pit->irq);
+    s->irq = isa_get_irq(pit->irq);
 
     register_ioport_write(pit->iobase, 4, 1, pit_ioport_write, pit);
     register_ioport_read(pit->iobase, 3, 1, pit_ioport_read, pit);