pcmcia: rework the irq_req_t typedef

Most of the irq_req_t typedef'd struct can be re-worked quite
easily:

(1) IRQInfo2 was unused in any case, so drop it.

(2) IRQInfo1 was used write-only, so drop it.

(3) Instance (private data to be passed to the IRQ handler):
	Most PCMCIA drivers using pcmcia_request_irq() to actually
	register an IRQ handler set the "dev_id" to the same pointer
	as the "priv" pointer in struct pcmcia_device. Modify the two
	exceptions (ipwireless, ibmtr_cs) to also work this waym and
	set the IRQ handler's "dev_id" to p_dev->priv unconditionally.

(4) Handler is to be of type irq_handler_t.

(5) Handler != NULL already tells whether an IRQ handler is present.
	Therefore, we do not need the IRQ_HANDLER_PRESENT flag in
	irq_req_t.Attributes.

CC: netdev@vger.kernel.org
CC: linux-bluetooth@vger.kernel.org
CC: linux-ide@vger.kernel.org
CC: linux-wireless@vger.kernel.org
CC: linux-scsi@vger.kernel.org
CC: alsa-devel@alsa-project.org
CC: Jaroslav Kysela <perex@perex.cz>
CC: Jiri Kosina <jkosina@suse.cz>
CC: Karsten Keil <isdn@linux-pingi.de>
for the Bluetooth parts: Acked-by: Marcel Holtmann <marcel@holtmann.org>
Signed-off-by: Dominik Brodowski <linux@dominikbrodowski.net>
diff --git a/drivers/char/pcmcia/ipwireless/hardware.c b/drivers/char/pcmcia/ipwireless/hardware.c
index 4c1820c..99cffda 100644
--- a/drivers/char/pcmcia/ipwireless/hardware.c
+++ b/drivers/char/pcmcia/ipwireless/hardware.c
@@ -1213,12 +1213,12 @@
 
 irqreturn_t ipwireless_interrupt(int irq, void *dev_id)
 {
-	struct ipw_hardware *hw = dev_id;
+	struct ipw_dev *ipw = dev_id;
 
-	if (hw->hw_version == HW_VERSION_1)
-		return ipwireless_handle_v1_interrupt(irq, hw);
+	if (ipw->hardware->hw_version == HW_VERSION_1)
+		return ipwireless_handle_v1_interrupt(irq, ipw->hardware);
 	else
-		return ipwireless_handle_v2_v3_interrupt(irq, hw);
+		return ipwireless_handle_v2_v3_interrupt(irq, ipw->hardware);
 }
 
 static void flush_packets_to_hw(struct ipw_hardware *hw)