m68k: Fix WARNING splat in pmac_zilog driver

Don't add platform resources that won't be used. This avoids a
recently-added warning from the driver core, that can show up on a
multi-platform kernel when !MACH_IS_MAC.

------------[ cut here ]------------
WARNING: CPU: 0 PID: 0 at drivers/base/platform.c:224 platform_get_irq_optional+0x8e/0xce
0 is an invalid IRQ number
Modules linked in:
CPU: 0 PID: 0 Comm: swapper Not tainted 5.9.0-multi #1
Stack from 004b3f04:
        004b3f04 00462c2f 00462c2f 004b3f20 0002e128 004754db 004b6ad4 004b3f4c
        0002e19c 004754f7 000000e0 00285ba0 00000009 00000000 004b3f44 ffffffff
        004754db 004b3f64 004b3f74 00285ba0 004754f7 000000e0 00000009 004754db
        004fdf0c 005269e2 004fdf0c 00000000 004b3f88 00285cae 004b6964 00000000
        004fdf0c 004b3fac 0051cc68 004b6964 00000000 004b6964 00000200 00000000
        0051cc3e 0023c18a 004b3fc0 0051cd8a 004fdf0c 00000002 0052b43c 004b3fc8
Call Trace: [<0002e128>] __warn+0xa6/0xd6
 [<0002e19c>] warn_slowpath_fmt+0x44/0x76
 [<00285ba0>] platform_get_irq_optional+0x8e/0xce
 [<00285ba0>] platform_get_irq_optional+0x8e/0xce
 [<00285cae>] platform_get_irq+0x12/0x4c
 [<0051cc68>] pmz_init_port+0x2a/0xa6
 [<0051cc3e>] pmz_init_port+0x0/0xa6
 [<0023c18a>] strlen+0x0/0x22
 [<0051cd8a>] pmz_probe+0x34/0x88
 [<0051cde6>] pmz_console_init+0x8/0x28
 [<00511776>] console_init+0x1e/0x28
 [<0005a3bc>] printk+0x0/0x16
 [<0050a8a6>] start_kernel+0x368/0x4ce
 [<005094f8>] _sinittext+0x4f8/0xc48
random: get_random_bytes called from print_oops_end_marker+0x56/0x80 with crng_init=0
---[ end trace 392d8e82eed68d6c ]---

Commit a85a6c86c25b ("driver core: platform: Clarify that IRQ 0 is invalid"),
which introduced the WARNING, suggests that testing for irq == 0 is
undesirable. Instead of that comparison, just test for resource existence.

Cc: Michael Ellerman <mpe@ellerman.id.au>
Cc: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Cc: Paul Mackerras <paulus@samba.org>
Cc: Joshua Thompson <funaho@jurai.org>
Cc: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: Jiri Slaby <jirislaby@kernel.org>
Cc: stable@vger.kernel.org # v5.8+
Reported-by: Laurent Vivier <laurent@vivier.eu>
Signed-off-by: Finn Thain <fthain@telegraphics.com.au>
Link: https://lore.kernel.org/r/0c0fe1e4f11ccec202d4df09ea7d9d98155d101a.1606001297.git.fthain@telegraphics.com.au
Signed-off-by: Geert Uytterhoeven <geert@linux-m68k.org>

1 files changed, 9 insertions, 5 deletions

diff --git a/drivers/tty/serial/pmac_zilog.c b/drivers/tty/serial/pmac_zilog.c
index 063484b22523..d6aef8a1f0a4 100644
--- a/drivers/tty/serial/pmac_zilog.c
+++ b/drivers/tty/serial/pmac_zilog.c
@@ -1693,22 +1693,26 @@ static int __init pmz_probe(void)
 
 #else
 
+/* On PCI PowerMacs, pmz_probe() does an explicit search of the OpenFirmware
+ * tree to obtain the device_nodes needed to start the console before the
+ * macio driver. On Macs without OpenFirmware, global platform_devices take
+ * the place of those device_nodes.
+ */
 extern struct platform_device scc_a_pdev, scc_b_pdev;
 
 static int __init pmz_init_port(struct uart_pmac_port *uap)
 {
-	struct resource *r_ports;
-	int irq;
+	struct resource *r_ports, *r_irq;
 
 	r_ports = platform_get_resource(uap->pdev, IORESOURCE_MEM, 0);
-	irq = platform_get_irq(uap->pdev, 0);
-	if (!r_ports || irq <= 0)
+	r_irq = platform_get_resource(uap->pdev, IORESOURCE_IRQ, 0);
+	if (!r_ports || !r_irq)
 		return -ENODEV;
 
 	uap->port.mapbase  = r_ports->start;
 	uap->port.membase  = (unsigned char __iomem *) r_ports->start;
 	uap->port.iotype   = UPIO_MEM;
-	uap->port.irq      = irq;
+	uap->port.irq      = r_irq->start;
 	uap->port.uartclk  = ZS_CLOCK;
 	uap->port.fifosize = 1;
 	uap->port.ops      = &pmz_pops;