linux-kernel - [PATCH] ARM: OMAP1: ams-delta: Fix impossible .irq

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Date:   Tue,  2 Oct 2018 11:45:29 +0200
From:   Janusz Krzysztofik <jmkrzyszt@...il.com>
To:     Tony Lindgren <tony@...mide.com>
Cc:     Aaro Koskinen <aaro.koskinen@....fi>,
        linux-arm-kernel@...ts.infradead.org,
        Dan Carpenter <dan.carpenter@...cle.com>,
        linux-omap@...r.kernel.org, linux-kernel@...r.kernel.org,
        Janusz Krzysztofik <jmkrzyszt@...il.com>
Subject: [PATCH] ARM: OMAP1: ams-delta: Fix impossible .irq < 0

Since the very beginning, unsigned int .irq member of struct
plat_serial8250_port introduced by commit eff443df679e ("OMAP1:
AMS_DELTA: add modem support") was statically initialized to a negative
value -EINVAL.  Moreover, commit 0812db943748 ("ARM: OMAP1: ams-delta:
assign MODEM IRQ from GPIO descriptor") has introduced some new code
which checks for that member carrying a negative value which is
impossible.

Use IRQ_NOTCONNECTED instead of -EINVAL. Also, drop the valueless check
and let the modem device be registered regardless of .irq value, and
the value handled by "serial8250" driver.

Fixes: 0812db943748 ("ARM: OMAP1: ams-delta: assign MODEM IRQ from GPIO descriptor")
Reported-by: Dan Carpenter <dan.carpenter@...cle.com>
Signed-off-by: Janusz Krzysztofik <jmkrzyszt@...il.com>
---
 arch/arm/mach-omap1/board-ams-delta.c | 8 ++------
 1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/arch/arm/mach-omap1/board-ams-delta.c b/arch/arm/mach-omap1/board-ams-delta.c
index af318d958fd2..3d191fd52910 100644
--- a/arch/arm/mach-omap1/board-ams-delta.c
+++ b/arch/arm/mach-omap1/board-ams-delta.c
@@ -773,7 +773,7 @@ static struct plat_serial8250_port ams_delta_modem_ports[] = {
 	{
 		.membase	= IOMEM(MODEM_VIRT),
 		.mapbase	= MODEM_PHYS,
-		.irq		= -EINVAL, /* changed later */
+		.irq		= IRQ_NOTCONNECTED, /* changed later */
 		.flags		= UPF_BOOT_AUTOCONF,
 		.irqflags	= IRQF_TRIGGER_RISING,
 		.iotype		= UPIO_MEM,
@@ -864,8 +864,7 @@ static int __init modem_nreset_init(void)
 
 
 /*
- * This function expects MODEM IRQ number already assigned to the port
- * and fails if it's not.
+ * This function expects MODEM IRQ number already assigned to the port.
  * The MODEM device requires its RESET# pin kept high during probe.
  * That requirement can be fulfilled in several ways:
  * - with a descriptor of already functional modem_nreset regulator
@@ -888,9 +887,6 @@ static int __init ams_delta_modem_init(void)
 	if (!machine_is_ams_delta())
 		return -ENODEV;
 
-	if (ams_delta_modem_ports[0].irq < 0)
-		return ams_delta_modem_ports[0].irq;
-
 	omap_cfg_reg(M14_1510_GPIO2);
 
 	/* Initialize the modem_nreset regulator consumer before use */
-- 
2.16.4