linux-kernel - [irqchip: irq/irqchip-next] irqchip/gic-v3: Fix OF_BAD

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Date:   Wed, 07 Apr 2021 12:38:13 -0000
From:   "irqchip-bot for Arnd Bergmann" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     Arnd Bergmann <arnd@...db.de>, Marc Zyngier <maz@...nel.org>,
        tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqchip/gic-v3: Fix OF_BAD_ADDR error handling

The following commit has been merged into the irq/irqchip-next branch of irqchip:

Commit-ID:     8e13d96670a4c050d4883e6743a9e9858e5cfe10
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/8e13d96670a4c050d4883e6743a9e9858e5cfe10
Author:        Arnd Bergmann <arnd@...db.de>
AuthorDate:    Tue, 23 Mar 2021 14:18:35 +01:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Wed, 07 Apr 2021 13:25:52 +01:00

irqchip/gic-v3: Fix OF_BAD_ADDR error handling

When building with extra warnings enabled, clang points out a
mistake in the error handling:

drivers/irqchip/irq-gic-v3-mbi.c:306:21: error: result of comparison of constant 18446744073709551615 with expression of type 'phys_addr_t' (aka 'unsigned int') is always false [-Werror,-Wtautological-constant-out-of-range-compare]
                if (mbi_phys_base == OF_BAD_ADDR) {

Truncate the constant to the same type as the variable it gets compared
to, to shut make the check work and void the warning.

Fixes: 505287525c24 ("irqchip/gic-v3: Add support for Message Based Interrupts as an MSI controller")
Signed-off-by: Arnd Bergmann <arnd@...db.de>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20210323131842.2773094-1-arnd@kernel.org
---
 drivers/irqchip/irq-gic-v3-mbi.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-gic-v3-mbi.c b/drivers/irqchip/irq-gic-v3-mbi.c
index 563a9b3..e81e89a 100644
--- a/drivers/irqchip/irq-gic-v3-mbi.c
+++ b/drivers/irqchip/irq-gic-v3-mbi.c
@@ -303,7 +303,7 @@ int __init mbi_init(struct fwnode_handle *fwnode, struct irq_domain *parent)
 	reg = of_get_property(np, "mbi-alias", NULL);
 	if (reg) {
 		mbi_phys_base = of_translate_address(np, reg);
-		if (mbi_phys_base == OF_BAD_ADDR) {
+		if (mbi_phys_base == (phys_addr_t)OF_BAD_ADDR) {
 			ret = -ENXIO;
 			goto err_free_mbi;
 		}