From:   Johan Hovold <johan+linaro@kernel.org>
To:     Marc Zyngier <maz@kernel.org>, Thomas Gleixner <tglx@linutronix.de>
Cc:     x86@kernel.org, platform-driver-x86@vger.kernel.org,
        linux-arm-kernel@lists.infradead.org, linux-mips@vger.kernel.org,
        linux-kernel@vger.kernel.org,
        Johan Hovold <johan+linaro@kernel.org>, stable@vger.kernel.org,
        Hsin-Yi Wang <hsinyi@chromium.org>,
        Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Subject: [PATCH v6 03/20] irqdomain: Drop bogus fwspec-mapping error handling
Date:   Mon, 13 Feb 2023 11:42:45 +0100
Message-Id: <20230213104302.17307-4-johan+linaro@kernel.org>
In-Reply-To: <20230213104302.17307-1-johan+linaro@kernel.org>
References: <20230213104302.17307-1-johan+linaro@kernel.org>
MIME-Version: 1.0
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In case a newly allocated IRQ ever ends up not having any associated
struct irq_data it would not even be possible to dispose the mapping.

Replace the bogus disposal with a WARN_ON().

This will also be used to fix a shared-interrupt mapping race, hence the
CC-stable tag.

Fixes: 1e2a7d78499e ("irqdomain: Don't set type when mapping an IRQ")
Cc: stable@vger.kernel.org      # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@chromium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Signed-off-by: Johan Hovold <johan+linaro@kernel.org>
---
 kernel/irq/irqdomain.c | 7 +------
 1 file changed, 1 insertion(+), 6 deletions(-)

diff --git a/kernel/irq/irqdomain.c b/kernel/irq/irqdomain.c
index 981cd636275e..b4326c364ae7 100644
--- a/kernel/irq/irqdomain.c
+++ b/kernel/irq/irqdomain.c
@@ -847,13 +847,8 @@ unsigned int irq_create_fwspec_mapping(struct irq_fwspec *fwspec)
 	}
 
 	irq_data = irq_get_irq_data(virq);
-	if (!irq_data) {
-		if (irq_domain_is_hierarchy(domain))
-			irq_domain_free_irqs(virq, 1);
-		else
-			irq_dispose_mapping(virq);
+	if (WARN_ON(!irq_data))
 		return 0;
-	}
 
 	/* Store trigger type */
 	irqd_set_trigger_type(irq_data, type);
-- 
2.39.1