linux-kernel - [irqchip: irq/irqchip-next] irqdomain: Drop bogus fwspec-mapping error handling

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Message-ID: <167631724697.4906.5044974422442004026.tip-bot2@tip-bot2>
Date:   Mon, 13 Feb 2023 19:40:46 -0000
From:   "irqchip-bot for Johan Hovold" <tip-bot2@...utronix.de>
To:     linux-kernel@...r.kernel.org
Cc:     stable@...r.kernel.org, #@...-bot2.tec.linutronix.de,
        4.8@...-bot2.tec.linutronix.de,
        "Hsin-Yi Wang" <hsinyi@...omium.org>,
        "Mark-PK Tsai" <mark-pk.tsai@...iatek.com>,
        Johan Hovold <johan+linaro@...nel.org>,
        Marc Zyngier <maz@...nel.org>, tglx@...utronix.de
Subject: [irqchip: irq/irqchip-next] irqdomain: Drop bogus fwspec-mapping
 error handling

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

Commit-ID:     e3b7ab025e931accdc2c12acf9b75c6197f1c062
Gitweb:        https://git.kernel.org/pub/scm/linux/kernel/git/maz/arm-platforms/e3b7ab025e931accdc2c12acf9b75c6197f1c062
Author:        Johan Hovold <johan+linaro@...nel.org>
AuthorDate:    Mon, 13 Feb 2023 11:42:45 +01:00
Committer:     Marc Zyngier <maz@...nel.org>
CommitterDate: Mon, 13 Feb 2023 19:31:24 

irqdomain: Drop bogus fwspec-mapping error handling

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@...r.kernel.org      # 4.8
Tested-by: Hsin-Yi Wang <hsinyi@...omium.org>
Tested-by: Mark-PK Tsai <mark-pk.tsai@...iatek.com>
Signed-off-by: Johan Hovold <johan+linaro@...nel.org>
Signed-off-by: Marc Zyngier <maz@...nel.org>
Link: https://lore.kernel.org/r/20230213104302.17307-4-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 f77549a..9f5b96c 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);