linux-kernel - [tip: irq/core] irqchip/riscv-aplic: Prevent crash when MSI domain is missing

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Message-ID: <173171464193.412.13982264589277396499.tip-bot2@tip-bot2>
Date: Fri, 15 Nov 2024 23:50:41 -0000
From: "tip-bot2 for Samuel Holland" <tip-bot2@...utronix.de>
To: linux-tip-commits@...r.kernel.org
Cc: Samuel Holland <samuel.holland@...ive.com>,
 Thomas Gleixner <tglx@...utronix.de>, x86@...nel.org,
 linux-kernel@...r.kernel.org, maz@...nel.org
Subject:
 [tip: irq/core] irqchip/riscv-aplic: Prevent crash when MSI domain is missing

The following commit has been merged into the irq/core branch of tip:

Commit-ID:     1f181d1cda56c2fbe379c5ace1aa1fac6306669e
Gitweb:        https://git.kernel.org/tip/1f181d1cda56c2fbe379c5ace1aa1fac6306669e
Author:        Samuel Holland <samuel.holland@...ive.com>
AuthorDate:    Thu, 14 Nov 2024 12:01:30 -08:00
Committer:     Thomas Gleixner <tglx@...utronix.de>
CommitterDate: Sat, 16 Nov 2024 00:45:37 +01:00

irqchip/riscv-aplic: Prevent crash when MSI domain is missing

If the APLIC driver is probed before the IMSIC driver, the parent MSI
domain will be missing, which causes a NULL pointer dereference in
msi_create_device_irq_domain().

Avoid this by deferring probe until the parent MSI domain is available. Use
dev_err_probe() to avoid printing an error message when returning
-EPROBE_DEFER.

Fixes: ca8df97fe679 ("irqchip/riscv-aplic: Add support for MSI-mode")
Signed-off-by: Samuel Holland <samuel.holland@...ive.com>
Signed-off-by: Thomas Gleixner <tglx@...utronix.de>
Link: https://lore.kernel.org/all/20241114200133.3069460-1-samuel.holland@sifive.com

---
 drivers/irqchip/irq-riscv-aplic-main.c | 3 ++-
 drivers/irqchip/irq-riscv-aplic-msi.c  | 3 +++
 2 files changed, 5 insertions(+), 1 deletion(-)

diff --git a/drivers/irqchip/irq-riscv-aplic-main.c b/drivers/irqchip/irq-riscv-aplic-main.c
index 900e725..93e7c51 100644
--- a/drivers/irqchip/irq-riscv-aplic-main.c
+++ b/drivers/irqchip/irq-riscv-aplic-main.c
@@ -207,7 +207,8 @@ static int aplic_probe(struct platform_device *pdev)
 	else
 		rc = aplic_direct_setup(dev, regs);
 	if (rc)
-		dev_err(dev, "failed to setup APLIC in %s mode\n", msi_mode ? "MSI" : "direct");
+		dev_err_probe(dev, rc, "failed to setup APLIC in %s mode\n",
+			      msi_mode ? "MSI" : "direct");
 
 #ifdef CONFIG_ACPI
 	if (!acpi_disabled)
diff --git a/drivers/irqchip/irq-riscv-aplic-msi.c b/drivers/irqchip/irq-riscv-aplic-msi.c
index 945bff2..fb8d183 100644
--- a/drivers/irqchip/irq-riscv-aplic-msi.c
+++ b/drivers/irqchip/irq-riscv-aplic-msi.c
@@ -266,6 +266,9 @@ int aplic_msi_setup(struct device *dev, void __iomem *regs)
 			if (msi_domain)
 				dev_set_msi_domain(dev, msi_domain);
 		}
+
+		if (!dev_get_msi_domain(dev))
+			return -EPROBE_DEFER;
 	}
 
 	if (!msi_create_device_irq_domain(dev, MSI_DEFAULT_DOMAIN, &aplic_msi_template,