linux-kernel - [PATCH v2 2/4] ACPI/APMT: Don't register invalid resource

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Date:   Mon,  5 Jun 2023 18:01:32 +0100
From:   Robin Murphy <robin.murphy@....com>
To:     will@...nel.org
Cc:     mark.rutland@....com, suzuki.poulose@....com,
        bwicaksono@...dia.com, ilkka@...amperecomputing.com,
        linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Lorenzo Pieralisi <lpieralisi@...nel.org>,
        Sudeep Holla <sudeep.holla@....com>,
        Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH v2 2/4] ACPI/APMT: Don't register invalid resource

Don't register a resource for the second page unless the dual-page
extension flag is actually present to say it's valid.

CC: Lorenzo Pieralisi <lpieralisi@...nel.org>
CC: Sudeep Holla <sudeep.holla@....com>
Reviewed-by: Suzuki K Poulose <suzuki.poulose@....com>
Reviewed-by: Hanjun Guo <guohanjun@...wei.com>
Reviewed-and-tested-by: Ilkka Koskinen <ilkka@...amperecomputing.com>
Signed-off-by: Robin Murphy <robin.murphy@....com>
---
 drivers/acpi/arm64/apmt.c | 10 ++++++----
 1 file changed, 6 insertions(+), 4 deletions(-)

diff --git a/drivers/acpi/arm64/apmt.c b/drivers/acpi/arm64/apmt.c
index 8cab69fa5d59..aa7d5c3c0dd8 100644
--- a/drivers/acpi/arm64/apmt.c
+++ b/drivers/acpi/arm64/apmt.c
@@ -35,11 +35,13 @@ static int __init apmt_init_resources(struct resource *res,
 
 	num_res++;
 
-	res[num_res].start = node->base_address1;
-	res[num_res].end = node->base_address1 + SZ_4K - 1;
-	res[num_res].flags = IORESOURCE_MEM;
+	if (node->flags & ACPI_APMT_FLAGS_DUAL_PAGE) {
+		res[num_res].start = node->base_address1;
+		res[num_res].end = node->base_address1 + SZ_4K - 1;
+		res[num_res].flags = IORESOURCE_MEM;
 
-	num_res++;
+		num_res++;
+	}
 
 	if (node->ovflw_irq != 0) {
 		trigger = (node->ovflw_irq_flags & ACPI_APMT_OVFLW_IRQ_FLAGS_MODE);
-- 
2.39.2.101.g768bb238c484.dirty