Re: [PATCH 2/4] ACPI/APMT: Don't register invalid resource

From: Ilkka Koskinen
Date: Mon Jun 05 2023 - 03:31:28 EST




On Thu, 1 Jun 2023, Robin Murphy wrote:
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@xxxxxxxxxx>
CC: Hanjun Guo <guohanjun@xxxxxxxxxx>
CC: Sudeep Holla <sudeep.holla@xxxxxxx>
Signed-off-by: Robin Murphy <robin.murphy@xxxxxxx>

Reviewed-and-tested-by: Ilkka Koskinen <ilkka@xxxxxxxxxxxxxxxxxxxxxx>

---

Not a critical fix, since the driver currently works around this itself,
but patch #4 would like to clean that up.

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