linux-kernel - [PATCH v2] ACPI: s2idle: Log when enabling wakeup IRQ fails

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Date:   Mon, 13 Mar 2023 15:47:10 +0100
From:   Simon Gaiser <simon@...isiblethingslab.com>
To:     "Rafael J . Wysocki" <rafael@...nel.org>,
        Len Brown <lenb@...nel.org>
Cc:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        Simon Gaiser <simon@...isiblethingslab.com>
Subject: [PATCH v2] ACPI: s2idle: Log when enabling wakeup IRQ fails

enable_irq_wake() can fail. Previously acpi_s2idle_prepare() silently
ignored it's return code. Based on [1] we should try to continue even in
case of an error, so just log a warning for now.

Discovered when trying to go into s2idle under Xen. This leads to a
system that can't be woken, since xen-pirq currently doesn't support
setting wakeup IRQs [2]. With this you get at least some helpful log
message if you have access to console messages.

Link: https://lore.kernel.org/linux-acpi/20230313125344.2893-1-simon@invisiblethingslab.com/ # v1
Link: https://lore.kernel.org/linux-acpi/CAJZ5v0jahjt58nP6P5+xRdtD_ndYPvq4ecMVz6nfGu9tf5iaUw@mail.gmail.com/ # [1]
Link: https://lore.kernel.org/xen-devel/20230313134102.3157-1-simon@invisiblethingslab.com/ # [2]
Signed-off-by: Simon Gaiser <simon@...isiblethingslab.com>
---
v2:
 - Based on feedback switched to only logging a warning instead of
   returning an error.
---
 drivers/acpi/sleep.c | 8 +++++++-
 1 file changed, 7 insertions(+), 1 deletion(-)

diff --git a/drivers/acpi/sleep.c b/drivers/acpi/sleep.c
index 4ca667251272..6b30dea94fae 100644
--- a/drivers/acpi/sleep.c
+++ b/drivers/acpi/sleep.c
@@ -714,7 +714,13 @@ int acpi_s2idle_begin(void)
 int acpi_s2idle_prepare(void)
 {
 	if (acpi_sci_irq_valid()) {
-		enable_irq_wake(acpi_sci_irq);
+		int error;
+
+		error = enable_irq_wake(acpi_sci_irq);
+		if (error)
+			pr_warn("Warning: Failed to enable wakeup from IRQ %d: %d\n",
+				acpi_sci_irq,
+				error);
 		acpi_ec_set_gpe_wake_mask(ACPI_GPE_ENABLE);
 	}
 
-- 
2.39.2