linux-kernel - [PATCH 5.6 090/254] ACPI: EC: Avoid printing confusing messages in acpi_ec

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Date:   Thu, 16 Apr 2020 15:22:59 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org,
        "Rafael J. Wysocki" <rafael.j.wysocki@...el.com>
Subject: [PATCH 5.6 090/254] ACPI: EC: Avoid printing confusing messages in acpi_ec_setup()

From: Rafael J. Wysocki <rafael.j.wysocki@...el.com>

commit c823c17a8ea4db4943152388a0beb9a556715716 upstream.

It doesn't really make sense to pass ec->handle of the ECDT EC to
acpi_handle_info(), because it is set to ACPI_ROOT_OBJECT in
acpi_ec_ecdt_probe(), so rework acpi_ec_setup() to avoid using
acpi_handle_info() for printing messages.

First, notice that the "Used as first EC" message is not really
useful, because it is immediately followed by a more meaningful one
from either acpi_ec_ecdt_probe() or acpi_ec_dsdt_probe() (the latter
also includes the EC object path), so drop it altogether.

Second, use pr_info() for printing the EC configuration information.

While at it, make the code in question avoid printing invalid GPE or
IRQ numbers and make it print the GPE/IRQ information only when the
driver is ready to handle events.

Fixes: 72c77b7ea9ce ("ACPI / EC: Cleanup first_ec/boot_ec code")
Fixes: 406857f773b0 ("ACPI: EC: add support for hardware-reduced systems")
Cc: 5.5+ <stable@...r.kernel.org> # 5.5+
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>

---
 drivers/acpi/ec.c |   15 ++++++++++-----
 1 file changed, 10 insertions(+), 5 deletions(-)

--- a/drivers/acpi/ec.c
+++ b/drivers/acpi/ec.c
@@ -1584,14 +1584,19 @@ static int acpi_ec_setup(struct acpi_ec
 		return ret;

 	/* First EC capable of handling transactions */
-	if (!first_ec) {
+	if (!first_ec)
 		first_ec = ec;
-		acpi_handle_info(first_ec->handle, "Used as first EC\n");
+
+	pr_info("EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n", ec->command_addr,
+		ec->data_addr);
+
+	if (test_bit(EC_FLAGS_EVENT_HANDLER_INSTALLED, &ec->flags)) {
+		if (ec->gpe >= 0)
+			pr_info("GPE=0x%x\n", ec->gpe);
+		else
+			pr_info("IRQ=%d\n", ec->irq);
 	}

-	acpi_handle_info(ec->handle,
-			 "GPE=0x%x, IRQ=%d, EC_CMD/EC_SC=0x%lx, EC_DATA=0x%lx\n",
-			 ec->gpe, ec->irq, ec->command_addr, ec->data_addr);
 	return ret;
 }