linux-kernel - [PATCH 1/3] ACPI: OSL: Use deferred unmapping in acpi_os_unmap_generic

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Date:   Thu, 02 Jul 2020 14:11:12 +0200
From:   "Rafael J. Wysocki" <rjw@...ysocki.net>
To:     Linux ACPI <linux-acpi@...r.kernel.org>
Cc:     LKML <linux-kernel@...r.kernel.org>,
        Erik Kaneda <erik.kaneda@...el.com>,
        Bob Moore <robert.moore@...el.com>,
        Len Brown <len.brown@...el.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Dan Williams <dan.j.williams.korg@...il.com>
Subject: [PATCH 1/3] ACPI: OSL: Use deferred unmapping in acpi_os_unmap_generic_address()

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

There is no reason (knwon to me) why any of the existing users of
acpi_os_unmap_generic_address() would need to wait for the unused
memory mappings left by it to actually go away, so use the deferred
unmapping of ACPI memory introduced previously in that function.

Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@...el.com>
---
 drivers/acpi/osl.c | 5 +----
 1 file changed, 1 insertion(+), 4 deletions(-)

diff --git a/drivers/acpi/osl.c b/drivers/acpi/osl.c
index abbf8630f774..5c56f084e8b0 100644
--- a/drivers/acpi/osl.c
+++ b/drivers/acpi/osl.c
@@ -518,12 +518,9 @@ void acpi_os_unmap_generic_address(struct acpi_generic_address *gas)
 		mutex_unlock(&acpi_ioremap_lock);
 		return;
 	}
-	if (acpi_os_drop_map_ref(map, false))
-		map = NULL;
+	acpi_os_drop_map_ref(map, true);
 
 	mutex_unlock(&acpi_ioremap_lock);
-
-	acpi_os_map_cleanup(map);
 }
 EXPORT_SYMBOL(acpi_os_unmap_generic_address);
 
-- 
2.26.2