[PATCH 5.0 49/93] ACPI / utils: Drop reference in test for device presence

From: Greg Kroah-Hartman
Date: Thu Apr 18 2019 - 14:11:21 EST

[ Upstream commit 54e3aca84e571559915998aa6cc05e5ac37c043b ]

When commit 8661423eea1a ("ACPI / utils: Add new acpi_dev_present
helper") introduced acpi_dev_present(), it missed the fact that
bus_find_device() took a reference on the device found by it and
the callers of acpi_dev_present() don't drop that reference.

Drop the reference on the device in acpi_dev_present().

Fixes: 8661423eea1a ("ACPI / utils: Add new acpi_dev_present helper")
Signed-off-by: Andy Shevchenko <andriy.shevchenko@xxxxxxxxxxxxxxx>
Reviewed-by: Hans de Goede <hdegoede@xxxxxxxxxx>
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
drivers/acpi/utils.c | 1 +
1 file changed, 1 insertion(+)

diff --git a/drivers/acpi/utils.c b/drivers/acpi/utils.c
index 78db97687f26..c4b06cc075f9 100644
--- a/drivers/acpi/utils.c
+++ b/drivers/acpi/utils.c
@@ -800,6 +800,7 @@ bool acpi_dev_present(const char *hid, const char *uid, s64 hrv)
match.hrv = hrv;

dev = bus_find_device(&acpi_bus_type, NULL, &match, acpi_dev_match_cb);
+ put_device(dev);
return !!dev;