[PATCH 6.7 322/713] ACPI: scan: Fix device check notification handling

From: Sasha Levin
Date: Sun Mar 24 2024 - 21:30:45 EST


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

[ Upstream commit 793551c965116d9dfaf0550dacae1396a20efa69 ]

It is generally invalid to fail a Device Check notification if the scan
handler has not been attached to the given device after a bus rescan,
because there may be valid reasons for the scan handler to refuse
attaching to the device (for example, the device is not ready).

For this reason, modify acpi_scan_device_check() to return 0 in that
case without printing a warning.

While at it, reduce the log level of the "already enumerated" message
in the same function, because it is only interesting when debugging
notification handling

Fixes: 443fc8202272 ("ACPI / hotplug: Rework generic code to handle suprise removals")
Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx>
Reviewed-by: Jonathan Cameron <Jonathan.Cameron@xxxxxxxxxx>
Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>
---
drivers/acpi/scan.c | 8 ++------
1 file changed, 2 insertions(+), 6 deletions(-)

diff --git a/drivers/acpi/scan.c b/drivers/acpi/scan.c
index 02bb2cce423f4..35ad5781f0a5e 100644
--- a/drivers/acpi/scan.c
+++ b/drivers/acpi/scan.c
@@ -314,18 +314,14 @@ static int acpi_scan_device_check(struct acpi_device *adev)
* again).
*/
if (adev->handler) {
- dev_warn(&adev->dev, "Already enumerated\n");
- return -EALREADY;
+ dev_dbg(&adev->dev, "Already enumerated\n");
+ return 0;
}
error = acpi_bus_scan(adev->handle);
if (error) {
dev_warn(&adev->dev, "Namespace scan failure\n");
return error;
}
- if (!adev->handler) {
- dev_warn(&adev->dev, "Enumeration failure\n");
- error = -ENODEV;
- }
} else {
error = acpi_scan_device_not_enumerated(adev);
}
--
2.43.0