From: Heikki Krogerus heikki.krogerus@linux.intel.com
commit 1f3546ff3f0a1000971daef58406954bad3f7061 upstream.
Failing probe with -EPROBE_DEFER until all dependencies listed in the _DEP (Operation Region Dependencies) object have been met.
This will fix an issue where on some platforms UCSI ACPI driver fails to probe because the address space handler for the operation region that the UCSI ACPI interface uses has not been loaded yet.
Fixes: 8243edf44152 ("usb: typec: ucsi: Add ACPI driver") Cc: stable@vger.kernel.org Signed-off-by: Heikki Krogerus heikki.krogerus@linux.intel.com Link: https://lore.kernel.org/r/20200904110918.51546-1-heikki.krogerus@linux.intel... Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org
--- drivers/usb/typec/ucsi/ucsi_acpi.c | 4 ++++ 1 file changed, 4 insertions(+)
--- a/drivers/usb/typec/ucsi/ucsi_acpi.c +++ b/drivers/usb/typec/ucsi/ucsi_acpi.c @@ -64,11 +64,15 @@ static void ucsi_acpi_notify(acpi_handle
static int ucsi_acpi_probe(struct platform_device *pdev) { + struct acpi_device *adev = ACPI_COMPANION(&pdev->dev); struct ucsi_acpi *ua; struct resource *res; acpi_status status; int ret;
+ if (adev->dep_unmet) + return -EPROBE_DEFER; + ua = devm_kzalloc(&pdev->dev, sizeof(*ua), GFP_KERNEL); if (!ua) return -ENOMEM;