On Wed, Jun 05, 2019 at 07:14:12PM +0800, Chunyan Zhang wrote:
From: "Strashko, Grygorii" <grygorii.strashko@xxxxxx> [ Upstream commit 013c074f8642d8e815ad670601f8e27155a74b57 ] It is unsafe [1] if probing of devices will happen during suspend or hibernation and system behavior will be unpredictable in this case. So, let's prohibit device's probing in dpm_prepare() and defer their probing instead. The normal behavior will be restored in dpm_complete(). This patch introduces new DD core APIs: device_block_probing() It will disable probing of devices and defer their probes instead. device_unblock_probing() It will restore normal behavior and trigger re-probing of deferred devices. [1] https://lkml.org/lkml/2015/9/11/554 Signed-off-by: Grygorii Strashko <grygorii.strashko@xxxxxx> Acked-by: Pavel Machek <pavel@xxxxxx> Signed-off-by: Rafael J. Wysocki <rafael.j.wysocki@xxxxxxxxx> Signed-off-by: Chunyan Zhang <zhang.chunyan@xxxxxxxxxx>
This patch had to be fixed a few times (see 015bb5e134 and 9a2a5a638f8), we can't just take it as is. It might be just simpler to move to a newer kernel at this point. -- Thanks, Sasha
