On Wed, Jun 05, 2019 at 07:14:12PM +0800, Chunyan Zhang wrote:
From: "Strashko, Grygorii" grygorii.strashko@ti.com
[ 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@ti.com Acked-by: Pavel Machek pavel@ucw.cz Signed-off-by: Rafael J. Wysocki rafael.j.wysocki@intel.com Signed-off-by: Chunyan Zhang zhang.chunyan@linaro.org
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