Commit
This commit does not belong to any branch on this repository, and may belong to a fork outside of the repository.
PCI/PM: Keep parent bridge active when probing device
This patch fixes the following bug: http://marc.info/?l=linux-pci&m=134329923124234&w=2 The root cause of the bug is as follow. If a device is not bound with the corresponding driver, the device runtime PM will be disabled and the device will be put into suspended state. So that, the bridge/PCIe port connected to it may be put into suspended and low power state. When do probing for the device later, because the bridge/PCIe port connected to it is in low power state, the IO access to device may fail. To solve the issue, the bridge/PCIe port connected to the device is put into active state before probing. Reported-by: Bjorn Mork <[email protected]> Signed-off-by: Huang Ying <[email protected]> Signed-off-by: Bjorn Helgaas <[email protected]> Reviewed-by: Rafael J. Wysocki <[email protected]>
- Loading branch information