diff options
| author | Huang Ying | 2012-08-08 03:07:39 +0200 |
|---|---|---|
| committer | Bjorn Helgaas | 2012-08-22 01:32:07 +0200 |
| commit | ea8c88f13d9fb1d6b39a05bfa07ae076ca1c6803 (patch) | |
| tree | b063ab2cc5c779bf5f9ba7d92514dbfb04d64360 /drivers/pci/pci-sysfs.c | |
| parent | PCI/PM: Enable D3/D3cold by default for most devices (diff) | |
| download | kernel-qcow2-linux-ea8c88f13d9fb1d6b39a05bfa07ae076ca1c6803.tar.gz kernel-qcow2-linux-ea8c88f13d9fb1d6b39a05bfa07ae076ca1c6803.tar.xz kernel-qcow2-linux-ea8c88f13d9fb1d6b39a05bfa07ae076ca1c6803.zip | |
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 <bjorn@mork.no>
Signed-off-by: Huang Ying <ying.huang@intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Reviewed-by: Rafael J. Wysocki <rjw@sisk.pl>
Diffstat (limited to 'drivers/pci/pci-sysfs.c')
0 files changed, 0 insertions, 0 deletions