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Subject[PATCH] PCI/PM: Set D3 power state only if the end device supports it.
Date
Pci driver doesn't check if the device supports D3hot/D3cold power states 
while setting these power states. The device that doesn't support these
states will fail when a driver like vfio try to do D0->D3 power transition.

This patch adds a check that allows to set D3 power state only
for the supported devices.

Signed-off-by: Geetha sowjanya <gakula@caviumnetworks.com>
---
drivers/pci/pci.c | 3 ++-
1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 563901c..cadd046 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -661,7 +661,8 @@ static int pci_raw_set_power_state(struct pci_dev *dev, pci_power_t state)

/* check if this device supports the desired state */
if ((state == PCI_D1 && !dev->d1_support)
- || (state == PCI_D2 && !dev->d2_support))
+ || (state == PCI_D2 && !dev->d2_support)
+ || (state == PCI_D3hot && !pci_pme_capable(dev, state)))
return -EIO;

pci_read_config_word(dev, dev->pm_cap + PCI_PM_CTRL, &pmcsr);
--
1.7.1
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