[PATCH] PCI: For d3_delay and d3cold_delay, zero means zero

[Adrian Hunter <adrian.hunter@intel.com>]

msleep() still sleeps 1 jiffy even when told to sleep for zero
milliseconds. That can end up being 1-2 milliseconds or more. In the cases
of d3_delay and d3cold_delay, that unnecessarily increases suspend and/or
resume latencies.

So, do not sleep at all for the respective cases of d3_delay is zero or
d3cold_delay is zero.

Signed-off-by: Adrian Hunter <adrian.hunter@intel.com>
---
 drivers/pci/pci.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index 7904d02ffdb9..9779483f81fd 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -66,7 +66,8 @@ static void pci_dev_d3_sleep(struct pci_dev *dev)
 	if (delay < pci_pm_d3_delay)
 		delay = pci_pm_d3_delay;
 
-	msleep(delay);
+	if (delay)
+		msleep(delay);
 }
 
 #ifdef CONFIG_PCI_DOMAINS
@@ -827,7 +828,8 @@ static void __pci_start_power_transition(struct pci_dev *dev, pci_power_t state)
 		 * because have already delayed for the bridge.
 		 */
 		if (dev->runtime_d3cold) {
-			msleep(dev->d3cold_delay);
+			if (dev->d3cold_delay)
+				msleep(dev->d3cold_delay);
 			/*
 			 * When powering on a bridge from D3cold, the
 			 * whole hierarchy may be powered on into
-- 
1.9.1