[7/7] PCI: latency timer doesn't apply to PCIe

Commit Message

Myron Stowe Aug. 30, 2011, 4:56 p.m. UTC

From: Myron Stowe <[e-mail]>

The latency timer is read-only and hardwired to zero for all PCIe
devices, both Type 0 and Type 1, so don't bother trying to update it
and cluttering the dmesg log with meaningless "setting latency timer
to 64" messages.

Signed-off-by: Myron Stowe <[e-mail]>
---

 drivers/pci/pci.c |    4 ++++
 1 files changed, 4 insertions(+), 0 deletions(-)


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Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a50e643..a20c01a 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -2607,6 +2607,10 @@  void __weak pcibios_set_master(struct pci_dev *dev)
 {
 	u8 lat;
 
+	/* The latency timer doesn't apply to PCIe (either Type 0 or Type 1) */
+	if (pci_is_pcie(dev))
+		return;
+
 	pci_read_config_byte(dev, PCI_LATENCY_TIMER, &lat);
 	if (lat < 16)
 		lat = (64 <= pcibios_max_latency) ? 64 : pcibios_max_latency;