[for-4.4,11/19] PCI: Ignore BAR updates on virtual functions

Message ID 1490458699-24484-12-git-send-email-sumit.semwal@linaro.org
State New
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Series
  • Stable commits from Ubuntu Yakkety 4.9-lts
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Commit Message

Sumit Semwal March 25, 2017, 4:18 p.m.
From: Bjorn Helgaas <bhelgaas@google.com>


[ Upstream commit 63880b230a4af502c56dde3d4588634c70c66006 ]

VF BARs are read-only zero, so updating VF BARs will not have any effect.
See the SR-IOV spec r1.1, sec 3.4.1.11.

We already ignore these updates because of 70675e0b6a1a ("PCI: Don't try to
restore VF BARs"); this merely restructures it slightly to make it easier
to split updates for standard and SR-IOV BARs.

Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>

Reviewed-by: Gavin Shan <gwshan@linux.vnet.ibm.com>

Signed-off-by: Sasha Levin <alexander.levin@verizon.com>

Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

Signed-off-by: Sumit Semwal <sumit.semwal@linaro.org>

---
 drivers/pci/pci.c       | 4 ----
 drivers/pci/setup-res.c | 5 ++---
 2 files changed, 2 insertions(+), 7 deletions(-)

-- 
2.7.4

Patch

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index a01e6d5..0e53488 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -519,10 +519,6 @@  static void pci_restore_bars(struct pci_dev *dev)
 {
 	int i;
 
-	/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
-	if (dev->is_virtfn)
-		return;
-
 	for (i = 0; i < PCI_BRIDGE_RESOURCES; i++)
 		pci_update_resource(dev, i);
 }
diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 032a6b1..2506296 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -34,10 +34,9 @@  static void pci_std_update_resource(struct pci_dev *dev, int resno)
 	int reg;
 	struct resource *res = dev->resource + resno;
 
-	if (dev->is_virtfn) {
-		dev_warn(&dev->dev, "can't update VF BAR%d\n", resno);
+	/* Per SR-IOV spec 3.4.1.11, VF BARs are RO zero */
+	if (dev->is_virtfn)
 		return;
-	}
 
 	/*
 	 * Ignore resources for unimplemented BARs and unused resource slots