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* [PATCH 1/1] pci-iov: Fix warnings when CONFIG_PCI_IOV is enabled
@ 2012-09-04 23:11 Jiang Wang
  2012-09-11 23:35 ` Bjorn Helgaas
  0 siblings, 1 reply; 3+ messages in thread
From: Jiang Wang @ 2012-09-04 23:11 UTC (permalink / raw)
  To: Bjorn Helgaas, linux-pci, linux-kernel
  Cc: clala, Francis.St.Amant, Jiang Wang, Jiang Wang

When CONFIG_PCI_IOV is enabled, the kernel will call sriov_init().
This function tries to allocate virtual resources even if the
virtual function of a PCI devive is not enabled by the BIOS.

This sometimes causes following warning messages during boot up:
pci 0000:02:00.0: BAR 9: can't allocate mem resource [0x000000-0x3fffff]
pci 0000:02:00.0: BAR 7: can't allocate mem resource [0x000000-0x03ffff]

Tested on three Mitac motherboards.

Signed-off-by: Jiang Wang <jwang@riverbed.com>
---
 drivers/pci/iov.c |    3 ++-
 1 files changed, 2 insertions(+), 1 deletions(-)

diff --git a/drivers/pci/iov.c b/drivers/pci/iov.c
index 6554e1a..0ca8cb2 100644
--- a/drivers/pci/iov.c
+++ b/drivers/pci/iov.c
@@ -441,7 +441,8 @@ static int sriov_init(struct pci_dev *dev, int pos)
 	if (ctrl & PCI_SRIOV_CTRL_VFE) {
 		pci_write_config_word(dev, pos + PCI_SRIOV_CTRL, 0);
 		ssleep(1);
-	}
+	} else
+		return 0;
 
 	pci_read_config_word(dev, pos + PCI_SRIOV_TOTAL_VF, &total);
 	if (!total)
-- 
1.7.1


^ permalink raw reply related	[flat|nested] 3+ messages in thread

end of thread, other threads:[~2012-09-12  1:13 UTC | newest]

Thread overview: 3+ messages (download: mbox.gz / follow: Atom feed)
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2012-09-04 23:11 [PATCH 1/1] pci-iov: Fix warnings when CONFIG_PCI_IOV is enabled Jiang Wang
2012-09-11 23:35 ` Bjorn Helgaas
2012-09-12  1:13   ` Jiang Wang

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