When we setup MSI, if device power state is not equal to PCI_D0,
system will silently ignore writing MSI message, but pci_enable_msi()
still return 0 which seems setup successfully. So we should warn here
to help diagnose this issue.
Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
---
drivers/pci/msi.c | 2 ++
1 files changed, 2 insertions(+), 0 deletions(-)
diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c
index aca7578..25ed59d 100644
--- a/drivers/pci/msi.c
+++ b/drivers/pci/msi.c
@@ -291,6 +291,8 @@ void __write_msi_msg(struct msi_desc *entry, struct msi_msg *msg)
{
if (entry->dev->current_state != PCI_D0) {
/* Don't touch the hardware now */
+ dev_warn(&entry->dev->dev,
+ "current_state != PCI_D0, ignore writing MSI message!\n");
} else if (entry->msi_attrib.is_msix) {
void __iomem *base;
base = entry->mask_base +
--
1.7.1
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