From 57fbf52c86addd8e25d1975fac0d59d982d1f6ec Mon Sep 17 00:00:00 2001 From: "Michael S. Tsirkin" Date: Thu, 7 May 2009 11:28:41 +0300 Subject: PCI MSI: let drivers retry when not enough vectors pci_enable_msix currently returns -EINVAL if you ask for more vectors than supported by the device, which would typically cause fallback to regular interrupts. It's better to return the table size, making the driver retry MSI-X with less vectors. Reviewed-by: Matthew Wilcox Signed-off-by: Michael S. Tsirkin Signed-off-by: Jesse Barnes --- drivers/pci/msi.c | 6 +++--- 1 file changed, 3 insertions(+), 3 deletions(-) diff --git a/drivers/pci/msi.c b/drivers/pci/msi.c index 7ffac27d5d4..f2725710593 100644 --- a/drivers/pci/msi.c +++ b/drivers/pci/msi.c @@ -691,8 +691,8 @@ int pci_msix_table_size(struct pci_dev *dev) * indicates the successful configuration of MSI-X capability structure * with new allocated MSI-X irqs. A return of < 0 indicates a failure. * Or a return of > 0 indicates that driver request is exceeding the number - * of irqs available. Driver should use the returned value to re-send - * its request. + * of irqs or MSI-X vectors available. Driver should use the returned value to + * re-send its request. **/ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) { @@ -708,7 +708,7 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec) nr_entries = pci_msix_table_size(dev); if (nvec > nr_entries) - return -EINVAL; + return nr_entries; /* Check for any invalid entries */ for (i = 0; i < nvec; i++) { -- cgit v1.2.3-70-g09d2