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MSI: Expand pci_msi_supported() 

pci_enable_msi() and pci_enable_msix() both search for the MSI/MSI-X
capability, we can fold this into pci_msi_supported() by passing the
type in.

Update the code to match the comment for pci_msi_supported(). That is
it returns 0 on success, and anything else indicates an error.

Signed-off-by: Michael Ellerman <michael@ellerman.id.au>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
This commit is contained in:
Michael Ellerman 2007-03-22 21:51:39 +11:00 committed by Greg Kroah-Hartman
parent 3e916c0503
commit b1e2303dba
1 changed files with 8 additions and 11 deletions
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19
drivers/pci/msi.c
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@ -459,12 +459,13 @@ static int msix_capability_init(struct pci_dev *dev,
/**
* pci_msi_supported - check whether MSI may be enabled on device
* @dev: pointer to the pci_dev data structure of MSI device function
* @type: are we checking for MSI or MSI-X ?
*
* Look at global flags, the device itself, and its parent busses
* to return 0 if MSI are supported for the device.
**/
static
int pci_msi_supported(struct pci_dev * dev)
int pci_msi_supported(struct pci_dev * dev, int type)
{
struct pci_bus *bus;
@ -482,6 +483,9 @@ int pci_msi_supported(struct pci_dev * dev)
if (bus->bus_flags & PCI_BUS_FLAGS_NO_MSI)
return -EINVAL;
if (!pci_find_capability(dev, type))
return -EINVAL;
return 0;
}
@ -497,13 +501,9 @@ int pci_msi_supported(struct pci_dev * dev)
**/
int pci_enable_msi(struct pci_dev* dev)
{
int pos, status;
int status;
if (pci_msi_supported(dev) < 0)
return -EINVAL;
pos = pci_find_capability(dev, PCI_CAP_ID_MSI);
if (!pos)
if (pci_msi_supported(dev, PCI_CAP_ID_MSI))
return -EINVAL;
WARN_ON(!!dev->msi_enabled);
@ -606,13 +606,10 @@ int pci_enable_msix(struct pci_dev* dev, struct msix_entry *entries, int nvec)
int i, j;
u16 control;
if (!entries || pci_msi_supported(dev) < 0)
if (!entries || pci_msi_supported(dev, PCI_CAP_ID_MSIX))
return -EINVAL;
pos = pci_find_capability(dev, PCI_CAP_ID_MSIX);
if (!pos)
return -EINVAL;
pci_read_config_word(dev, msi_control_reg(pos), &control);
nr_entries = multi_msix_capable(control);
if (nvec > nr_entries)