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ahci: Move interrupt enablement code to a separate function

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This patch refactors ahci_init_interrupts() and moves msi code to a
separate function. Need the split since we add msix initialization in
a later patch. The initialization for msix will be done after msi but
before intx.

Signed-off-by: Robert Richter <rrichter@cavium.com>
Signed-off-by: Tejun Heo <tj@kernel.org>
This commit is contained in:
Robert Richter 2015-05-31 13:55:17 +02:00 committed by Tejun Heo
parent 8485187b5e
commit a1c8231178
1 changed files with 23 additions and 10 deletions
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33
drivers/ata/ahci.c
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@ -1201,17 +1201,17 @@ static inline void ahci_gtf_filter_workaround(struct ata_host *host)
{}
#endif
static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
struct ahci_host_priv *hpriv)
static int ahci_init_msi(struct pci_dev *pdev, unsigned int n_ports,
struct ahci_host_priv *hpriv)
{
int rc, nvec;
if (hpriv->flags & AHCI_HFLAG_NO_MSI)
goto intx;
return -ENODEV;
nvec = pci_msi_vec_count(pdev);
if (nvec < 0)
goto intx;
return nvec;
/*
* If number of MSIs is less than number of ports then Sharing Last
@ -1224,8 +1224,8 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
rc = pci_enable_msi_exact(pdev, nvec);
if (rc == -ENOSPC)
goto single_msi;
else if (rc < 0)
goto intx;
if (rc < 0)
return rc;
/* fallback to single MSI mode if the controller enforced MRSM mode */
if (readl(hpriv->mmio + HOST_CTL) & HOST_MRSM) {
@ -1240,12 +1240,25 @@ static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
return nvec;
single_msi:
if (pci_enable_msi(pdev))
goto intx;
return 1;
rc = pci_enable_msi(pdev);
if (rc < 0)
return rc;
intx:
return 1;
}
static int ahci_init_interrupts(struct pci_dev *pdev, unsigned int n_ports,
struct ahci_host_priv *hpriv)
{
int nvec;
nvec = ahci_init_msi(pdev, n_ports, hpriv);
if (nvec >= 0)
return nvec;
/* lagacy intx interrupts */
pci_intx(pdev, 1);
return 0;
}