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SubjectRe: [patch 01/39] PCI/MSI: Check for MSI enabled in __pci_msix_enable()
On Fri, Nov 11, 2022 at 02:54:15PM +0100, Thomas Gleixner wrote:
> PCI/MSI and PCI/MSI-X are mutually exclusive, but the MSI-X enable code
> lacks a check for already enabled MSI.
>
> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
> ---
> drivers/pci/msi/msi.c | 5 +++++
> 1 file changed, 5 insertions(+)
>
> --- a/drivers/pci/msi/msi.c
> +++ b/drivers/pci/msi/msi.c
> @@ -935,6 +935,11 @@ static int __pci_enable_msix_range(struc
> if (maxvec < minvec)
> return -ERANGE;
>
> + if (dev->msi_enabled) {
> + pci_info(dev, "can't enable MSI-X (MSI already enabled)\n");
> + return -EINVAL;
> + }
> +

nit:

Can the pre-enabled checks for msi and msix be moved up before any vector
range check?

not that it matters for how it fails, does EBUSY sound better?

looks good.

Reviewed-by: Ashok Raj <ashok.raj@intel.com>

> if (WARN_ON_ONCE(dev->msix_enabled))
> return -EINVAL;

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