[PATCH] powernv/pci: Print an error when device enable is blocked

[PATCH] powernv/pci: Print an error when device enable is blocked

[Oliver O'Halloran]

If the platform decides to block enabling the device nothing is printed
currently. This can lead to some confusion since the dmesg output will
usually print an error with no context e.g.

	e1000e: probe of 0022:01:00.0 failed with error -22

This shouldn't be spammy since pci_enable_device() already prints a
messages when it succeeds.

Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
---
 arch/powerpc/platforms/powernv/pci-ioda.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
index cda0933..17fdf46 100644
--- a/arch/powerpc/platforms/powernv/pci-ioda.c
+++ b/arch/powerpc/platforms/powernv/pci-ioda.c
@@ -3296,8 +3296,10 @@ static bool pnv_pci_enable_device_hook(struct pci_dev *dev)
 		return true;
 
 	pdn = pci_get_pdn(dev);
-	if (!pdn || pdn->pe_number == IODA_INVALID_PE)
+	if (!pdn || pdn->pe_number == IODA_INVALID_PE) {
+		pci_err("pci_enable_device() blocked, no PE assigned.\n");
 		return false;
+	}
 
 	return true;
 }
-- 
2.9.5

Re: [PATCH] powernv/pci: Print an error when device enable is blocked

[Oliver O'Halloran]

On Thu, Apr 9, 2020 at 4:13 PM Oliver O'Halloran <oohall@gmail.com> wrote:
>
> If the platform decides to block enabling the device nothing is printed
> currently. This can lead to some confusion since the dmesg output will
> usually print an error with no context e.g.
>
>         e1000e: probe of 0022:01:00.0 failed with error -22
>
> This shouldn't be spammy since pci_enable_device() already prints a
> messages when it succeeds.
>
> Signed-off-by: Oliver O'Halloran <oohall@gmail.com>
> ---
>  arch/powerpc/platforms/powernv/pci-ioda.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
>
> diff --git a/arch/powerpc/platforms/powernv/pci-ioda.c b/arch/powerpc/platforms/powernv/pci-ioda.c
> index cda0933..17fdf46 100644
> --- a/arch/powerpc/platforms/powernv/pci-ioda.c
> +++ b/arch/powerpc/platforms/powernv/pci-ioda.c
> @@ -3296,8 +3296,10 @@ static bool pnv_pci_enable_device_hook(struct pci_dev *dev)
>                 return true;
>
>         pdn = pci_get_pdn(dev);
> -       if (!pdn || pdn->pe_number == IODA_INVALID_PE)
> +       if (!pdn || pdn->pe_number == IODA_INVALID_PE) {
> +               pci_err("pci_enable_device() blocked, no PE assigned.\n");
Maybe I should start compiling my code before I sent it out. Maybe.

>                 return false;
> +       }
>
>         return true;
>  }
> --
> 2.9.5
>

Re: [PATCH] powernv/pci: Print an error when device enable is blocked

[Michael Ellerman]

On Thu, 9 Apr 2020 16:13:37 +1000, Oliver O'Halloran wrote:
> If the platform decides to block enabling the device nothing is printed
> currently. This can lead to some confusion since the dmesg output will
> usually print an error with no context e.g.
> 
> 	e1000e: probe of 0022:01:00.0 failed with error -22
> 
> This shouldn't be spammy since pci_enable_device() already prints a
> messages when it succeeds.

Applied to powerpc/next.

[1/1] powernv/pci: Print an error when device enable is blocked
      https://git.kernel.org/powerpc/c/6c58b1b41b19c00099e4771ee55e21eb9aa245c1

cheers