Re: [PATCH v5 1/9] ARM/PCI: Replace panic with WARN messages on failures

["Jingoo Han" <jingoohan1@gmail.com>]

On Wednesday, August 05, 2015 6:54 AM, Bjorn Helgaas wrote:
> 
> From: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> 
> In the ARM PCI bios32 layer, failures to dynamically allocate pci_sys_data
> for a PCI bus, or a PCI bus scan failure have to be considered serious
> warnings but they should not trigger a system panic so that at least the
> system is given a chance to be debugged.
> 
> This patch replaces the panic statements with WARN() messages to improve
> error reporting in the ARM PCI bios32 layer.
> 
> Signed-off-by: Lorenzo Pieralisi <lorenzo.pieralisi@arm.com>
> Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
> Acked-by: Marc Zyngier <marc.zyngier@arm.com>
> CC: Russell King <linux@arm.linux.org.uk>
> CC: Marc Zyngier <marc.zyngier@arm.com>

Reviewed-by: Jingoo Han <jingoohan1@gmail.com>

In ARM, WARN message looks good.

Best regards,
Jingoo Han

> ---
>  arch/arm/kernel/bios32.c |   10 ++++++----
>  1 file changed, 6 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/arm/kernel/bios32.c b/arch/arm/kernel/bios32.c
> index bf370bc..4e95260 100644
> --- a/arch/arm/kernel/bios32.c
> +++ b/arch/arm/kernel/bios32.c
> @@ -459,8 +459,8 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
> 
>  	for (nr = busnr = 0; nr < hw->nr_controllers; nr++) {
>  		sys = kzalloc(sizeof(struct pci_sys_data), GFP_KERNEL);
> -		if (!sys)
> -			panic("PCI: unable to allocate sys data!");
> +		if (WARN(!sys, "PCI: unable to allocate sys data!"))
> +			break;
> 
>  #ifdef CONFIG_PCI_MSI
>  		sys->msi_ctrl = hw->msi_ctrl;
> @@ -489,8 +489,10 @@ static void pcibios_init_hw(struct device *parent, struct hw_pci *hw,
>  				sys->bus = pci_scan_root_bus(parent, sys->busnr,
>  						hw->ops, sys, &sys->resources);
> 
> -			if (!sys->bus)
> -				panic("PCI: unable to scan bus!");
> +			if (WARN(!sys->bus, "PCI: unable to scan bus!")) {
> +				kfree(sys);
> +				break;
> +			}
> 
>  			busnr = sys->bus->busn_res.end + 1;
>