Re: [PATCH v2 05/18] pnv_phb4.c: check if root port exists in rc_config functions

["Cédric Le Goater" <clg@kaod.org>]

On 1/5/22 22:23, Daniel Henrique Barboza wrote:
> pnv_phb4_rc_config_read() and pnv_phb4_rc_config_write() are asserting
> the existence of the root port. The root port is now optional, and there
> will be cases where a pnv-phb4 device won't have a root port attached.
> 
> Instead of asserting, check if the root port exists before read/writing
> into it.
> 
> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com>


Reviewed-by: Cédric Le Goater <clg@kaod.org>

Thanks,

C.

> ---
>   hw/pci-host/pnv_phb4.c | 10 ++++++++--
>   1 file changed, 8 insertions(+), 2 deletions(-)
> 
> diff --git a/hw/pci-host/pnv_phb4.c b/hw/pci-host/pnv_phb4.c
> index 14827f8464..83dedc878a 100644
> --- a/hw/pci-host/pnv_phb4.c
> +++ b/hw/pci-host/pnv_phb4.c
> @@ -152,7 +152,10 @@ static void pnv_phb4_rc_config_write(PnvPHB4 *phb, unsigned off,
>       }
>   
>       pdev = pci_find_device(pci->bus, 0, 0);
> -    assert(pdev);
> +    if (!pdev) {
> +        phb_error(phb, "rc_config_write device not found\n");
> +        return;
> +    }
>   
>       pci_host_config_write_common(pdev, off, PHB_RC_CONFIG_SIZE,
>                                    bswap32(val), 4);
> @@ -171,7 +174,10 @@ static uint64_t pnv_phb4_rc_config_read(PnvPHB4 *phb, unsigned off,
>       }
>   
>       pdev = pci_find_device(pci->bus, 0, 0);
> -    assert(pdev);
> +    if (!pdev) {
> +        phb_error(phb, "rc_config_read device not found\n");
> +        return ~0ull;
> +    }
>   
>       val = pci_host_config_read_common(pdev, off, PHB_RC_CONFIG_SIZE, 4);
>       return bswap32(val);
>