[PATCH v2] bus/auxiliary: prevent device from being probed again

[David Marchand]

On Wed, Nov 9, 2022 at 3:54 PM Bing Zhao <bingz at nvidia.com> wrote:
>
> The device on auxiliary bus doesn't support being probed again
> without being removed firstly. The PMD will detect and return error
> for this unsupported operation. Some of the resources would be
> cleared wrongly. When quitting, there will be unexpected error like
> crash.
>
> To prevent this, the device driver will be checked before probing a
> device.
>
> Fixes: 1afce3086cf4 ("bus/auxiliary: introduce auxiliary bus")
> CC: stable at dpdk.org
>
> Signed-off-by: Bing Zhao <bingz at nvidia.com>
> Reviewed-by: Gregory Etelson <getelson at nvidia.com>
> Reviewed-by: Matan Azrad <matan at nvidia.com>
> ---
> v2: fix typo
> ---
>  drivers/bus/auxiliary/auxiliary_common.c | 8 ++++++++
>  1 file changed, 8 insertions(+)
>
> diff --git a/drivers/bus/auxiliary/auxiliary_common.c b/drivers/bus/auxiliary/auxiliary_common.c
> index 6bb1fe7c96..8bc9f20f1b 100644
> --- a/drivers/bus/auxiliary/auxiliary_common.c
> +++ b/drivers/bus/auxiliary/auxiliary_common.c
> @@ -89,6 +89,7 @@ rte_auxiliary_probe_one_driver(struct rte_auxiliary_driver *drv,
>  {
>         enum rte_iova_mode iova_mode;
>         int ret;
> +       bool already_probed;
>
>         if (drv == NULL || dev == NULL)
>                 return -EINVAL;
> @@ -116,6 +117,13 @@ rte_auxiliary_probe_one_driver(struct rte_auxiliary_driver *drv,
>                 return -EINVAL;
>         }
>
> +       already_probed = rte_dev_is_probed(&dev->device);
> +       if (already_probed) {

No need for this variable, I removed it when applying.

For consistency with other bus code, I also moved this check before
the IOVA validation.

> +               RTE_LOG(DEBUG, EAL, "Device %s is already probed on auxiliary bus\n",
> +                       dev->device.name);
> +               return -EEXIST;
> +       }
> +
>         /* Allocate interrupt instance */
>         dev->intr_handle =
>                 rte_intr_instance_alloc(RTE_INTR_INSTANCE_F_PRIVATE);
> --
> 2.21.0
>

Applied, thanks.


-- 
David Marchand