On Thu, 12 Jan 2023 12:29:32 -0800 Ajit Khaparde wrote:
> Add auxiliary driver support.
> An auxiliary device will be created if the hardware indicates
> support for RDMA.
> The bnxt_ulp_probe() function has been removed and a new
> bnxt_rdma_aux_device_add() function has been added.
> The bnxt_free_msix_vecs() and bnxt_req_msix_vecs() will now hold
> the RTNL lock when they call the bnxt_close_nic()and bnxt_open_nic()
> since the device close and open need to be protected under RTNL lock.
> The operations between the bnxt_en and bnxt_re will be protected
> using the en_ops_lock.
> This will be used by the bnxt_re driver in a follow-on patch
> to create ROCE interfaces.
> --- a/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> +++ b/drivers/net/ethernet/broadcom/bnxt/bnxt.c
> @@ -13178,6 +13178,9 @@ static void bnxt_remove_one(struct pci_dev *pdev)
> struct net_device *dev = pci_get_drvdata(pdev);
> struct bnxt *bp = netdev_priv(dev);
>
> + bnxt_rdma_aux_device_uninit(bp);
> + bnxt_aux_dev_free(bp);
You still free bp->aux_dev synchronously..
> +void bnxt_aux_dev_free(struct bnxt *bp)
> +{
> + kfree(bp->aux_dev);
.. here. Which is called on .remove of the PCI device.
> + bp->aux_dev = NULL;
> +}
> +
> +static struct bnxt_aux_dev *bnxt_aux_dev_alloc(struct bnxt *bp)
> +{
> + return kzalloc(sizeof(struct bnxt_aux_dev), GFP_KERNEL);
> +}
> +
> +void bnxt_rdma_aux_device_uninit(struct bnxt *bp)
> +{
> + struct bnxt_aux_dev *bnxt_adev;
> + struct auxiliary_device *adev;
> +
> + /* Skip if no auxiliary device init was done. */
> + if (!(bp->flags & BNXT_FLAG_ROCE_CAP))
> + return;
> +
> + bnxt_adev = bp->aux_dev;
> + adev = &bnxt_adev->aux_dev;
> + auxiliary_device_delete(adev);
> + auxiliary_device_uninit(adev);
> + if (bnxt_adev->id >= 0)
> + ida_free(&bnxt_aux_dev_ids, bnxt_adev->id);
> +}
> +
> +static void bnxt_aux_dev_release(struct device *dev)
> +{
> + struct bnxt_aux_dev *bnxt_adev =
> + container_of(dev, struct bnxt_aux_dev, aux_dev.dev);
> + struct bnxt *bp = netdev_priv(bnxt_adev->edev->net);
> +
> + bnxt_adev->edev->en_ops = NULL;
> + kfree(bnxt_adev->edev);
And yet the reference counted "release" function accesses the bp->adev
like it must exist.
This seems odd to me - why do we need refcounting on devices at all
if we can free them synchronously? To be clear - I'm not sure this is
wrong, just seems odd.
> + bnxt_adev->edev = NULL;
> + bp->edev = NULL;
> +}
