6.6-stable review patch. If anyone has any objections, please let me know.
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From: Shannon Nelson shannon.nelson@amd.com
[ Upstream commit b699bdc720c0255d1bb76cecba7382c1f2107af5 ]
In preparation for adding a new auxiliary_device for the PF, make the vif type an argument to pdsc_auxbus_dev_add(). Pass in the address of the padev pointer so that the caller can specify where to save it and keep the mutex usage within the function.
Link: https://patch.msgid.link/r/20250320194412.67983-3-shannon.nelson@amd.com Reviewed-by: Leon Romanovsky leonro@nvidia.com Reviewed-by: Jonathan Cameron Jonathan.Cameron@huawei.com Reviewed-by: Dave Jiang dave.jiang@intel.com Signed-off-by: Shannon Nelson shannon.nelson@amd.com Signed-off-by: Jason Gunthorpe jgg@nvidia.com Stable-dep-of: dfd76010f8e8 ("pds_core: remove write-after-free of client_id") Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/net/ethernet/amd/pds_core/auxbus.c | 37 ++++++++++----------- drivers/net/ethernet/amd/pds_core/core.h | 7 ++-- drivers/net/ethernet/amd/pds_core/devlink.c | 5 +-- drivers/net/ethernet/amd/pds_core/main.c | 11 +++--- 4 files changed, 33 insertions(+), 27 deletions(-)
diff --git a/drivers/net/ethernet/amd/pds_core/auxbus.c b/drivers/net/ethernet/amd/pds_core/auxbus.c index d53b2124b1498..4d3387bebe6a4 100644 --- a/drivers/net/ethernet/amd/pds_core/auxbus.c +++ b/drivers/net/ethernet/amd/pds_core/auxbus.c @@ -172,29 +172,32 @@ static struct pds_auxiliary_dev *pdsc_auxbus_dev_register(struct pdsc *cf, return padev; }
-void pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf) +void pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf, + struct pds_auxiliary_dev **pd_ptr) { struct pds_auxiliary_dev *padev;
+ if (!*pd_ptr) + return; + mutex_lock(&pf->config_lock);
- padev = pf->vfs[cf->vf_id].padev; - if (padev) { - pds_client_unregister(pf, padev->client_id); - auxiliary_device_delete(&padev->aux_dev); - auxiliary_device_uninit(&padev->aux_dev); - padev->client_id = 0; - } - pf->vfs[cf->vf_id].padev = NULL; + padev = *pd_ptr; + pds_client_unregister(pf, padev->client_id); + auxiliary_device_delete(&padev->aux_dev); + auxiliary_device_uninit(&padev->aux_dev); + padev->client_id = 0; + *pd_ptr = NULL;
mutex_unlock(&pf->config_lock); }
-int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf) +int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf, + enum pds_core_vif_types vt, + struct pds_auxiliary_dev **pd_ptr) { struct pds_auxiliary_dev *padev; char devname[PDS_DEVNAME_LEN]; - enum pds_core_vif_types vt; unsigned long mask; u16 vt_support; int client_id; @@ -203,6 +206,9 @@ int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf) if (!cf) return -ENODEV;
+ if (vt >= PDS_DEV_TYPE_MAX) + return -EINVAL; + mutex_lock(&pf->config_lock);
mask = BIT_ULL(PDSC_S_FW_DEAD) | @@ -214,17 +220,10 @@ int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf) goto out_unlock; }
- /* We only support vDPA so far, so it is the only one to - * be verified that it is available in the Core device and - * enabled in the devlink param. In the future this might - * become a loop for several VIF types. - */ - /* Verify that the type is supported and enabled. It is not * an error if there is no auxbus device support for this * VF, it just means something else needs to happen with it. */ - vt = PDS_DEV_TYPE_VDPA; vt_support = !!le16_to_cpu(pf->dev_ident.vif_types[vt]); if (!(vt_support && pf->viftype_status[vt].supported && @@ -250,7 +249,7 @@ int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf) err = PTR_ERR(padev); goto out_unlock; } - pf->vfs[cf->vf_id].padev = padev; + *pd_ptr = padev;
out_unlock: mutex_unlock(&pf->config_lock); diff --git a/drivers/net/ethernet/amd/pds_core/core.h b/drivers/net/ethernet/amd/pds_core/core.h index 480f9e8cbc4d5..61ee607ee48ac 100644 --- a/drivers/net/ethernet/amd/pds_core/core.h +++ b/drivers/net/ethernet/amd/pds_core/core.h @@ -300,8 +300,11 @@ void pdsc_health_thread(struct work_struct *work); int pdsc_register_notify(struct notifier_block *nb); void pdsc_unregister_notify(struct notifier_block *nb); void pdsc_notify(unsigned long event, void *data); -int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf); -void pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf); +int pdsc_auxbus_dev_add(struct pdsc *cf, struct pdsc *pf, + enum pds_core_vif_types vt, + struct pds_auxiliary_dev **pd_ptr); +void pdsc_auxbus_dev_del(struct pdsc *cf, struct pdsc *pf, + struct pds_auxiliary_dev **pd_ptr);
void pdsc_process_adminq(struct pdsc_qcq *qcq); void pdsc_work_thread(struct work_struct *work); diff --git a/drivers/net/ethernet/amd/pds_core/devlink.c b/drivers/net/ethernet/amd/pds_core/devlink.c index 9b77bb73d25db..bee70e46e34c6 100644 --- a/drivers/net/ethernet/amd/pds_core/devlink.c +++ b/drivers/net/ethernet/amd/pds_core/devlink.c @@ -56,9 +56,10 @@ int pdsc_dl_enable_set(struct devlink *dl, u32 id, struct pdsc *vf = pdsc->vfs[vf_id].vf;
if (ctx->val.vbool) - err = pdsc_auxbus_dev_add(vf, pdsc); + err = pdsc_auxbus_dev_add(vf, pdsc, vt_entry->vif_id, + &pdsc->vfs[vf_id].padev); else - pdsc_auxbus_dev_del(vf, pdsc); + pdsc_auxbus_dev_del(vf, pdsc, &pdsc->vfs[vf_id].padev); }
return err; diff --git a/drivers/net/ethernet/amd/pds_core/main.c b/drivers/net/ethernet/amd/pds_core/main.c index 346a69e95c880..76652e0e5b6d9 100644 --- a/drivers/net/ethernet/amd/pds_core/main.c +++ b/drivers/net/ethernet/amd/pds_core/main.c @@ -189,7 +189,8 @@ static int pdsc_init_vf(struct pdsc *vf) devl_unlock(dl);
pf->vfs[vf->vf_id].vf = vf; - err = pdsc_auxbus_dev_add(vf, pf); + err = pdsc_auxbus_dev_add(vf, pf, PDS_DEV_TYPE_VDPA, + &pf->vfs[vf->vf_id].padev); if (err) { devl_lock(dl); devl_unregister(dl); @@ -415,7 +416,7 @@ static void pdsc_remove(struct pci_dev *pdev)
pf = pdsc_get_pf_struct(pdsc->pdev); if (!IS_ERR(pf)) { - pdsc_auxbus_dev_del(pdsc, pf); + pdsc_auxbus_dev_del(pdsc, pf, &pf->vfs[pdsc->vf_id].padev); pf->vfs[pdsc->vf_id].vf = NULL; } } else { @@ -480,7 +481,8 @@ static void pdsc_reset_prepare(struct pci_dev *pdev)
pf = pdsc_get_pf_struct(pdsc->pdev); if (!IS_ERR(pf)) - pdsc_auxbus_dev_del(pdsc, pf); + pdsc_auxbus_dev_del(pdsc, pf, + &pf->vfs[pdsc->vf_id].padev); }
pdsc_unmap_bars(pdsc); @@ -524,7 +526,8 @@ static void pdsc_reset_done(struct pci_dev *pdev)
pf = pdsc_get_pf_struct(pdsc->pdev); if (!IS_ERR(pf)) - pdsc_auxbus_dev_add(pdsc, pf); + pdsc_auxbus_dev_add(pdsc, pf, PDS_DEV_TYPE_VDPA, + &pf->vfs[pdsc->vf_id].padev); } }