| Message ID | 20240503100440.6066-1-leitao@debian.org (mailing list archive) |
|---|---|
| State | Superseded |
| Delegated to: | Netdev Maintainers |
| Headers | show |
| Series | [wireless-next] wifi: ath12k: allocate dummy net_device dynamically | expand |
| Context | Check | Description |
|---|---|---|
| netdev/tree_selection | success | Not a local patch |
On Fri, May 03, 2024 at 03:04:39AM -0700, Breno Leitao wrote: > Embedding net_device into structures prohibits the usage of flexible > arrays in the net_device structure. For more details, see the discussion > at [1]. > > Un-embed the net_device from struct ath12k_ext_irq_grp by converting it > into a pointer. Then use the leverage alloc_netdev_dummy() to allocate > the net_device object at ath12k_pci_ext_irq_config(). > > The free of the device occurs at ath12k_pci_free_ext_irq(). > > [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ > > This is *very* similar to the same changes in ath11k commit > bca592ead82528b ("wifi: ath11k: allocate dummy net_device dynamically") > > Signed-off-by: Breno Leitao <leitao@debian.org> ... > diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c ... > @@ -577,8 +578,11 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) > > irq_grp->ab = ab; > irq_grp->grp_id = i; > - init_dummy_netdev(&irq_grp->napi_ndev); > - netif_napi_add(&irq_grp->napi_ndev, &irq_grp->napi, > + irq_grp->napi_ndev = alloc_netdev_dummy(0); > + if (!irq_grp->napi_ndev) > + return -ENOMEM; Hi Breno, Will returning on error here leak resources allocated by alloc_netdev_dummy() in previous iterations of this loop? If so, I suggest jumping to unwind handling which can be shared with the error path in the hunk below. > + > + netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi, > ath12k_pci_ext_grp_napi_poll); > > if (ab->hw_params->ring_mask->tx[i] || > @@ -611,6 +615,10 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) > if (ret) { > ath12k_err(ab, "failed request irq %d: %d\n", > vector, ret); > + for (n = 0; n <= i; n++) { > + irq_grp = &ab->ext_irq_grp[n]; > + free_netdev(irq_grp->napi_ndev); > + } > return ret; > } > }
On Sat, May 04, 2024 at 03:55:23PM +0100, Simon Horman wrote: > On Fri, May 03, 2024 at 03:04:39AM -0700, Breno Leitao wrote: > > Embedding net_device into structures prohibits the usage of flexible > > arrays in the net_device structure. For more details, see the discussion > > at [1]. > > > > Un-embed the net_device from struct ath12k_ext_irq_grp by converting it > > into a pointer. Then use the leverage alloc_netdev_dummy() to allocate > > the net_device object at ath12k_pci_ext_irq_config(). > > > > The free of the device occurs at ath12k_pci_free_ext_irq(). > > > > [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ > > > > This is *very* similar to the same changes in ath11k commit > > bca592ead82528b ("wifi: ath11k: allocate dummy net_device dynamically") > > > > Signed-off-by: Breno Leitao <leitao@debian.org> > > ... > > > diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c > > ... > > > @@ -577,8 +578,11 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) > > > > irq_grp->ab = ab; > > irq_grp->grp_id = i; > > - init_dummy_netdev(&irq_grp->napi_ndev); > > - netif_napi_add(&irq_grp->napi_ndev, &irq_grp->napi, > > + irq_grp->napi_ndev = alloc_netdev_dummy(0); > > + if (!irq_grp->napi_ndev) > > + return -ENOMEM; > > Hi Breno, > > Will returning on error here leak resources allocated by > alloc_netdev_dummy() in previous iterations of this loop? very good catch. Thanks! > If so, I suggest jumping to unwind handling which > can be shared with the error path in the hunk below. Agree. let me spend some time and propose a V2. Thanks
diff --git a/drivers/net/wireless/ath/ath12k/core.h b/drivers/net/wireless/ath/ath12k/core.h index 97e5a0ccd233..71c67f47d0ad 100644 --- a/drivers/net/wireless/ath/ath12k/core.h +++ b/drivers/net/wireless/ath/ath12k/core.h @@ -144,7 +144,7 @@ struct ath12k_ext_irq_grp { u32 grp_id; u64 timestamp; struct napi_struct napi; - struct net_device napi_ndev; + struct net_device *napi_ndev; }; struct ath12k_smbios_bdf { diff --git a/drivers/net/wireless/ath/ath12k/pci.c b/drivers/net/wireless/ath/ath12k/pci.c index 14954bc05144..322f0ad1b12d 100644 --- a/drivers/net/wireless/ath/ath12k/pci.c +++ b/drivers/net/wireless/ath/ath12k/pci.c @@ -350,6 +350,7 @@ static void ath12k_pci_free_ext_irq(struct ath12k_base *ab) free_irq(ab->irq_num[irq_grp->irqs[j]], irq_grp); netif_napi_del(&irq_grp->napi); + free_netdev(irq_grp->napi_ndev); } } @@ -560,7 +561,7 @@ static irqreturn_t ath12k_pci_ext_interrupt_handler(int irq, void *arg) static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) { struct ath12k_pci *ab_pci = ath12k_pci_priv(ab); - int i, j, ret, num_vectors = 0; + int i, j, n, ret, num_vectors = 0; u32 user_base_data = 0, base_vector = 0, base_idx; base_idx = ATH12K_PCI_IRQ_CE0_OFFSET + CE_COUNT_MAX; @@ -577,8 +578,11 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) irq_grp->ab = ab; irq_grp->grp_id = i; - init_dummy_netdev(&irq_grp->napi_ndev); - netif_napi_add(&irq_grp->napi_ndev, &irq_grp->napi, + irq_grp->napi_ndev = alloc_netdev_dummy(0); + if (!irq_grp->napi_ndev) + return -ENOMEM; + + netif_napi_add(irq_grp->napi_ndev, &irq_grp->napi, ath12k_pci_ext_grp_napi_poll); if (ab->hw_params->ring_mask->tx[i] || @@ -611,6 +615,10 @@ static int ath12k_pci_ext_irq_config(struct ath12k_base *ab) if (ret) { ath12k_err(ab, "failed request irq %d: %d\n", vector, ret); + for (n = 0; n <= i; n++) { + irq_grp = &ab->ext_irq_grp[n]; + free_netdev(irq_grp->napi_ndev); + } return ret; } }
Embedding net_device into structures prohibits the usage of flexible arrays in the net_device structure. For more details, see the discussion at [1]. Un-embed the net_device from struct ath12k_ext_irq_grp by converting it into a pointer. Then use the leverage alloc_netdev_dummy() to allocate the net_device object at ath12k_pci_ext_irq_config(). The free of the device occurs at ath12k_pci_free_ext_irq(). [1] https://lore.kernel.org/all/20240229225910.79e224cf@kernel.org/ This is *very* similar to the same changes in ath11k commit bca592ead82528b ("wifi: ath11k: allocate dummy net_device dynamically") Signed-off-by: Breno Leitao <leitao@debian.org> --- drivers/net/wireless/ath/ath12k/core.h | 2 +- drivers/net/wireless/ath/ath12k/pci.c | 14 +++++++++++--- 2 files changed, 12 insertions(+), 4 deletions(-)