| Message ID | 20210525230038.GA175516@embeddedor |
|---|---|
| State | New |
| Headers | show |
| Series | [next] i40e: Replace one-element array with flexible-array member | expand |
> Subject: [PATCH][next] i40e: Replace one-element array with flexible-array member > > There is a regular need in the kernel to provide a way to declare having a > dynamically sized set of trailing elements in a structure. Kernel code should always > use “flexible array members”[1] for these cases. The older style of one-element or > zero-length arrays should no longer be used[2]. > > Refactor the code according to the use of a flexible-array member in struct > i40e_qvlist_info instead of one-element array, and use the struct_size() helper. > > [1] https://en.wikipedia.org/wiki/Flexible_array_member > [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length- > and-one-element-arrays > > Link: https://github.com/KSPP/linux/issues/79 > Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> This looks ok to me. Acked-by: Shiraz Saleem <shiraz.saleem@intel.com> It seems we should add this to the new irdma driver submission as well which replaces i40iw. I will fold it into v7 of the rdma portion of the series https://lore.kernel.org/linux-rdma/20210520200326.GX1096940@ziepe.ca/ Additionally we will add this patch when we resend this PR on iwl-next. https://lore.kernel.org/linux-rdma/62555c6de641e10cb4169653731389a51d086345.camel@intel.com/ > --- > drivers/infiniband/hw/i40iw/i40iw_main.c | 5 ++--- > drivers/net/ethernet/intel/i40e/i40e_client.c | 2 +- > include/linux/net/intel/i40e_client.h | 2 +- > 3 files changed, 4 insertions(+), 5 deletions(-) > > diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c > b/drivers/infiniband/hw/i40iw/i40iw_main.c > index b496f30ce066..364f69cd620f 100644 > --- a/drivers/infiniband/hw/i40iw/i40iw_main.c > +++ b/drivers/infiniband/hw/i40iw/i40iw_main.c > @@ -1423,7 +1423,7 @@ static enum i40iw_status_code > i40iw_save_msix_info(struct i40iw_device *iwdev, > struct i40e_qv_info *iw_qvinfo; > u32 ceq_idx; > u32 i; > - u32 size; > + size_t size; > > if (!ldev->msix_count) { > i40iw_pr_err("No MSI-X vectors\n"); > @@ -1433,8 +1433,7 @@ static enum i40iw_status_code > i40iw_save_msix_info(struct i40iw_device *iwdev, > iwdev->msix_count = ldev->msix_count; > > size = sizeof(struct i40iw_msix_vector) * iwdev->msix_count; > - size += sizeof(struct i40e_qvlist_info); > - size += sizeof(struct i40e_qv_info) * iwdev->msix_count - 1; > + size += struct_size(iw_qvlist, qv_info, iwdev->msix_count); > iwdev->iw_msixtbl = kzalloc(size, GFP_KERNEL); > > if (!iwdev->iw_msixtbl) > diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c > b/drivers/net/ethernet/intel/i40e/i40e_client.c > index 32f3facbed1a..63eab14a26df 100644 > --- a/drivers/net/ethernet/intel/i40e/i40e_client.c > +++ b/drivers/net/ethernet/intel/i40e/i40e_client.c > @@ -579,7 +579,7 @@ static int i40e_client_setup_qvlist(struct i40e_info *ldev, > u32 v_idx, i, reg_idx, reg; > > ldev->qvlist_info = kzalloc(struct_size(ldev->qvlist_info, qv_info, > - qvlist_info->num_vectors - 1), GFP_KERNEL); > + qvlist_info->num_vectors), GFP_KERNEL); > if (!ldev->qvlist_info) > return -ENOMEM; > ldev->qvlist_info->num_vectors = qvlist_info->num_vectors; diff --git > a/include/linux/net/intel/i40e_client.h b/include/linux/net/intel/i40e_client.h > index f41387a8969f..fd7bc860a241 100644 > --- a/include/linux/net/intel/i40e_client.h > +++ b/include/linux/net/intel/i40e_client.h > @@ -48,7 +48,7 @@ struct i40e_qv_info { > > struct i40e_qvlist_info { > u32 num_vectors; > - struct i40e_qv_info qv_info[1]; > + struct i40e_qv_info qv_info[]; > }; > > > -- > 2.27.0
diff --git a/drivers/infiniband/hw/i40iw/i40iw_main.c b/drivers/infiniband/hw/i40iw/i40iw_main.c index b496f30ce066..364f69cd620f 100644 --- a/drivers/infiniband/hw/i40iw/i40iw_main.c +++ b/drivers/infiniband/hw/i40iw/i40iw_main.c @@ -1423,7 +1423,7 @@ static enum i40iw_status_code i40iw_save_msix_info(struct i40iw_device *iwdev, struct i40e_qv_info *iw_qvinfo; u32 ceq_idx; u32 i; - u32 size; + size_t size; if (!ldev->msix_count) { i40iw_pr_err("No MSI-X vectors\n"); @@ -1433,8 +1433,7 @@ static enum i40iw_status_code i40iw_save_msix_info(struct i40iw_device *iwdev, iwdev->msix_count = ldev->msix_count; size = sizeof(struct i40iw_msix_vector) * iwdev->msix_count; - size += sizeof(struct i40e_qvlist_info); - size += sizeof(struct i40e_qv_info) * iwdev->msix_count - 1; + size += struct_size(iw_qvlist, qv_info, iwdev->msix_count); iwdev->iw_msixtbl = kzalloc(size, GFP_KERNEL); if (!iwdev->iw_msixtbl) diff --git a/drivers/net/ethernet/intel/i40e/i40e_client.c b/drivers/net/ethernet/intel/i40e/i40e_client.c index 32f3facbed1a..63eab14a26df 100644 --- a/drivers/net/ethernet/intel/i40e/i40e_client.c +++ b/drivers/net/ethernet/intel/i40e/i40e_client.c @@ -579,7 +579,7 @@ static int i40e_client_setup_qvlist(struct i40e_info *ldev, u32 v_idx, i, reg_idx, reg; ldev->qvlist_info = kzalloc(struct_size(ldev->qvlist_info, qv_info, - qvlist_info->num_vectors - 1), GFP_KERNEL); + qvlist_info->num_vectors), GFP_KERNEL); if (!ldev->qvlist_info) return -ENOMEM; ldev->qvlist_info->num_vectors = qvlist_info->num_vectors; diff --git a/include/linux/net/intel/i40e_client.h b/include/linux/net/intel/i40e_client.h index f41387a8969f..fd7bc860a241 100644 --- a/include/linux/net/intel/i40e_client.h +++ b/include/linux/net/intel/i40e_client.h @@ -48,7 +48,7 @@ struct i40e_qv_info { struct i40e_qvlist_info { u32 num_vectors; - struct i40e_qv_info qv_info[1]; + struct i40e_qv_info qv_info[]; };
There is a regular need in the kernel to provide a way to declare having a dynamically sized set of trailing elements in a structure. Kernel code should always use “flexible array members”[1] for these cases. The older style of one-element or zero-length arrays should no longer be used[2]. Refactor the code according to the use of a flexible-array member in struct i40e_qvlist_info instead of one-element array, and use the struct_size() helper. [1] https://en.wikipedia.org/wiki/Flexible_array_member [2] https://www.kernel.org/doc/html/v5.10/process/deprecated.html#zero-length-and-one-element-arrays Link: https://github.com/KSPP/linux/issues/79 Signed-off-by: Gustavo A. R. Silva <gustavoars@kernel.org> --- drivers/infiniband/hw/i40iw/i40iw_main.c | 5 ++--- drivers/net/ethernet/intel/i40e/i40e_client.c | 2 +- include/linux/net/intel/i40e_client.h | 2 +- 3 files changed, 4 insertions(+), 5 deletions(-)