[dpdk-stable] [PATCH 19.11] net/mlx5: fix incorrect r/w lock usage in DMA unmap
Christian Ehrhardt
christian.ehrhardt at canonical.com
Wed Aug 11 10:48:07 CEST 2021
On Wed, Aug 11, 2021 at 10:31 AM Feifei Wang <feifei.wang2 at arm.com> wrote:
>
> [ upstream commit 1c196da274b82e6f1642bde7b1c407a2066caee1 ]
>
> For mlx5 DMA unmap, write lock should be used for rebuilding memory
> region cache table rather than read lock.
Thank you, applied to the WIP 19.11 branch
> Fixes: 989e999d9305 ("net/mlx5: support PCI device DMA map and unmap")
> Cc: shahafs at mellanox.com
> Cc: stable at dpdk.org
>
> Signed-off-by: Feifei Wang <feifei.wang2 at arm.com>
> Reviewed-by: Ruifeng Wang <ruifeng.wang at arm.com>
> ---
> drivers/net/mlx5/mlx5_mr.c | 6 +++---
> 1 file changed, 3 insertions(+), 3 deletions(-)
>
> diff --git a/drivers/net/mlx5/mlx5_mr.c b/drivers/net/mlx5/mlx5_mr.c
> index 54a11bd5d1..71c2254c91 100644
> --- a/drivers/net/mlx5/mlx5_mr.c
> +++ b/drivers/net/mlx5/mlx5_mr.c
> @@ -1397,10 +1397,10 @@ mlx5_dma_unmap(struct rte_pci_device *pdev, void *addr,
> }
> priv = dev->data->dev_private;
> sh = priv->sh;
> - rte_rwlock_read_lock(&sh->mr.rwlock);
> + rte_rwlock_write_lock(&sh->mr.rwlock);
> mr = mr_lookup_dev_list(sh, &entry, (uintptr_t)addr);
> if (!mr) {
> - rte_rwlock_read_unlock(&sh->mr.rwlock);
> + rte_rwlock_write_unlock(&sh->mr.rwlock);
> DRV_LOG(WARNING, "address 0x%" PRIxPTR " wasn't registered "
> "to PCI device %p", (uintptr_t)addr,
> (void *)pdev);
> @@ -1424,7 +1424,7 @@ mlx5_dma_unmap(struct rte_pci_device *pdev, void *addr,
> ++sh->mr.dev_gen;
> DEBUG("broadcasting local cache flush, gen=%d", sh->mr.dev_gen);
> rte_smp_wmb();
> - rte_rwlock_read_unlock(&sh->mr.rwlock);
> + rte_rwlock_write_unlock(&sh->mr.rwlock);
> return 0;
> }
>
> --
> 2.25.1
>
--
Christian Ehrhardt
Staff Engineer, Ubuntu Server
Canonical Ltd
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