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RDMA/efa: Fix wrong resources deallocation order 

[ Upstream commit dc202c57e9 ]

When trying to destroy QP or CQ, we first decrease the refcount and
potentially free memory regions allocated for the object and then
request the device to destroy the object. If the device fails, the
object isn't fully destroyed so the user/IB core can try to destroy the
object again which will lead to underflow when trying to decrease an
already zeroed refcount.

Deallocate resources in reverse order of allocating them to safely free
them.

Fixes: ff6629f88c ("RDMA/efa: Do not delay freeing of DMA pages")
Reviewed-by: Michael Margolin <mrgolin@amazon.com>
Reviewed-by: Yossi Leybovich <sleybo@amazon.com>
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
Link: https://lore.kernel.org/r/20230822082725.31719-1-ynachum@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Yonatan Nachum 2023-08-22 08:27:25 +00:00 committed by Greg Kroah-Hartman
parent a1ceb3079e
commit e79db2f51a
1 changed files with 3 additions and 3 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

6
drivers/infiniband/hw/efa/efa_verbs.c
View File

@ -449,12 +449,12 @@ int efa_destroy_qp(struct ib_qp *ibqp, struct ib_udata *udata)
ibdev_dbg(&dev->ibdev, "Destroy qp[%u]\n", ibqp->qp_num);
efa_qp_user_mmap_entries_remove(qp);
err = efa_destroy_qp_handle(dev, qp->qp_handle);
if (err)
return err;
efa_qp_user_mmap_entries_remove(qp);
if (qp->rq_cpu_addr) {
ibdev_dbg(&dev->ibdev,
"qp->cpu_addr[0x%p] freed: size[%lu], dma[%pad]\n",
@ -1013,8 +1013,8 @@ int efa_destroy_cq(struct ib_cq *ibcq, struct ib_udata *udata)
"Destroy cq[%d] virt[0x%p] freed: size[%lu], dma[%pad]\n",
cq->cq_idx, cq->cpu_addr, cq->size, &cq->dma_addr);
efa_cq_user_mmap_entries_remove(cq);
efa_destroy_cq_idx(dev, cq->cq_idx);
efa_cq_user_mmap_entries_remove(cq);
if (cq->eq) {
xa_erase(&dev->cqs_xa, cq->cq_idx);
synchronize_irq(cq->eq->irq.irqn);