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sfc: Do not free an empty page_ring

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[ Upstream commit 458f5d92df ]

When the page_ring is not used page_ptr_mask is 0.
Do not dereference page_ring[0] in this case.

Fixes: 2768935a46 ("sfc: reuse pages to avoid DMA mapping/unmapping costs")
Reported-by: Taehee Yoo <ap420073@gmail.com>
Signed-off-by: Martin Habets <habetsm.xilinx@gmail.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Martin Habets 2022-04-04 11:48:51 +01:00 committed by Greg Kroah-Hartman
parent 0ac74169eb
commit d8992b393f
1 changed files with 3 additions and 0 deletions
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3
drivers/net/ethernet/sfc/rx_common.c
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@ -166,6 +166,9 @@ static void efx_fini_rx_recycle_ring(struct efx_rx_queue *rx_queue)
struct efx_nic *efx = rx_queue->efx; struct efx_nic *efx = rx_queue->efx;
int i; int i;
if (unlikely(!rx_queue->page_ring))
return;
/* Unmap and release the pages in the recycle ring. Remove the ring. */ /* Unmap and release the pages in the recycle ring. Remove the ring. */
for (i = 0; i <= rx_queue->page_ptr_mask; i++) { for (i = 0; i <= rx_queue->page_ptr_mask; i++) {
struct page *page = rx_queue->page_ring[i]; struct page *page = rx_queue->page_ring[i];