[PATCH] ath11k: fix DMA memory free in CE pipe cleanup

[PATCH] ath11k: fix DMA memory free in CE pipe cleanup

[Karthikeyan Periyasamy]

In CE pipe cleanup, DMA memory gets freed by the aligned address
(base_addr_owner_space) which is wrong. It needs to be freed
by the address (base_addr_owner_space_unaligned) returned by
dma_alloc. So free the dma memory by the proper address.
This was found in code review.

Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.5.0.1-00729-QCAHKSWPL_SILICONZ-3 v2

Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
---
 drivers/net/wireless/ath/ath11k/ce.c | 16 ++++++++++------
 1 file changed, 10 insertions(+), 6 deletions(-)

diff --git a/drivers/net/wireless/ath/ath11k/ce.c b/drivers/net/wireless/ath/ath11k/ce.c
index de8b632..4249c2e 100644
--- a/drivers/net/wireless/ath/ath11k/ce.c
+++ b/drivers/net/wireless/ath/ath11k/ce.c
@@ -953,6 +953,7 @@ int ath11k_ce_init_pipes(struct ath11k_base *ab)
 void ath11k_ce_free_pipes(struct ath11k_base *ab)
 {
 	struct ath11k_ce_pipe *pipe;
+	struct ath11k_ce_ring *ce_ring;
 	int desc_sz;
 	int i;
 
@@ -964,22 +965,24 @@ void ath11k_ce_free_pipes(struct ath11k_base *ab)
 
 		if (pipe->src_ring) {
 			desc_sz = ath11k_hal_ce_get_desc_size(HAL_CE_DESC_SRC);
+			ce_ring = pipe->src_ring;
 			dma_free_coherent(ab->dev,
 					  pipe->src_ring->nentries * desc_sz +
 					  CE_DESC_RING_ALIGN,
-					  pipe->src_ring->base_addr_owner_space,
-					  pipe->src_ring->base_addr_ce_space);
+					  ce_ring->base_addr_owner_space_unaligned,
+					  ce_ring->base_addr_ce_space_unaligned);
 			kfree(pipe->src_ring);
 			pipe->src_ring = NULL;
 		}
 
 		if (pipe->dest_ring) {
 			desc_sz = ath11k_hal_ce_get_desc_size(HAL_CE_DESC_DST);
+			ce_ring = pipe->dest_ring;
 			dma_free_coherent(ab->dev,
 					  pipe->dest_ring->nentries * desc_sz +
 					  CE_DESC_RING_ALIGN,
-					  pipe->dest_ring->base_addr_owner_space,
-					  pipe->dest_ring->base_addr_ce_space);
+					  ce_ring->base_addr_owner_space_unaligned,
+					  ce_ring->base_addr_ce_space_unaligned);
 			kfree(pipe->dest_ring);
 			pipe->dest_ring = NULL;
 		}
@@ -987,11 +990,12 @@ void ath11k_ce_free_pipes(struct ath11k_base *ab)
 		if (pipe->status_ring) {
 			desc_sz =
 			  ath11k_hal_ce_get_desc_size(HAL_CE_DESC_DST_STATUS);
+			ce_ring = pipe->status_ring;
 			dma_free_coherent(ab->dev,
 					  pipe->status_ring->nentries * desc_sz +
 					  CE_DESC_RING_ALIGN,
-					  pipe->status_ring->base_addr_owner_space,
-					  pipe->status_ring->base_addr_ce_space);
+					  ce_ring->base_addr_owner_space_unaligned,
+					  ce_ring->base_addr_ce_space_unaligned);
 			kfree(pipe->status_ring);
 			pipe->status_ring = NULL;
 		}
-- 
2.7.4

Re: [PATCH] ath11k: fix DMA memory free in CE pipe cleanup

[Kalle Valo]

Karthikeyan Periyasamy <quic_periyasa@quicinc.com> wrote:

> In CE pipe cleanup, DMA memory gets freed by the aligned address
> (base_addr_owner_space) which is wrong. It needs to be freed
> by the address (base_addr_owner_space_unaligned) returned by
> dma_alloc. So free the dma memory by the proper address.
> This was found in code review.
> 
> Tested-on: IPQ8074 hw2.0 AHB WLAN.HK.2.5.0.1-00729-QCAHKSWPL_SILICONZ-3 v2
> 
> Signed-off-by: Karthikeyan Periyasamy <quic_periyasa@quicinc.com>
> Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

Patch applied to ath-next branch of ath.git, thanks.

31aeaf547d7e ath11k: fix DMA memory free in CE pipe cleanup

-- 
https://patchwork.kernel.org/project/linux-wireless/patch/1636561290-18966-1-git-send-email-quic_periyasa@quicinc.com/

https://wireless.wiki.kernel.org/en/developers/documentation/submittingpatches