linux-kernel - [PATCH net 1/1] net: ipa: pass the correct size when freeing DMA memory

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Message-Id: <20201203215106.17450-1-elder@linaro.org>
Date:   Thu,  3 Dec 2020 15:51:06 -0600
From:   Alex Elder <elder@...aro.org>
To:     davem@...emloft.net, kuba@...nel.org
Cc:     swboyd@...omium.org, sujitka@...omium.org, evgreen@...omium.org,
        cpratapa@...eaurora.org, bjorn.andersson@...aro.org,
        subashab@...eaurora.org, netdev@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH net 1/1] net: ipa: pass the correct size when freeing DMA memory

When the coherent memory is freed in gsi_trans_pool_exit_dma(), we
are mistakenly passing the size of a single element in the pool
rather than the actual allocated size.  Fix this bug.

Fixes: 9dd441e4ed575 ("soc: qcom: ipa: GSI transactions")
Reported-by: Stephen Boyd <swboyd@...omium.org>
Tested-by: Sujit Kautkar <sujitka@...omium.org>
Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/net/ipa/gsi_trans.c | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/drivers/net/ipa/gsi_trans.c b/drivers/net/ipa/gsi_trans.c
index e8599bb948c08..6c3ed5b17b80c 100644
--- a/drivers/net/ipa/gsi_trans.c
+++ b/drivers/net/ipa/gsi_trans.c
@@ -156,6 +156,9 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool,
 	/* The allocator will give us a power-of-2 number of pages.  But we
 	 * can't guarantee that, so request it.  That way we won't waste any
 	 * memory that would be available beyond the required space.
+	 *
+	 * Note that gsi_trans_pool_exit_dma() assumes the total allocated
+	 * size is exactly (count * size).
 	 */
 	total_size = get_order(total_size) << PAGE_SHIFT;
 
@@ -175,7 +178,9 @@ int gsi_trans_pool_init_dma(struct device *dev, struct gsi_trans_pool *pool,
 
 void gsi_trans_pool_exit_dma(struct device *dev, struct gsi_trans_pool *pool)
 {
-	dma_free_coherent(dev, pool->size, pool->base, pool->addr);
+	size_t total_size = pool->count * pool->size;
+
+	dma_free_coherent(dev, total_size, pool->base, pool->addr);
 	memset(pool, 0, sizeof(*pool));
 }
 
-- 
2.20.1