From: Alex Elder <elder@linaro.org>
To: davem@davemloft.net, kuba@kernel.org
Cc: swboyd@chromium.org, sujitka@chromium.org, evgreen@chromium.org,
cpratapa@codeaurora.org, bjorn.andersson@linaro.org,
subashab@codeaurora.org, netdev@vger.kernel.org,
linux-kernel@vger.kernel.org
Subject: [PATCH net 1/1] net: ipa: pass the correct size when freeing DMA memory
Date: Thu, 3 Dec 2020 15:51:06 -0600 [thread overview]
Message-ID: <20201203215106.17450-1-elder@linaro.org> (raw)
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@chromium.org>
Tested-by: Sujit Kautkar <sujitka@chromium.org>
Signed-off-by: Alex Elder <elder@linaro.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
next reply other threads:[~2020-12-03 21:52 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-12-03 21:51 Alex Elder [this message]
2020-12-03 23:28 ` [PATCH net 1/1] net: ipa: pass the correct size when freeing DMA memory Bjorn Andersson
2020-12-04 22:41 ` Jakub Kicinski
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