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

[Alex Elder]

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 <swb...@chromium.org>
Tested-by: Sujit Kautkar <suji...@chromium.org>
Signed-off-by: Alex Elder <el...@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