From 1130b252480f3c98cf468e78c1c5c516b390a29c Mon Sep 17 00:00:00 2001 From: Alex Elder Date: Thu, 3 Dec 2020 15:51:06 -0600 Subject: [PATCH] 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 Tested-by: Sujit Kautkar Signed-off-by: Alex Elder Reviewed-by: Bjorn Andersson Link: https://lore.kernel.org/r/20201203215106.17450-1-elder@linaro.org Signed-off-by: Jakub Kicinski --- 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 e8599bb948c0..6c3ed5b17b80 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)); } -- 2.11.0