linux-kernel - [PATCH 1/6] soc: qcom: smem: fix first cache entry calculation

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Message-Id: <20180410222542.29474-2-elder@linaro.org>
Date:   Tue, 10 Apr 2018 17:25:37 -0500
From:   Alex Elder <elder@...aro.org>
To:     andy.gross@...aro.org
Cc:     clew@...eaurora.org, aneela@...eaurora.org, david.brown@...aro.org,
        linux-arm-msm@...r.kernel.org, linux-soc@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [PATCH 1/6] soc: qcom: smem: fix first cache entry calculation

Cached items are found at the high end of an smem partition.  A
cached item's shared memory precedes the private entry structure
that describes it.

The address of the structure describing the first cached item should
be returned by phdr_to_first_cached_entry().  However the function
calculates the start address using the wrong structure size.

Fix this by computing the first item's entry structure address by
subtracting the size of a private entry structure rather than a
partition header structure.

Signed-off-by: Alex Elder <elder@...aro.org>
---
 drivers/soc/qcom/smem.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/soc/qcom/smem.c b/drivers/soc/qcom/smem.c
index 0b94d62fad2b..7f38c5e11440 100644
--- a/drivers/soc/qcom/smem.c
+++ b/drivers/soc/qcom/smem.c
@@ -292,8 +292,9 @@ static void *phdr_to_first_cached_entry(struct smem_partition_header *phdr,
 					size_t cacheline)
 {
 	void *p = phdr;
+	struct smem_private_entry *e;

-	return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*phdr), cacheline);
+	return p + le32_to_cpu(phdr->size) - ALIGN(sizeof(*e), cacheline);
 }

 static void *phdr_to_last_cached_entry(struct smem_partition_header *phdr)
-- 
2.14.1