linux-kernel - [PATCH 01/15] habanalabs: fix using freed pointer

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Message-Id: <20221027091007.664797-1-ogabbay@kernel.org>
Date:   Thu, 27 Oct 2022 12:09:53 +0300
From:   Oded Gabbay <ogabbay@...nel.org>
To:     linux-kernel@...r.kernel.org
Cc:     Ohad Sharabi <osharabi@...ana.ai>
Subject: [PATCH 01/15] habanalabs: fix using freed pointer

From: Ohad Sharabi <osharabi@...ana.ai>

The code uses the pointer for trace purpose (without actually
dereference it) but still get static analysis warning.
This patch eliminate the warning.

Signed-off-by: Ohad Sharabi <osharabi@...ana.ai>
Reviewed-by: Oded Gabbay <ogabbay@...nel.org>
Signed-off-by: Oded Gabbay <ogabbay@...nel.org>
---
 drivers/misc/habanalabs/common/device.c | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/drivers/misc/habanalabs/common/device.c b/drivers/misc/habanalabs/common/device.c
index 9b54d1df5302..dd01be5c4ba3 100644
--- a/drivers/misc/habanalabs/common/device.c
+++ b/drivers/misc/habanalabs/common/device.c
@@ -135,6 +135,9 @@ static void hl_asic_dma_free_common(struct hl_device *hdev, size_t size, void *c
 					dma_addr_t dma_handle, enum dma_alloc_type alloc_type,
 					const char *caller)
 {
+	/* this is needed to avoid warning on using freed pointer */
+	u64 store_cpu_addr = (u64) (uintptr_t) cpu_addr;
+
 	switch (alloc_type) {
 	case DMA_ALLOC_COHERENT:
 		hdev->asic_funcs->asic_dma_free_coherent(hdev, size, cpu_addr, dma_handle);
@@ -147,7 +150,7 @@ static void hl_asic_dma_free_common(struct hl_device *hdev, size_t size, void *c
 		break;
 	}
 
-	trace_habanalabs_dma_free(hdev->dev, (u64) (uintptr_t) cpu_addr, dma_handle, size, caller);
+	trace_habanalabs_dma_free(hdev->dev, store_cpu_addr, dma_handle, size, caller);
 }
 
 void *hl_asic_dma_alloc_coherent_caller(struct hl_device *hdev, size_t size, dma_addr_t *dma_handle,
-- 
2.25.1