dma-debug: fix physical address retrieval in debug_dma_sync_sg_for_device

In debug_dma_sync_sg_for_device(), when iterating over a scatterlist,
the debug entry population mistakenly uses the head of the scatterlist
'sg' to fetch the physical address via sg_phys(), instead of using the
current iterator variable 's'.

This causes dma-debug to track the physical address of the very first
scatterlist entry for all subsequent entries in the list.

Fix this by passing the correct loop iterator 's' to sg_phys()

Fixes: 9d4f645a1fd49ee ("dma-debug: store a phys_addr_t in struct dma_debug_entry")
Signed-off-by: Li RongQing <lirongqing@baidu.com>
Signed-off-by: Marek Szyprowski <m.szyprowski@samsung.com>
Link: https://lore.kernel.org/r/20260603123708.1665-1-lirongqing@baidu.com

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 3248f8b4d096ded67cf76a25811129adb363b79f..2c0e2cd89b5ed7453434e27d4d218a334b866cdf 100644 (file)
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -1556,7 +1556,7 @@ void debug_dma_sync_sg_for_device(struct device *dev, struct scatterlist *sg,
                struct dma_debug_entry ref = {
                        .type           = dma_debug_sg,
                        .dev            = dev,
-                       .paddr          = sg_phys(sg),
+                       .paddr          = sg_phys(s),
                        .dev_addr       = sg_dma_address(s),
                        .size           = sg_dma_len(s),
                        .direction      = direction,