Merge tag 'dma-mapping-6.13-2024-11-30' of git://git.infradead.org/users/hch/dma-mapping

Pull dma-mapping fix from Christoph Hellwig:

 - fix physical address calculation for struct dma_debug_entry (Fedor
   Pchelkin)

* tag 'dma-mapping-6.13-2024-11-30' of git://git.infradead.org/users/hch/dma-mapping:
  dma-debug: fix physical address calculation for struct dma_debug_entry

1 files changed, 15 insertions, 5 deletions

diff --git a/kernel/dma/debug.c b/kernel/dma/debug.c
index 295396226f31..e43c6de2bce4 100644
--- a/kernel/dma/debug.c
+++ b/kernel/dma/debug.c
@@ -1219,7 +1219,7 @@ void debug_dma_map_page(struct device *dev, struct page *page, size_t offset,
 
 	entry->dev       = dev;
 	entry->type      = dma_debug_single;
-	entry->paddr	 = page_to_phys(page);
+	entry->paddr	 = page_to_phys(page) + offset;
 	entry->dev_addr  = dma_addr;
 	entry->size      = size;
 	entry->direction = direction;
@@ -1377,6 +1377,18 @@ void debug_dma_unmap_sg(struct device *dev, struct scatterlist *sglist,
 	}
 }
 
+static phys_addr_t virt_to_paddr(void *virt)
+{
+	struct page *page;
+
+	if (is_vmalloc_addr(virt))
+		page = vmalloc_to_page(virt);
+	else
+		page = virt_to_page(virt);
+
+	return page_to_phys(page) + offset_in_page(virt);
+}
+
 void debug_dma_alloc_coherent(struct device *dev, size_t size,
 			      dma_addr_t dma_addr, void *virt,
 			      unsigned long attrs)
@@ -1399,8 +1411,7 @@ void debug_dma_alloc_coherent(struct device *dev, size_t size,
 
 	entry->type      = dma_debug_coherent;
 	entry->dev       = dev;
-	entry->paddr	 = page_to_phys((is_vmalloc_addr(virt) ?
-				vmalloc_to_page(virt) : virt_to_page(virt)));
+	entry->paddr	 = virt_to_paddr(virt);
 	entry->size      = size;
 	entry->dev_addr  = dma_addr;
 	entry->direction = DMA_BIDIRECTIONAL;
@@ -1423,8 +1434,7 @@ void debug_dma_free_coherent(struct device *dev, size_t size,
 	if (!is_vmalloc_addr(virt) && !virt_addr_valid(virt))
 		return;
 
-	ref.paddr = page_to_phys((is_vmalloc_addr(virt) ?
-			vmalloc_to_page(virt) : virt_to_page(virt)));
+	ref.paddr = virt_to_paddr(virt);
 
 	if (unlikely(dma_debug_disabled()))
 		return;