linux-kernel - [PATCH] sh: use dma_to_phys() instead of dev->dma_pfn

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Date:   Fri, 11 Oct 2019 18:51:29 +0200
From:   Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
To:     linux-kernel@...r.kernel.org
Cc:     hch@...radead.org, Nicolas Saenz Julienne <nsaenzjulienne@...e.de>,
        Yoshinori Sato <ysato@...rs.sourceforge.jp>,
        Rich Felker <dalias@...c.org>, linux-sh@...r.kernel.org
Subject: [PATCH] sh: use dma_to_phys() instead of dev->dma_pfn_offset

It's more explicit and lets dma-direct handle the specifics of how to
translate addresses.

On top of that get rid of warnings as, since the introduction of commit
6fa1d28e38c ("sh: use generic dma_noncoherent_ops"), it's impossible for
the dev to be NULL.

Signed-off-by: Nicolas Saenz Julienne <nsaenzjulienne@...e.de>
---

NOTE: this was only compile tested.

 arch/sh/kernel/dma-coherent.c | 10 +++-------
 1 file changed, 3 insertions(+), 7 deletions(-)

diff --git a/arch/sh/kernel/dma-coherent.c b/arch/sh/kernel/dma-coherent.c
index b17514619b7e..f6618ed01a42 100644
--- a/arch/sh/kernel/dma-coherent.c
+++ b/arch/sh/kernel/dma-coherent.c
@@ -4,6 +4,7 @@
  */
 #include <linux/mm.h>
 #include <linux/init.h>
+#include <linux/dma-direct.h>
 #include <linux/dma-noncoherent.h>
 #include <linux/module.h>
 #include <asm/cacheflush.h>
@@ -36,9 +37,7 @@ void *arch_dma_alloc(struct device *dev, size_t size, dma_addr_t *dma_handle,
 
 	split_page(pfn_to_page(virt_to_phys(ret) >> PAGE_SHIFT), order);
 
-	*dma_handle = virt_to_phys(ret);
-	if (!WARN_ON(!dev))
-		*dma_handle -= PFN_PHYS(dev->dma_pfn_offset);
+	*dma_handle = phys_to_dma(dev, virt_to_phys(ret));
 
 	return ret_nocache;
 }
@@ -47,12 +46,9 @@ void arch_dma_free(struct device *dev, size_t size, void *vaddr,
 		dma_addr_t dma_handle, unsigned long attrs)
 {
 	int order = get_order(size);
-	unsigned long pfn = (dma_handle >> PAGE_SHIFT);
+	unsigned long pfn = __phys_to_pfn(dma_to_phys(dev, dma_handle));
 	int k;
 
-	if (!WARN_ON(!dev))
-		pfn += dev->dma_pfn_offset;
-
 	for (k = 0; k < (1 << order); k++)
 		__free_pages(pfn_to_page(pfn + k), 0);
 
-- 
2.23.0