From 6ea8dc661b04ddd5c19163932ee12705c53f552a Mon Sep 17 00:00:00 2001
From: Nam Cao <namcao@linutronix.de>
Date: Thu, 7 Nov 2024 16:01:06 +0100
Subject: fs: Use ARCH_DMA_MINALIGN as default alignment for fs_read_alloc()

The comment above fs_read_alloc() explains:

    @align: Alignment to use for memory allocation (0 for default)

However, in the actual implementation, there is no alignment when @align is
zero.

This current default is probably fine for most cases. But for some block
devices which transfer data via DMA, ARCH_DMA_MINALIGN is needed.

Change the default alignment to ARCH_DMA_MINALIGN.

Fixes: de7b5a8a1ac0 ("fs: Create functions to load and allocate a file")
Signed-off-by: Nam Cao <namcao@linutronix.de>
Tested-by: Javier Fernandez Pastrana <javier.pastrana@linutronix.de>
---
 fs/fs.c | 4 ++++
 1 file changed, 4 insertions(+)

(limited to 'fs')

diff --git a/fs/fs.c b/fs/fs.c
index 1afa0fbeaed..21a23efd932 100644
--- a/fs/fs.c
+++ b/fs/fs.c
@@ -23,6 +23,7 @@
 #include <time.h>
 #include <ubifs_uboot.h>
 #include <btrfs.h>
+#include <asm/cache.h>
 #include <asm/global_data.h>
 #include <asm/io.h>
 #include <div64.h>
@@ -1001,6 +1002,9 @@ int fs_read_alloc(const char *fname, ulong size, uint align, void **bufp)
 	char *buf;
 	int ret;
 
+	if (!align)
+		align = ARCH_DMA_MINALIGN;
+
 	buf = memalign(align, size + 1);
 	if (!buf)
 		return log_msg_ret("buf", -ENOMEM);
-- 
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