[U-Boot] [PATCH] fat: Use cache aligned buffers for fat_opendir

[Lukasz Majewski]

On Fri, 24 Nov 2017 09:54:41 +0100
Neil Armstrong <narmstrong at baylibre.com> wrote:

> Before this patch one could receive following errors when executing
> "fatls" command on machine with cache enabled (ex i.MX6Q) :
> 
> => fatls mmc 0:1  
> CACHE: Misaligned operation at range [4f59dfc8, 4f59e7c8]
> CACHE: Misaligned operation at range [4f59dfc8, 4f59e7c8]
> ERROR: v7_outer_cache_inval_range - start address is not aligned -
> 0x4f59dfc8 ERROR: v7_outer_cache_inval_range - stop address is not
> aligned - 0x4f59e7c8 CACHE: Misaligned operation at range [4f59dfc8,
> 4f59e7c8] CACHE: Misaligned operation at range [4f59dfc8, 4f59e7c8]
> ERROR: v7_outer_cache_inval_range - start address is not aligned -
> 0x4f59dfc8 ERROR: v7_outer_cache_inval_range - stop address is not
> aligned - 0x4f59e7c8
> 
> To alleviate this problem - the calloc()s have been replaced with
> malloc_cache_aligned() and memset().
> 
> After those changes the buffers are properly aligned (with both start
> address and size) to SoC cache line.
> 
> Fixes: 09fa964bba80 ("fs/fat: Fix 'CACHE: Misaligned operation at
> range' warnings") Suggested-by: Lukasz Majewski <lukma at denx.de>
> Signed-off-by: Neil Armstrong <narmstrong at baylibre.com>
> ---
>  fs/fat/fat.c | 4 +++-
>  1 file changed, 3 insertions(+), 1 deletion(-)
> 
> diff --git a/fs/fat/fat.c b/fs/fat/fat.c
> index 7fe7843..d16883f 100644
> --- a/fs/fat/fat.c
> +++ b/fs/fat/fat.c
> @@ -1149,11 +1149,13 @@ typedef struct {
>  
>  int fat_opendir(const char *filename, struct fs_dir_stream **dirsp)
>  {
> -	fat_dir *dir = calloc(1, sizeof(*dir));
> +	fat_dir *dir;
>  	int ret;
>  
> +	dir = malloc_cache_aligned(sizeof(*dir));
>  	if (!dir)
>  		return -ENOMEM;
> +	memset(dir, 0, sizeof(*dir));
>  
>  	ret = fat_itr_root(&dir->itr, &dir->fsdata);
>  	if (ret)

Reviewed-by: Lukasz Majewski <lukma at denx.de>

Best regards,

Lukasz Majewski

--

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