[U-Boot] [U-Boot,1/5] fs/fat/fat_write: Fix buffer alignments

[Tom Rini <trini@konsulko.com>]

On Mon, Sep 28, 2015 at 03:45:28PM +0200, Beno?t Th?baudeau wrote:

> set_cluster() was using a temporary buffer without enforcing its
> alignment for DMA and cache. Moreover, it did not check the alignment of
> the passed buffer, which can come directly from applicative code or from
> the user.
> 
> This could cause random data corruption, which has been observed on
> i.MX25 writing to an SD card.
> 
> Fix this by only passing ARCH_DMA_MINALIGN-aligned buffers to
> disk_write(), which requires the introduction of a buffer bouncing
> mechanism for the misaligned buffers passed to set_cluster().
> 
> By the way, improve the handling of the corresponding return values from
> disk_write():
>  - print them with debug() in case of error,
>  - consider that there is an error is disk_write() returns a smaller
>    block count than the requested one, not only if its return value is
>    negative.
> 
> After this change, set_cluster() and get_cluster() are almost
> symmetrical.
> 
> Signed-off-by: Beno?t Th?baudeau <benoit@wsystem.com>

Applied to u-boot/master, thanks!

-- 
Tom
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