On Mon, Aug 20, 2018 at 11:25:59PM -0700, Andrey Smirnov wrote:
> Pwrite() will return the amount bytes written or negative error code
> on success, so we need to do two things with it:
>
> 1. Check it against "image_len" to make sure we actually wrote all
> of the data
>
> 2. Set it to zero in case of success, since that is what code in
> barebox_update() expects to happen
>
> Signed-off-by: Andrey Smirnov <andrew.smir...@gmail.com>
> ---
> arch/arm/mach-imx/imx-bbu-internal.c | 11 +++++++++--
> 1 file changed, 9 insertions(+), 2 deletions(-)
>
> diff --git a/arch/arm/mach-imx/imx-bbu-internal.c
> b/arch/arm/mach-imx/imx-bbu-internal.c
> index d83eb972c..70af5ef84 100644
> --- a/arch/arm/mach-imx/imx-bbu-internal.c
> +++ b/arch/arm/mach-imx/imx-bbu-internal.c
> @@ -86,6 +86,7 @@ static int imx_bbu_write_device(struct
> imx_internal_bbu_handler *imx_handler,
> const void *buf, int image_len)
> {
> int fd, ret, offset = 0;
> + bool partial_write;
>
> fd = open(devicefile, O_RDWR | O_CREAT);
> if (fd < 0)
> @@ -117,8 +118,14 @@ static int imx_bbu_write_device(struct
> imx_internal_bbu_handler *imx_handler,
> }
>
> ret = pwrite(fd, buf, image_len, offset);
> - if (ret < 0)
> + partial_write = ret > 0 && ret != image_len;
> + if (ret < 0 || partial_write) {
> + ret = partial_write ? -EIO : ret;
> +
> + pr_err("writing to %s failed with %s\n", devicefile,
> + strerror(-ret));
> goto err_close;
Do we need a pwrite_full analog to write_full?
Sascha
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