Hi Giorgio,
On Sat, Apr 16, 2016 at 09:15:04PM +0200, Giorgio wrote:
> Hi,
>
> I'm using barebox on an embedded system with an imx6 cpu, a nor and
> a nand flash.
>
> I recently updated the barebox to v2016.04.0 and noticed that the
> command 'saveenv' was surprisingly quick and actually didn't work.
>
> After a bit of debugging I could track the problem down to a call to the
> function erase() within 'common/environment.c':
>
> int envfs_save(const char *filename, const char *dirname, unsigned flags)
> {
> ...
> ret = erase(envfd, ~0, 0);
>
> /* ENOSYS and EOPNOTSUPP aren't errors here, many devices don't need it */
> if (ret && errno != ENOSYS && errno != EOPNOTSUPP) {
> printf("could not erase %s: %s\n", filename, errno_str());
> goto out;
> }
> ...
>
> The function prototype is:
>
> int erase(int fd, loff_t count, loff_t offset)
>
> in particular the second argument, count, is a signed long long.
>
> Now when calling erase() with a count of ~0 the function will cast it
> to -1 instead of to a 'very big' number and actually never erase
> anything.
>
> I think in these cases it is better to use cpp macros like LLONG_MAX
> or change the type of count to a size_t.
Thanks for reporting this. I stumbled over the same issue a moment ago.
I just sent a patch fixing this to the list.
Sascha
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