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SubjectRe: [PATCH v3 1/2] init/do_mounts.c: ignore final \n in name_to_dev_t
On Tue, 28 Jan 2014 10:59:26 -0800 Sebastian Capella <sebastian.capella@linaro.org> wrote:

> > Do you have any feedback for me on this?
> >
> > I'm happy do make any changes you think are correct, but I'm unsure if
> > you're asking me for option #3 above. It's quite an intrusive change,
> > and changes old, established code and I'd like confirmation that's what
> > you'd like before proceeding down that path.
> >
> > I've submitted patches with both options #1 and #2 above.
> >
> > Thanks,
> >
> > Sebastian
>
> Ping.
>
> Sorry for the lapse in attention to this.
>
> Could you please clarify what is needed for this to be acceptable?
> I'm a little confused about what is being asked of me.

The problem is that kernel/power/hibernate.c:resume_store() is handed a
newline-terminated string, yes? And if it blindly hands that string
over to name_to_dev_t(), name_to_dev_t() fails because the string is
wrong.

This is an oddity of the sysfs->kernel interface and altering
name_to_dev_t doesn't really seem appropriate for this problem - it
would be better to fix the caller to pass in the correct string.

Something like...

/*
* Clean up a string which may have leading and/or trailing whitespace (as
* defined by isspace()) by trimming off that whitespace. Returns an address
* which the caller must kfree(), or NULL on error.
*/
char *strim_copy(const char *s, gfp_t gfp)
{
char *ret = kstrdup(skip_spaces(s), gfp);

if (ret)
strim(ret);
return ret;
}
EXPORT_SYMBOL(strim_copy);


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