Re: [PATCH] Don't explode on swsusp failure to find swap

[Benjamin Herrenschmidt <benh@kernel.crashing.org>]

On Wed, 2005-06-01 at 00:45 +1000, Benjamin Herrenschmidt wrote:
> On Tue, 2005-05-31 at 12:36 +0200, Pavel Machek wrote:
> > Hi!
> > 
> > > If we specify a swap device for swsusp using resume= kernel argument and
> > > that device doesn't exist in the swap list, we end up calling
> > > swsusp_free() before we have allocated pagedir_save. That causes us to
> > > explode when trying to free it.
> > > 
> > > Pavel, does that look right ?
> > 
> > It looks like a workaround. We should not call swsusp_free in case
> > device does not exists. Quick look did not reveal where the bug comes
> > from, can you try to trace it?
> > 								Pavel
> 
> Well, the bug comes from arch code calling swsusp_save() which fails,
> then we call swsusp_free()

More specifically, arch suspend calls swsusp_save().

It fails and returns the error to the arch asm code, which itself
returns it to it's caller swsusp_suspend(), which does that:

 	if ((error = swsusp_arch_suspend()))
		swsusp_free();

Ben.