[U-Boot] [PATCH] fdt: Check if the FDT address is configured

[Marek Vasut <marex@denx.de>]

Dear Jerry Van Baren,

> Hi Marek,
> 
> I'll queue this up this weekend.
> 
> The merge window for v2012.10 closed September 18.  Unless there is an
> overriding urgency, the patch will go into the following release.

It's a fix, I'd say queue it for current release. Only fixes go into current 
release after MW closed.

Thanks Jerry!

> On 09/05/2012 02:34 AM, Marek Vasut wrote:
> > In case the "fdt addr" command wasn't ran yet and any other "fdt"
> > subcommand was issued, the system crashed due to NULL pointer being
> > used.
> > 
> > This is caused by "fdt addr" command setting up a pointer to the
> > FDT memory location. Prior issuing "fdt addr", the pointer is NULL
> > so calling any other subcommands crashed the u-boot.
> > 
> > Signed-off-by: Marek Vasut <marex@denx.de>
> > Cc: Simon Glass <sjg@chromium.org>
> > ---
> > 
> >  common/cmd_fdt.c |   13 ++++++++++++-
> >  1 file changed, 12 insertions(+), 1 deletion(-)
> > 
> > Note: Damn, I'm falling asleep already :-( I hope the text above at
> > 
> >       least makes sense though.
> > 
> > diff --git a/common/cmd_fdt.c b/common/cmd_fdt.c
> > index 9a5c53e..e2225c4 100644
> > --- a/common/cmd_fdt.c
> > +++ b/common/cmd_fdt.c
> > @@ -114,10 +114,21 @@ int do_fdt (cmd_tbl_t * cmdtp, int flag, int argc,
> > char * const argv[])
> > 
> >  			}
> >  		
> >  		}
> > 
> > +		return CMD_RET_SUCCESS;
> > +	}
> > +
> > +	if (!working_fdt) {
> > +		puts(
> > +			"No FDT memory address configured. Please configure\n"
> > +			"the FDT address via \"fdt addr <address>\" command.\n"
> > +			"Aborting!\n");
> > +		return CMD_RET_FAILURE;
> > +	}
> > +
> > 
> >  	/*
> >  	
> >  	 * Move the working_fdt
> >  	 */
> > 
> > -	} else if (strncmp(argv[1], "mo", 2) == 0) {
> > +	if (strncmp(argv[1], "mo", 2) == 0) {
> > 
> >  		struct fdt_header *newaddr;
> >  		int  len;
> >  		int  err;
> 
> Thanks,
> gvb

Best regards,
Marek Vasut