Re: [PATCH 2/8] console: factorise function to get the console by name

[Sascha Hauer <s.hauer@pengutronix.de>]

On Sun, Oct 06, 2013 at 08:38:56PM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> On 13:24 Sun 06 Oct     , Sascha Hauer wrote:
> > On Thu, Oct 03, 2013 at 09:21:54AM +0200, Jean-Christophe PLAGNIOL-VILLARD wrote:
> > > rename it to console_get_by_name
> > > 
> > > Signed-off-by: Jean-Christophe PLAGNIOL-VILLARD <plagnioj@jcrosoft.com>
> > > ---
> > > +struct console_device *console_get_by_name(const char *cname)
> > > +{
> > > +	struct console_device *cdev;
> > > +	const char *target;
> > > +
> > > +	for_each_console(cdev) {
> > > +		target = dev_id(&cdev->class_dev);
> > > +		if (strcmp(cname, target))
> > > +			continue;
> > > +		if ((cdev->f_active & (CONSOLE_STDIN | CONSOLE_STDOUT))
> > > +			return cdev;
> > > +		return NULL;
> > > +	}
> > > +	return NULL;
> > > +}
> > > +EXPORT_SYMBOL(console_get_by_name);
> > 
> > I think this function should return the console regardless of whether
> > it's active or not. This makes the console_get_by_name_flags you
> > introduce later unnecessary. Also the loadxyz code shouldn't care if
> > it's activated but instead just activate the console if necessary.
> 
> agreed that's why I change this in patch 5
> as now the loadxyz just check if the cdev support input and output
> and not if active or not

Ok, I somewhat misread the patch. I still think though that a function

struct console_device *console_get_by_name(const char *cname, int flags);

is a bit unclear. This function should either return the cdev by name
*or* check the flags, but not both,

The loadxy code now ends up with:

	if (cname)
		cdev = console_get_by_name(cname, CONSOLE_STDIN & CONSOLE_STDOUT);
	else
		cdev = console_get_first_active();

So if cname is given you explicitly ask for a console capable of input
*and* output. If not, you ask for the first actve console, that is the
first console which has input *or* output activated.

The loadxy code should rather look like:

	if (cname)
		cdev = console_get_by_name(cname);
	else
		cdev = console_get_first_active();

	if (!cdev)
		barf_and_bail_out;

	if (!console_can_do_input(cdev) || !console_can_do_output())
		barf_and_bail_out;


Sascha

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