linux-kernel - Re: [PATCH v1] driver core: platform: Propagate error from insert

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Date:   Wed, 3 Apr 2019 14:29:23 +0300
From:   Andy Shevchenko <andriy.shevchenko@...ux.intel.com>
To:     "Rafael J. Wysocki" <rafael@...nel.org>
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v1] driver core: platform: Propagate error from
 insert_resource()

On Tue, Apr 02, 2019 at 06:02:40PM +0200, Rafael J. Wysocki wrote:
> On Tue, Apr 2, 2019 at 5:59 PM Andy Shevchenko
> <andriy.shevchenko@...ux.intel.com> wrote:
> >
> > Since insert_resource() might return an error we don't need
> > to shadow its error code and would safely propagate to the user.

> > -               if (p && insert_resource(p, r)) {
> > +               if (p && (ret = insert_resource(p, r))) {
> 
> I would put the assignment here.
> 
> >                         dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
> > -                       ret = -EBUSY;
> >                         goto failed;
> >                 }

Something like this?

diff --git a/drivers/base/platform.c b/drivers/base/platform.c
index dab0a5abc391..9cf9e2af9efd 100644
--- a/drivers/base/platform.c
+++ b/drivers/base/platform.c
@@ -438,10 +438,12 @@ int platform_device_add(struct platform_device *pdev)
                                p = &ioport_resource;
                }

-               if (p && insert_resource(p, r)) {
-                       dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
-                       ret = -EBUSY;
-                       goto failed;
+               if (p) {
+                       ret = insert_resource(p, r);
+                       if (ret) {
+                               dev_err(&pdev->dev, "failed to claim resource %d: %pR\n", i, r);
+                               goto failed;
+                       }
                }
        }


-- 
With Best Regards,
Andy Shevchenko