linux-kernel - Re: [PATCH] omapfb: dss: Handle return error in dss_init

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Date:   Wed, 08 Feb 2017 11:25:47 +0100
From:   Bartlomiej Zolnierkiewicz <b.zolnierkie@...sung.com>
To:     Arvind Yadav <arvind.yadav.cs@...il.com>
Cc:     tomi.valkeinen@...com, linux-omap@...r.kernel.org,
        linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH] omapfb: dss: Handle return error in dss_init_ports.


Hi,

On Tuesday, February 07, 2017 05:41:37 PM Arvind Yadav wrote:
> Hi,
> 
> In dss_init_ports, There is no need to add dss_uninit_ports before 
> returning.
> Because it's already take care in dss_bind. dss_bind  is handling
> dss_uninit_ports in error path.

It doesn't handle cleanup of partially initialized ports,
please look at the code:

...
	r = dss_init_ports(pdev);
	if (r)
		goto err_init_ports;
...
err_runtime_get:
	pm_runtime_disable(&pdev->dev);
	dss_uninit_ports(pdev);
err_init_ports:
	if (dss.video1_pll)
		dss_video_pll_uninit(dss.video1_pll);
...

dss_uninit_ports() is not called on partially initialized
ports (when dss_init_ports() returns an error we go straight
into err_init_ports label and skip dss_uninit_ports())

> -Arvind
> 
> 
> On Monday 06 February 2017 08:58 PM, Bartlomiej Zolnierkiewicz wrote:
> > dpi_uninit_port() & sdi_uninit_port() skip not fully
> > initialized port

Best regards,
--
Bartlomiej Zolnierkiewicz
Samsung R&D Institute Poland
Samsung Electronics