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Date: Sun, 21 Feb 2010 10:35:29 -0300
From: Thadeu Lima de Souza Cascardo <cascardo@...oscopio.com>
To: Bruno Prémont <bonbons@...ux-vserver.org>
Cc: Andrew Morton <akpm@...ux-foundation.org>,
Greg Kroah-Hartman <gregkh@...e.de>,
Daniel Oliveira Nascimento <don@...t.com.br>,
Len Brown <len.brown@...el.com>,
Anisse Astier <anisse@...ier.eu>,
Thomas Renninger <trenn@...e.de>,
Matt Chen <machen@...ell.com>,
Harald Welte <laforge@...monks.org>,
Martin Lucina <mato@...elna.sk>,
Bjorn Helgaas <bjorn.helgaas@...com>,
pancho horrillo <pancho@...cho.name>,
Mike Frysinger <vapier@...too.org>,
Vivek Kutal <vivek.kutal@...ngo.com>,
Michael Hennerich <michael.hennerich@...log.com>,
linux-fbdev@...r.kernel.org, linux-kernel@...r.kernel.org,
linux-usb@...r.kernel.org
Subject: Re: [PATCH 3/3] backlight: fix missing/incomplete registration
failure handling
On Sun, Feb 21, 2010 at 12:28:31AM +0100, Bruno Prémont wrote:
> Check newly registered backlight_device for error and properly
> return error to parent
>
> Signed-off-by: Bruno Prémont <bonbons@...ux-vserver.org>
> ---
> drivers/platform/x86/classmate-laptop.c | 2 ++
> drivers/platform/x86/msi-wmi.c | 4 +++-
> drivers/platform/x86/panasonic-laptop.c | 4 +++-
> drivers/usb/misc/appledisplay.c | 1 +
> drivers/video/bf54x-lq043fb.c | 8 ++++++++
> drivers/video/bfin-t350mcqb-fb.c | 8 ++++++++
> 6 files changed, 25 insertions(+), 2 deletions(-)
>
I think you should split the patch for every driver. Then, every
mantainer may ack only its particular section of the patch.
> diff --git a/drivers/platform/x86/classmate-laptop.c b/drivers/platform/x86/classmate-laptop.c
> index bfae789..66f6aad 100644
> --- a/drivers/platform/x86/classmate-laptop.c
> +++ b/drivers/platform/x86/classmate-laptop.c
> @@ -463,6 +463,8 @@ static int cmpc_bl_add(struct acpi_device *acpi)
>
> bd = backlight_device_register("cmpc_bl", &acpi->dev,
> acpi->handle, &cmpc_bl_ops);
> + if (IS_ERR(bd))
> + return PTR_ERR(bd);
> bd->props.max_brightness = 7;
> dev_set_drvdata(&acpi->dev, bd);
> return 0;
> diff --git a/drivers/platform/x86/msi-wmi.c b/drivers/platform/x86/msi-wmi.c
> index 5f7cff1..2ffbfcf 100644
> --- a/drivers/platform/x86/msi-wmi.c
> +++ b/drivers/platform/x86/msi-wmi.c
> @@ -251,8 +251,10 @@ static int __init msi_wmi_init(void)
> if (!acpi_video_backlight_support()) {
> backlight = backlight_device_register(DRV_NAME,
> NULL, NULL, &msi_backlight_ops);
> - if (IS_ERR(backlight))
> + if (IS_ERR(backlight)) {
> + err = PTR_ERR(backlight);
> goto err_free_input;
> + }
>
> backlight->props.max_brightness = ARRAY_SIZE(backlight_map) - 1;
> err = bl_get(NULL);
> diff --git a/drivers/platform/x86/panasonic-laptop.c b/drivers/platform/x86/panasonic-laptop.c
> index 9012d8d..9b17343 100644
> --- a/drivers/platform/x86/panasonic-laptop.c
> +++ b/drivers/platform/x86/panasonic-laptop.c
> @@ -644,8 +644,10 @@ static int acpi_pcc_hotkey_add(struct acpi_device *device)
> /* initialize backlight */
> pcc->backlight = backlight_device_register("panasonic", NULL, pcc,
> &pcc_backlight_ops);
> - if (IS_ERR(pcc->backlight))
> + if (IS_ERR(pcc->backlight)) {
> + result = PTR_ERR(pcc->backlight);
> goto out_input;
> + }
>
> if (!acpi_pcc_retrieve_biosdata(pcc, pcc->sinf)) {
> ACPI_DEBUG_PRINT((ACPI_DB_ERROR,
> diff --git a/drivers/usb/misc/appledisplay.c b/drivers/usb/misc/appledisplay.c
> index ef79ca2..413f154 100644
> --- a/drivers/usb/misc/appledisplay.c
> +++ b/drivers/usb/misc/appledisplay.c
> @@ -283,6 +283,7 @@ static int appledisplay_probe(struct usb_interface *iface,
> &appledisplay_bl_data);
> if (IS_ERR(pdata->bd)) {
> dev_err(&iface->dev, "Backlight registration failed\n");
> + retval = PTR_ERR(pdata->bd);
> goto error;
> }
>
> diff --git a/drivers/video/bf54x-lq043fb.c b/drivers/video/bf54x-lq043fb.c
> index db4e6f7..a589216 100644
> --- a/drivers/video/bf54x-lq043fb.c
> +++ b/drivers/video/bf54x-lq043fb.c
> @@ -678,6 +678,12 @@ static int __devinit bfin_bf54x_probe(struct platform_device *pdev)
> bl_dev =
> backlight_device_register("bf54x-bl", NULL, NULL,
> &bfin_lq043fb_bl_ops);
> + if (IS_ERR(bl_dev)) {
> + printk(KERN_ERR DRIVER_NAME
> + ": unable to register backlight.\n");
> + ret = -EINVAL;
> + goto out9;
> + }
> bl_dev->props.max_brightness = 255;
>
> lcd_dev = lcd_device_register(DRIVER_NAME, &pdev->dev, NULL, &bfin_lcd_ops);
> @@ -686,6 +692,8 @@ static int __devinit bfin_bf54x_probe(struct platform_device *pdev)
>
> return 0;
>
> +out9:
> + unregister_framebuffer(fbinfo);
> out8:
> free_irq(info->irq, info);
> out7:
> diff --git a/drivers/video/bfin-t350mcqb-fb.c b/drivers/video/bfin-t350mcqb-fb.c
> index bc204c6..fe1492b 100644
> --- a/drivers/video/bfin-t350mcqb-fb.c
> +++ b/drivers/video/bfin-t350mcqb-fb.c
> @@ -572,6 +572,12 @@ static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
> bl_dev =
> backlight_device_register("bf52x-bl", NULL, NULL,
> &bfin_lq043fb_bl_ops);
> + if (IS_ERR(bl_dev)) {
> + printk(KERN_ERR DRIVER_NAME
> + ": unable to register backlight.\n");
> + ret = -EINVAL;
> + goto out9;
> + }
> bl_dev->props.max_brightness = 255;
>
> lcd_dev = lcd_device_register(DRIVER_NAME, NULL, &bfin_lcd_ops);
> @@ -580,6 +586,8 @@ static int __devinit bfin_t350mcqb_probe(struct platform_device *pdev)
>
> return 0;
>
> +out9:
> + unregister_framebuffer(fbinfo);
> out8:
> free_irq(info->irq, info);
> out7:
> --
> 1.6.4.4
>
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