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Commit 8bbf50fe authored by Jonathan Corbet's avatar Jonathan Corbet
Browse files

viafb: Fix initialization error paths 



Properly localize error cleanup, and make sure that the iomem regions are
unmapped if framebuffer initialization fails.

Reported-by: default avatarBruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: default avatarJonathan Corbet <corbet@lwn.net>
parent 27fe971d

drivers/video/via/via-core.c

+24 −11
Original line number Diff line number Diff line
@@ -453,26 +453,40 @@ static int viafb_get_fb_size_from_pci(int chip_type) 
 */

static int __devinit via_pci_setup_mmio(struct viafb_dev *vdev)

{

	int ret;

	/*

	 * Hook up to the device registers.

	 * Hook up to the device registers.  Note that we soldier

	 * on if it fails; the framebuffer can operate (without

	 * acceleration) without this region.

	 */

	vdev->engine_start = pci_resource_start(vdev->pdev, 1);

	vdev->engine_len = pci_resource_len(vdev->pdev, 1);

	/* If this fails, others will notice later */

	vdev->engine_mmio = ioremap_nocache(vdev->engine_start,

			vdev->engine_len);



	if (vdev->engine_mmio == NULL)

		dev_err(&vdev->pdev->dev,

				"Unable to map engine MMIO; operation will be "

				"slow and crippled.\n");

	/*

	 * Likewise with I/O memory.

	 * Map in framebuffer memory.  For now, failure here is

	 * fatal.  Unfortunately, in the absence of significant

	 * vmalloc space, failure here is also entirely plausible.

	 * Eventually we want to move away from mapping this

	 * entire region.

	 */

	vdev->fbmem_start = pci_resource_start(vdev->pdev, 0);

	vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);

	if (vdev->fbmem_len < 0)

		return vdev->fbmem_len;

	ret = vdev->fbmem_len = viafb_get_fb_size_from_pci(vdev->chip_type);

	if (ret < 0)

		goto out_unmap;

	vdev->fbmem = ioremap_nocache(vdev->fbmem_start, vdev->fbmem_len);

	if (vdev->fbmem == NULL)

		return -ENOMEM;

	if (vdev->fbmem == NULL) {

		ret = -ENOMEM;

		goto out_unmap;

	}

	return 0;

out_unmap:

	iounmap(vdev->engine_mmio);

	return ret;

}



static void __devexit via_pci_teardown_mmio(struct viafb_dev *vdev)
@@ -572,12 +586,11 @@ static int __devinit via_pci_probe(struct pci_dev *pdev, 
	viafb_int_init();

	via_setup_subdevs(&global_dev);

	/*

	 * Set up the framebuffer.

	 * Set up the framebuffer device

	 */

	ret = via_fb_pci_probe(&global_dev);

	if (ret)

		goto out_subdevs;



	return 0;



out_subdevs: