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| author | Jonathan Corbet <corbet@lwn.net> | 2010-04-30 10:03:57 -0600 |
|---|---|---|
| committer | Jonathan Corbet <corbet@lwn.net> | 2010-05-07 17:17:40 -0600 |
| commit | 8bbf50fe9c0fb8d83b993ae6d88a4ce27d81b999 (patch) | |
| tree | e49180692af9f2a2ccb5455dc1265509c129aa72 /drivers/video/via | |
| parent | 27fe971d08b43f649358745a55f3c48ac6f413f8 (diff) | |
| download | kernel_samsung_smdk4412-8bbf50fe9c0fb8d83b993ae6d88a4ce27d81b999.tar.gz kernel_samsung_smdk4412-8bbf50fe9c0fb8d83b993ae6d88a4ce27d81b999.tar.bz2 kernel_samsung_smdk4412-8bbf50fe9c0fb8d83b993ae6d88a4ce27d81b999.zip | |
viafb: Fix initialization error paths
Properly localize error cleanup, and make sure that the iomem regions are
unmapped if framebuffer initialization fails.
Reported-by: Bruno Prémont <bonbons@linux-vserver.org>
Signed-off-by: Jonathan Corbet <corbet@lwn.net>
Diffstat (limited to 'drivers/video/via')
| -rw-r--r-- | drivers/video/via/via-core.c | 35 |
1 files changed, 24 insertions, 11 deletions
diff --git a/drivers/video/via/via-core.c b/drivers/video/via/via-core.c index 9929bb1549b..188c0022dcb 100644 --- a/drivers/video/via/via-core.c +++ b/drivers/video/via/via-core.c @@ -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: |