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drm/mgag200: Fail on I2C initialization errors
Initialization of the I2C adapter was allowed to fail. The mgag200 driver would have continued without DDC support. Had this happened in practice, it would have led to segmentation faults in the connector code. Resolve this problem by failing driver initialization on I2C- related errors. v2: * initialize 'ret' before drm_err() (kernel test robot) Signed-off-by: Thomas Zimmermann <tzimmermann@suse.de> Reviewed-by: Jocelyn Falempe <jfalempe@redhat.com> Tested-by: Jocelyn Falempe <jfalempe@redhat.com> Link: https://patchwork.freedesktop.org/patch/msgid/20220516134343.6085-3-tzimmermann@suse.de
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2 changed files with 13 additions and 7 deletions
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@ -120,7 +120,7 @@ struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
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i2c = kzalloc(sizeof(struct mga_i2c_chan), GFP_KERNEL);
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if (!i2c)
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return NULL;
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return ERR_PTR(-ENOMEM);
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i2c->data = data;
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i2c->clock = clock;
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@ -142,11 +142,14 @@ struct mga_i2c_chan *mgag200_i2c_create(struct drm_device *dev)
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i2c->bit.getscl = mga_gpio_getscl;
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ret = i2c_bit_add_bus(&i2c->adapter);
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if (ret) {
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kfree(i2c);
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i2c = NULL;
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}
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if (ret)
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goto err_kfree;
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return i2c;
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err_kfree:
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kfree(i2c);
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return ERR_PTR(ret);
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}
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void mgag200_i2c_destroy(struct mga_i2c_chan *i2c)
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@ -849,8 +849,11 @@ static int mgag200_vga_connector_init(struct mga_device *mdev)
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int ret;
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i2c = mgag200_i2c_create(dev);
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if (!i2c)
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drm_warn(dev, "failed to add DDC bus\n");
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if (IS_ERR(i2c)) {
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ret = PTR_ERR(i2c)
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drm_err(dev, "failed to add DDC bus: %d\n", ret);
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return ret;
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}
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ret = drm_connector_init_with_ddc(dev, connector,
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&mga_vga_connector_funcs,
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