On Mon, Feb 10, 2020 at 10:53:10AM +0100, Gerd Hoffmann wrote:
> Move final cleanups from cirrus_pci_remove() to the new callback.
> Add drm_atomic_helper_shutdown() call to cirrus_pci_remove().
>
> Set pointers to NULL after iounmap() and check them before using
> them to make sure we don't touch released hardware.
>
> Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx>
> ---
> drivers/gpu/drm/cirrus/cirrus.c | 23 +++++++++++++++++++++--
> 1 file changed, 21 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/gpu/drm/cirrus/cirrus.c b/drivers/gpu/drm/cirrus/cirrus.c
> index a91fb0d7282c..128db11ed4d3 100644
> --- a/drivers/gpu/drm/cirrus/cirrus.c
> +++ b/drivers/gpu/drm/cirrus/cirrus.c
> @@ -154,6 +154,9 @@ static void cirrus_set_start_address(struct cirrus_device *cirrus, u32 offset)
> u32 addr;
> u8 tmp;
>
> + if (!cirrus->mmio)
> + return;
Same as with the previous one, I think you're looking for
drm_dev_enter/exit. And missing patch changelog. remove/release split
looks good otherwise.
-Daniel
> +
> addr = offset >> 2;
> wreg_crt(cirrus, 0x0c, (u8)((addr >> 8) & 0xff));
> wreg_crt(cirrus, 0x0d, (u8)(addr & 0xff));
> @@ -179,6 +182,9 @@ static int cirrus_mode_set(struct cirrus_device *cirrus,
> int tmp;
> int sr07 = 0, hdr = 0;
>
> + if (!cirrus->mmio)
> + return -1;
> +
> htotal = mode->htotal / 8;
> hsyncend = mode->hsync_end / 8;
> hsyncstart = mode->hsync_start / 8;
> @@ -301,6 +307,9 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
> struct cirrus_device *cirrus = fb->dev->dev_private;
> void *vmap;
>
> + if (!cirrus->vram)
> + return -ENODEV;
> +
> vmap = drm_gem_shmem_vmap(fb->obj[0]);
> if (!vmap)
> return -ENOMEM;
> @@ -502,6 +511,14 @@ static void cirrus_mode_config_init(struct cirrus_device *cirrus)
>
> /* ------------------------------------------------------------------ */
>
> +static void cirrus_release(struct drm_device *dev)
> +{
> + struct cirrus_device *cirrus = dev->dev_private;
> +
> + drm_mode_config_cleanup(dev);
> + kfree(cirrus);
> +}
> +
> DEFINE_DRM_GEM_FOPS(cirrus_fops);
>
> static struct drm_driver cirrus_driver = {
> @@ -515,6 +532,7 @@ static struct drm_driver cirrus_driver = {
>
> .fops = &cirrus_fops,
> DRM_GEM_SHMEM_DRIVER_OPS,
> + .release = cirrus_release,
> };
>
> static int cirrus_pci_probe(struct pci_dev *pdev,
> @@ -599,11 +617,12 @@ static void cirrus_pci_remove(struct pci_dev *pdev)
> struct cirrus_device *cirrus = dev->dev_private;
>
> drm_dev_unregister(dev);
> - drm_mode_config_cleanup(dev);
> + drm_atomic_helper_shutdown(dev);
> iounmap(cirrus->mmio);
> + cirrus->mmio = NULL;
> iounmap(cirrus->vram);
> + cirrus->vram = NULL;
> drm_dev_put(dev);
> - kfree(cirrus);
> pci_release_regions(pdev);
> }
>
> --
> 2.18.1
>
--
Daniel Vetter
Software Engineer, Intel Corporation
http://blog.ffwll.ch
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