[PATCH v4] drm/cirrus: add drm_driver.release callback.

[Gerd Hoffmann]

Move final cleanups from cirrus_pci_remove() to the new callback.
Add drm_atomic_helper_shutdown() call to cirrus_pci_remove().

Use drm_dev_{enter,exit,unplug} to avoid touching hardware after
device removal.

v4: add changelog.
v3: use drm_dev*.
v2: stop touching hardware after pci_remove().

Signed-off-by: Gerd Hoffmann <kra...@redhat.com>
---
 drivers/gpu/drm/cirrus/cirrus.c | 43 ++++++++++++++++++++++++++++-----
 1 file changed, 37 insertions(+), 6 deletions(-)

diff --git a/drivers/gpu/drm/cirrus/cirrus.c b/drivers/gpu/drm/cirrus/cirrus.c
index a91fb0d7282c..d2ff63ce8eaf 100644
--- a/drivers/gpu/drm/cirrus/cirrus.c
+++ b/drivers/gpu/drm/cirrus/cirrus.c
@@ -151,9 +151,13 @@ static int cirrus_pitch(struct drm_framebuffer *fb)
 
 static void cirrus_set_start_address(struct cirrus_device *cirrus, u32 offset)
 {
+       int idx;
        u32 addr;
        u8 tmp;
 
+       if (!drm_dev_enter(&cirrus->dev, &idx))
+               return;
+
        addr = offset >> 2;
        wreg_crt(cirrus, 0x0c, (u8)((addr >> 8) & 0xff));
        wreg_crt(cirrus, 0x0d, (u8)(addr & 0xff));
@@ -168,6 +172,8 @@ static void cirrus_set_start_address(struct cirrus_device 
*cirrus, u32 offset)
        tmp &= 0x7f;
        tmp |= (addr >> 12) & 0x80;
        wreg_crt(cirrus, 0x1d, tmp);
+
+       drm_dev_exit(idx);
 }
 
 static int cirrus_mode_set(struct cirrus_device *cirrus,
@@ -176,9 +182,12 @@ static int cirrus_mode_set(struct cirrus_device *cirrus,
 {
        int hsyncstart, hsyncend, htotal, hdispend;
        int vtotal, vdispend;
-       int tmp;
+       int tmp, idx;
        int sr07 = 0, hdr = 0;
 
+       if (!drm_dev_enter(&cirrus->dev, &idx))
+               return -1;
+
        htotal = mode->htotal / 8;
        hsyncend = mode->hsync_end / 8;
        hsyncstart = mode->hsync_start / 8;
@@ -264,6 +273,7 @@ static int cirrus_mode_set(struct cirrus_device *cirrus,
                hdr = 0xc5;
                break;
        default:
+               drm_dev_exit(idx);
                return -1;
        }
 
@@ -292,6 +302,8 @@ static int cirrus_mode_set(struct cirrus_device *cirrus,
 
        /* Unblank (needed on S3 resume, vgabios doesn't do it then) */
        outb(0x20, 0x3c0);
+
+       drm_dev_exit(idx);
        return 0;
 }
 
@@ -300,10 +312,16 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
 {
        struct cirrus_device *cirrus = fb->dev->dev_private;
        void *vmap;
+       int idx, ret;
 
+       ret = -ENODEV;
+       if (!drm_dev_enter(&cirrus->dev, &idx))
+               goto out;
+
+       ret = -ENOMEM;
        vmap = drm_gem_shmem_vmap(fb->obj[0]);
        if (!vmap)
-               return -ENOMEM;
+               goto out_dev_exit;
 
        if (cirrus->cpp == fb->format->cpp[0])
                drm_fb_memcpy_dstclip(cirrus->vram,
@@ -323,7 +341,12 @@ static int cirrus_fb_blit_rect(struct drm_framebuffer *fb,
                WARN_ON_ONCE("cpp mismatch");
 
        drm_gem_shmem_vunmap(fb->obj[0], vmap);
-       return 0;
+       ret = 0;
+
+out_dev_exit:
+       drm_dev_exit(idx);
+out:
+       return ret;
 }
 
 static int cirrus_fb_blit_fullscreen(struct drm_framebuffer *fb)
@@ -502,6 +525,14 @@ 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 +546,7 @@ 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,
@@ -598,12 +630,11 @@ static void cirrus_pci_remove(struct pci_dev *pdev)
        struct drm_device *dev = pci_get_drvdata(pdev);
        struct cirrus_device *cirrus = dev->dev_private;
 
-       drm_dev_unregister(dev);
-       drm_mode_config_cleanup(dev);
+       drm_dev_unplug(dev);
+       drm_atomic_helper_shutdown(dev);
        iounmap(cirrus->mmio);
        iounmap(cirrus->vram);
        drm_dev_put(dev);
-       kfree(cirrus);
        pci_release_regions(pdev);
 }
 
-- 
2.18.2

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