This patch prevents to call nouveau_device_del twice on the same device.

Encountered this case when nvc0_screen_create fails with:
nvc0_screen_create:717 - Error allocating PGRAPH context for M2MF: -16

https://bugs.freedesktop.org/show_bug.cgi?id=70354

Signed-off-by: Julien Isorce <j.iso...@samsung.com>
---
 src/gallium/drivers/nouveau/nouveau_screen.c   | 8 ++++++--
 src/gallium/drivers/nouveau/nv30/nv30_screen.c | 1 +
 src/gallium/drivers/nouveau/nv50/nv50_screen.c | 1 +
 src/gallium/drivers/nouveau/nvc0/nvc0_screen.c | 1 +
 4 files changed, 9 insertions(+), 2 deletions(-)

diff --git a/src/gallium/drivers/nouveau/nouveau_screen.c 
b/src/gallium/drivers/nouveau/nouveau_screen.c
index b2290e7..2bd6d4f 100644
--- a/src/gallium/drivers/nouveau/nouveau_screen.c
+++ b/src/gallium/drivers/nouveau/nouveau_screen.c
@@ -177,13 +177,17 @@ nouveau_screen_init(struct nouveau_screen *screen, struct 
nouveau_device *dev)
        screen->device = dev;
 
        ret = nouveau_client_new(screen->device, &screen->client);
-       if (ret)
+       if (ret) {
+               screen->device = 0;
                return ret;
+       }
        ret = nouveau_pushbuf_new(screen->client, screen->channel,
                                  4, 512 * 1024, 1,
                                  &screen->pushbuf);
-       if (ret)
+       if (ret) {
+               screen->device = 0;
                return ret;
+       }
 
         /* getting CPU time first appears to be more accurate */
         screen->cpu_gpu_time_delta = os_time_get();
diff --git a/src/gallium/drivers/nouveau/nv30/nv30_screen.c 
b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
index 0330164..54af655 100644
--- a/src/gallium/drivers/nouveau/nv30/nv30_screen.c
+++ b/src/gallium/drivers/nouveau/nv30/nv30_screen.c
@@ -411,6 +411,7 @@ nv30_screen_destroy(struct pipe_screen *pscreen)
 #define FAIL_SCREEN_INIT(str, err)                    \
    do {                                               \
       NOUVEAU_ERR(str, err);                          \
+      screen->base.device = 0;                        \
       nv30_screen_destroy(pscreen);                   \
       return NULL;                                    \
    } while(0)
diff --git a/src/gallium/drivers/nouveau/nv50/nv50_screen.c 
b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
index ec51d00..a1fad42 100644
--- a/src/gallium/drivers/nouveau/nv50/nv50_screen.c
+++ b/src/gallium/drivers/nouveau/nv50/nv50_screen.c
@@ -905,6 +905,7 @@ nv50_screen_create(struct nouveau_device *dev)
    return pscreen;
 
 fail:
+   screen->base.device = 0;
    nv50_screen_destroy(pscreen);
    return NULL;
 }
diff --git a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c 
b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
index af8e5f7..28fee35 100644
--- a/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
+++ b/src/gallium/drivers/nouveau/nvc0/nvc0_screen.c
@@ -609,6 +609,7 @@ nvc0_screen_resize_tls_area(struct nvc0_screen *screen,
 #define FAIL_SCREEN_INIT(str, err)                    \
    do {                                               \
       NOUVEAU_ERR(str, err);                          \
+      screen->base.device = 0;                        \
       nvc0_screen_destroy(pscreen);                   \
       return NULL;                                    \
    } while(0)
-- 
1.9.1

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