We can't hold the mm_lock spinlock as panfrost_mmu_map() can sleep:
BUG: sleeping function called from invalid context at kernel/locking/mutex.c:909
in_atomic(): 1, irqs_disabled(): 0, pid: 974, name: glmark2-es2-drm
1 lock held by glmark2-es2-drm/974:
CPU: 5 PID: 974 Comm: glmark2-es2-drm Tainted: G W L 5.3.0-rc1+ #94
Hardware name: 96boards Rock960 (DT)
Call trace:
dump_backtrace+0x0/0x130
show_stack+0x14/0x20
dump_stack+0xc4/0x10c
___might_sleep+0x158/0x228
__might_sleep+0x50/0x88
__mutex_lock+0x58/0x800
mutex_lock_interruptible_nested+0x1c/0x28
drm_gem_shmem_get_pages+0x24/0xa0
drm_gem_shmem_get_pages_sgt+0x48/0xd0
panfrost_mmu_map+0x38/0xf8 [panfrost]
panfrost_gem_open+0xc0/0xd8 [panfrost]
drm_gem_handle_create_tail+0xe8/0x198
drm_gem_handle_create+0x3c/0x50
panfrost_gem_create_with_handle+0x70/0xa0 [panfrost]
panfrost_ioctl_create_bo+0x48/0x80 [panfrost]
drm_ioctl_kernel+0xb8/0x110
drm_ioctl+0x244/0x3f0
do_vfs_ioctl+0xbc/0x910
ksys_ioctl+0x78/0xa8
__arm64_sys_ioctl+0x1c/0x28
el0_svc_common.constprop.0+0x90/0x168
el0_svc_handler+0x28/0x78
el0_svc+0x8/0xc
Fixes: 68337d0b8644 ("drm/panfrost: Restructure the GEM object creation")
Cc: Tomeu Vizoso <tomeu.vizoso@xxxxxxxxxxxxx>
Cc: David Airlie <airlied@xxxxxxxx>
Cc: Daniel Vetter <daniel@xxxxxxxx>
Signed-off-by: Rob Herring <robh@xxxxxxxxxx>
---
drivers/gpu/drm/panfrost/panfrost_gem.c | 10 ++++++----
1 file changed, 6 insertions(+), 4 deletions(-)
diff --git a/drivers/gpu/drm/panfrost/panfrost_gem.c b/drivers/gpu/drm/panfrost/panfrost_gem.c
index e084bc4e9083..acb07fe06580 100644
--- a/drivers/gpu/drm/panfrost/panfrost_gem.c
+++ b/drivers/gpu/drm/panfrost/panfrost_gem.c
@@ -65,16 +65,18 @@ static int panfrost_gem_open(struct drm_gem_object *obj, struct drm_file *file_p
spin_lock(&priv->mm_lock);
ret = drm_mm_insert_node_generic(&priv->mm, &bo->node,
size >> PAGE_SHIFT, align, color, 0);
+ spin_unlock(&priv->mm_lock);
if (ret)
- goto out;
+ return ret;
if (!bo->is_heap) {
ret = panfrost_mmu_map(bo);
- if (ret)
+ if (ret) {
+ spin_lock(&priv->mm_lock);
drm_mm_remove_node(&bo->node);
+ spin_unlock(&priv->mm_lock);
+ }
}
-out:
- spin_unlock(&priv->mm_lock);
return ret;
}
--
2.20.1
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