drm/i915: Drop code to handle set-vm races from execbuf

Changing the vm from a finalized gem ctx is no longer possible, which
means we don't have to check for that anymore.

I was pondering whether to keep the check as a WARN_ON, but things go
boom real bad real fast if the vm of a vma is wrong. Plus we'd need to
also get the ggtt vm for !full-ppgtt platforms. Ditching it all seemed
like a better idea.

Reviewed-by: Maarten Lankhorst <[email protected]>
References: ccbc1b97948a ("drm/i915/gem: Don't allow changing the VM on running contexts (v4)")
Signed-off-by: Daniel Vetter <[email protected]>
Cc: Jon Bloomfield <[email protected]>
Cc: Chris Wilson <[email protected]>
Cc: Maarten Lankhorst <[email protected]>
Cc: Joonas Lahtinen <[email protected]>
Cc: Daniel Vetter <[email protected]>
Cc: "Thomas Hellström" <[email protected]>
Cc: Matthew Auld <[email protected]>
Cc: Lionel Landwerlin <[email protected]>
Cc: Dave Airlie <[email protected]>
Cc: Jason Ekstrand <[email protected]>
Link: https://patchwork.freedesktop.org/patch/msgid/[email protected]

1 files changed, 1 insertions, 5 deletions

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index 45bc4e4ff048..4816359c4c21 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -759,11 +759,7 @@ static int __eb_add_lut(struct i915_execbuffer *eb,
 	/* Check that the context hasn't been closed in the meantime */
 	err = -EINTR;
 	if (!mutex_lock_interruptible(&ctx->lut_mutex)) {
-		struct i915_address_space *vm = rcu_access_pointer(ctx->vm);
-
-		if (unlikely(vm && vma->vm != vm))
-			err = -EAGAIN; /* user racing with ctx set-vm */
-		else if (likely(!i915_gem_context_is_closed(ctx)))
+		if (likely(!i915_gem_context_is_closed(ctx)))
 			err = radix_tree_insert(&ctx->handles_vma, handle, vma);
 		else
 			err = -ENOENT;