diff mbox series

[04/11] drm/i915: Drop code to handle set-vm races from execbuf

Message ID 20210902142057.929669-4-daniel.vetter@ffwll.ch (mailing list archive)
State New, archived
Headers show
Series [01/11] drm/i915: Release i915_gem_context from a worker | expand

Commit Message

Daniel Vetter Sept. 2, 2021, 2:20 p.m. UTC 
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 <maarten.lankhorst@linux.intel.com>
References: ccbc1b97948a ("drm/i915/gem: Don't allow changing the VM on running contexts (v4)")
Signed-off-by: Daniel Vetter <daniel.vetter@intel.com>
Cc: Jon Bloomfield <jon.bloomfield@intel.com>
Cc: Chris Wilson <chris@chris-wilson.co.uk>
Cc: Maarten Lankhorst <maarten.lankhorst@linux.intel.com>
Cc: Joonas Lahtinen <joonas.lahtinen@linux.intel.com>
Cc: Daniel Vetter <daniel.vetter@ffwll.ch>
Cc: "Thomas Hellström" <thomas.hellstrom@linux.intel.com>
Cc: Matthew Auld <matthew.auld@intel.com>
Cc: Lionel Landwerlin <lionel.g.landwerlin@intel.com>
Cc: Dave Airlie <airlied@redhat.com>
Cc: Jason Ekstrand <jason@jlekstrand.net>
---
 drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c | 6 +-----
 1 file changed, 1 insertion(+), 5 deletions(-)
diff mbox series

Patch

diff --git a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
index e809aca00f72..905b1cbd22d5 100644
--- a/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
+++ b/drivers/gpu/drm/i915/gem/i915_gem_execbuffer.c
@@ -775,11 +775,7 @@  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;