drm/i915: remove questionable fence optimization during copy
First of all as discussed multiple times now kernel copies *must* always wait for all fences in a BO before actually doing the copy. This is mandatory. Additional to that drop the handling when there can't be a shared slot allocated on the source BO and just properly return an error code. Otherwise this code path would only be tested under out of memory conditions. Signed-off-by: Christian König <christian.koenig@amd.com> Reviewed-by: Thomas Hellström <thomas.hellstrom@linux.intel.com> Link: https://patchwork.freedesktop.org/patch/msgid/20211221200050.436316-3-thomas.hellstrom@linux.intel.comSigned-off-by: Thomas Hellström <thomas.hellstrom@linux.intel.com>
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