gallium/winsys/kms: Look up the GEM handle after importing a prime FD
drmPrimeHandleToFD() will return the same GEM handle every time the same buffer is imported, even from a different prime FD. Since GEM handles are not reference counted, we need to make sure that each GEM handle is referenced only by one display target struct, by looking it up in kms_sw->bo_list first and bumping the refcount of the found dt on hit and falling back to creating a new dt only on miss. v2: Split into separate function. Use helper function for lookup. v3 [Emil Velikov]: Rename kms_sw_displaytarget_{lookup,find_and_ref} (Jordan) Signed-off-by: Tomasz Figa <tfiga@chromium.org> CC: <mesa-stable@lists.freedesktop.org> Reviewed-by: Hans de Goede <hdegoede@redhat.com> (v2) Signed-off-by: Emil Velikov <emil.velikov@collabora.com>
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@ -244,6 +244,10 @@ kms_sw_displaytarget_add_from_prime(struct kms_sw_winsys *kms_sw, int fd,
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if (ret)
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return NULL;
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kms_sw_dt = kms_sw_displaytarget_find_and_ref(kms_sw, handle);
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if (kms_sw_dt)
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return kms_sw_dt;
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kms_sw_dt = CALLOC_STRUCT(kms_sw_displaytarget);
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if (!kms_sw_dt)
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return NULL;
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