wayland/drm_syncobj: Allow temporarily close the device#2025
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| /// Note: Any existing timeline objects will error out and hang clients, | ||
| /// until `update_device` is called with a new device fd. |
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Well, if we use post_error, that won't just hang the client, it will cause the client to crash when its Wayland connection is broken by the protocol error, right?
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libseatrecommends to re-open file descriptors after suspend/resume, since they might have been permanently revoked.Unfortunately it doesn't wire-up logind's resume event, which provides new file descriptors, to pass those on. As a result compositors need to issue a new open-call, which will not succeed unless the old file descriptor has been closed.
Since we put the
DrmDeviceFdinto internalArcs (yes multiple), this can be a bit annoying and one part where we completely fail to provide a way to re-open the FD is ourdrm_syncobj-protocol implementation.You can update the internal device in case it disappears and you want to select a new one. But if you simply want to re-open the file descriptor, there is no way to do that without invalidating all existing timelines in the process (which is obviously bad and will hang some clients due to unsignaled release points).
There isn't really an elegant way to do this, so this PR provides a way to temporarily close the internal file descriptor of the global's state.
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