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POLL_TXQ_FULL temporarily disables shared_umem on TX to exercise the TX timeout path in isolation. With shared_umem enabled, TX setup expects RX UMEM to be initialized first and fails with: "RX UMEM is not initialized before shared-UMEM TX setup". Save and restore shared_umem around POLL_TXQ_FULL execution, and restore it on both success and pkt_stream_replace() failure paths. Also add an in-code comment explaining why shared_umem is temporarily disabled in this test. This keeps timeout setup local and prevents cross-test state leakage. Signed-off-by: Tushar Vyavahare <tushar.vyavahare@intel.com> Reviewed-by: Jason Xing <kerneljasonxing@gmail.com> Acked-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Tested-by: Maciej Fijalkowski <maciej.fijalkowski@intel.com> Link: https://patch.msgid.link/20260616154955.1492560-4-tushar.vyavahare@intel.com Signed-off-by: Jakub Kicinski <kuba@kernel.org>