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[ Upstream commit26e6775f75] Add the check for the return value of the create_singlethread_workqueue() in order to avoid NULL pointer dereference. Fixes:b481de9ca0("[IWLWIFI]: add iwlwifi wireless drivers") Signed-off-by: Jiasheng Jiang <jiasheng@iscas.ac.cn> Acked-by: Stanislaw Gruszka <stf_xl@wp.pl> Signed-off-by: Kalle Valo <kvalo@kernel.org> Link: https://lore.kernel.org/r/20230209010748.45454-1-jiasheng@iscas.ac.cn Signed-off-by: Sasha Levin <sashal@kernel.org>