nvme: move reset workqueue handling to common code
This moves the nvme_reset function from the PCIe driver to common code, renaming it to nvme_reset_ctrl in the process. Additionally a new helper nvme_reset_ctrl_sync is added for the case where we want to wait for the reset. To facilitate that the reset_work work structure is move to the common nvme_ctrl structure and the ->reset_ctrl method is removed. For now the drivers initialize the reset_work with their own callback, but longer term we should move to callouts for specific parts of the reset process and move even more code to the core. Signed-off-by: NChristoph Hellwig <hch@lst.de> Reviewed-by: NSagi Grimberg <sagi@grimberg.me>
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