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[ Upstream commit 0f0d2c876c96d4908a9ef40959a44bec21bdd6cf ] If Doorbell Buffer Config command fails even 'dev->dbbuf_dbs != NULL' which means OACS indicates that NVME_CTRL_OACS_DBBUF_SUPP is set, nvme_dbbuf_update_and_check_event() will check event even it's not been successfully set. This patch fixes mismatch among dbbuf for sq/cqs in case that dbbuf command fails. Signed-off-by: Minwoo Im <minwoo.im.dev@gmail.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>