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The variable 'dw_mci_card_workqueue' is a global variable shared between multiple instances of the dw_mmc host controller. Due to this, data corruption has been noticed when multiple instances of dw_mmc controllers are actively reading/writing the media. Fix this by adding a instance of 'struct workqueue_struct' for each host instance and removing the global 'dw_mci_card_workqueue' instance. Signed-off-by: Thomas Abraham <thomas.abraham@linaro.org> Acked-by: Jaehoon Chung <jh80.chung@samsung.com> Acked-by: Will Newton <will.newton@imgtec.com> Signed-off-by: Chris Ball <cjb@laptop.org>