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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 <[email protected]> Acked-by: Jaehoon Chung <[email protected]> Acked-by: Will Newton <[email protected]> Signed-off-by: Chris Ball <[email protected]>