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Register backup function can be called from atomic context. Instead of using atomic memory pool, embed backup storage space in struct dwc2_hsotg. Also add a valid flag in each struct as NULL pointer can't be used as the content validity check any more. Acked-by: John Youn <[email protected]> Tested-by: Heiko Stuebner <[email protected]> Tested-by: Doug Anderson <[email protected]> Signed-off-by: Mian Yousaf Kaukab <[email protected]> Signed-off-by: Felipe Balbi <[email protected]>