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fix this bug: Unable to handle kernel NULL pointer dereference at virtual address 00000000 PC is at __mutex_lock_slowpath+0x4c/0x154 LR is at mma8452_get_data+0x1fc/0x238 [<c07e4f2c>] (__mutex_lock_slowpath+0x4c/0x154) from [<c066d9c4>] (mma8452_get_data+0x1fc/0x238) [<c066d9c4>] (mma8452_get_data+0x1fc/0x238) from [<c066da10>] (mma8452_delaywork_func+0x10/0x30) [<c066da10>] (mma8452_delaywork_func+0x10/0x30) from [<c0466600>] (process_one_work+0x258/0x3ac) [<c0466600>] (process_one_work+0x258/0x3ac) from [<c0468f60>] (worker_thread+0x238/0x440) [<c0468f60>] (worker_thread+0x238/0x440) from [<c046c9ac>] (kthread+0x80/0x88) [<c046c9ac>] (kthread+0x80/0x88) from [<c0433190>] (kernel_thread_exit+0x0/0x8)