• Yadi.hu's avatar
    i2c-eg20t: fix race between i2c init and interrupt enable · 371a0153
    Yadi.hu authored
    
    
    the eg20t driver call request_irq() function before the pch_base_address,
    base address of i2c controller's register, is assigned an effective value.
    
    there is one possible scenario that an interrupt which isn't inside eg20t
    arrives immediately after request_irq() is executed when i2c controller
    shares an interrupt number with others. since the interrupt handler
    pch_i2c_handler() has already active as shared action, it will be called
    and read its own register to determine if this interrupt is from itself.
    
    At that moment, since base address of i2c registers is not remapped
    in kernel space yet,so the INT handler will access an illegal address
    and then a error occurs.
    
    Signed-off-by: default avatarYadi.hu <yadi.hu@windriver.com>
    Signed-off-by: default avatarWolfram Sang <wsa@the-dreams.de>
    Cc: stable@kernel.org
    371a0153