Removing Spin Locks in ARM MXC GPIOs

[rpkamiak at rockwellcollins.com]

I'll make this quick.
Should the GPIO functions in gpio.c (i.e. mxc_gpio_set) perform a 
spin_lock prior to performing a read modify write operation on GPIO 
registers ?  They were removed somewhere between 2.6.22(imx31pdk-rel5) and 
2.6.31(imx35pdk-rel8). 

Thanks
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