On Thu, 22 Nov 2012 06:19:23 -0500
Jun Chen [off-list ref] wrote:

This patch add modem power off function in the reboot process
according registering reboot callback to the reboot_notifier_list.
Also realizing the spi shutdown function.

Need to unregister the reboot notifier in the ifx_spi_exit path. If the
driver module is unloaded you leave the callback present and the kernel
will call into freed memory.

Alan