[BUG] tpm2_tis_mmio driver crashes on device_remove()

[Heinrich Schuchardt]

Hello Ilias,

I have compiled qemu_arm64_defconfig with CONFIG_CMD_EFIDEBUG=y and 
CONFIG_CMD_UNBIND.

When I execute the commands

    efidebug dh
    unbind tpm 0

a crash occurs in tpm_tis_ready().

tpm_tis_remove() calls iounmmap() before calling tpm_tis_cleanup() which 
invokes tpm_tis_ready(). tpm_tis_ready() writes to the unmapped IO.

You should not unmap the IO region before accessing it in 
tpm_tis_ready(). But swapping these calls is not enough to fix the problem.

Best regards

Heinrich