hvc console sleep under spinlock

[Anton Blanchard]

Hi,

HVC console is calling copy_from_user inside a spinlock. Anyone want to
have a stab at fixing it?

Anton

Debug: sleeping function called from invalid context at include/asm/uaccess.h:225
in_atomic():1, irqs_disabled():1
Call Trace:
[c000000000052bc0] .__might_sleep+0xd8/0x120
[c000000000214f14] .hvc_write+0x10c/0x21c
[c00000000020180c] .write_chan+0x2e8/0x320
[c0000000001f9934] .tty_write+0x378/0x450
[c0000000000acedc] .vfs_write+0x10c/0x170
[c0000000000ad030] .sys_write+0x50/0xa0
[c000000000011894] .ret_from_syscall_1+0x0/0xa4

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