I've just been looking through the remaining cruft in the serial
drivers, and have come across this silly thing:
TIOCGICOUNT exports a structure to userspace called
struct serial_icounter_struct.
However, sh, sh64 and xtensa do this:
include/asm-sh/ioctls.h:#define TIOCGICOUNT _IOR('T', 93, struct async_icount) /* 0x545D */ /* read serial port inline interrupt counts */
include/asm-sh64/ioctls.h:#define TIOCGICOUNT 0x802c545d /* _IOR('T', 93, struct async_icount) 0x545D */ /* read serial port inline interrupt counts */
include/asm-xtensa/ioctls.h:#define TIOCGICOUNT _IOR('T', 93, struct async_icount) /* read serial port inline interrupt counts */
What's more is that no driver actually exports async_icount, and
async_icount is a kernel internal structure which does _not_ form
part of the public API, and modifications to this will result in
unexpected breakage on these platforms.
100% for trying to clean up the tty ioctl definitions. 0% for
using the wrong structures. As such, these _require_ fixing.
Please document that your TIOCGICOUNT is broken and remove the
dependence on the async_icount structure. Thanks.
--
Russell King
Linux kernel 2.6 ARM Linux - http://www.arm.linux.org.uk/
maintainer of: 2.6 Serial core
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