Commit 3f001711 authored Jan 10, 2010 by Atsushi Nemoto Committed by Greg Kroah-Hartman Jan 20, 2010

compat_ioctl: Supress "unknown cmd" message on serial /dev/console



After the commit fb07a5f8 ("compat_ioctl: remove all VT ioctl
handling"), I got this error message on 64-bit mips kernel with 32-bit
busybox userland:

ioctl32(init:1): Unknown cmd fd(0) cmd(00005600){t:'V';sz:0} arg(7fd76480) on /dev/console

The cmd 5600 is VT_OPENQRY.  The busybox's init issues this ioctl to
know vt-console or serial-console.  If the console was serial console,
VT ioctls are not handled by the serial driver.

And by quick search, I found some programs using VT_GETMODE to check
vt-console is available or not.

Signed-off-by: Atsushi Nemoto <anemo@mba.ocn.ne.jp>
Cc: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>

parent 24bc7347

fs/compat_ioctl.c

+3 −0

Original line number	Diff line number	Diff line
		@@ -1005,6 +1005,9 @@ COMPATIBLE_IOCTL(SCSI_IOCTL_SEND_COMMAND)
		COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
		COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
		#endif
		/* Big V (don't complain on serial console) */
		IGNORE_IOCTL(VT_OPENQRY)
		IGNORE_IOCTL(VT_GETMODE)
		/* Little p (/dev/rtc, /dev/envctrl, etc.) */
		COMPATIBLE_IOCTL(RTC_AIE_ON)
		COMPATIBLE_IOCTL(RTC_AIE_OFF)

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