Commit 3f00171125384b46e5088b7d7a5d0b3e6972f1ee

Authored by Atsushi Nemoto
Committed by Greg Kroah-Hartman
1 parent 24bc7347da

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>

Showing 1 changed file with 3 additions and 0 deletions Side-by-side Diff

... ... @@ -1005,6 +1005,9 @@
1005 1005 COMPATIBLE_IOCTL(SCSI_IOCTL_PROBE_HOST)
1006 1006 COMPATIBLE_IOCTL(SCSI_IOCTL_GET_PCI)
1007 1007 #endif
  1008 +/* Big V (don't complain on serial console) */
  1009 +IGNORE_IOCTL(VT_OPENQRY)
  1010 +IGNORE_IOCTL(VT_GETMODE)
1008 1011 /* Little p (/dev/rtc, /dev/envctrl, etc.) */
1009 1012 COMPATIBLE_IOCTL(RTC_AIE_ON)
1010 1013 COMPATIBLE_IOCTL(RTC_AIE_OFF)