compat_ioctl: fix FIONREAD on devices
authorArnd Bergmann <arnd@arndb.de>
Fri, 7 Feb 2020 16:55:48 +0000 (17:55 +0100)
committerArnd Bergmann <arnd@arndb.de>
Sat, 8 Feb 2020 17:02:54 +0000 (18:02 +0100)
commit0a061743af93f472687b8c69b0d539d1f12f3fd2
tree3170c2624e96172f2dffa1622bdab8369e88a83b
parent77b9040195dea3fcddf19e136c9e99a501351778
compat_ioctl: fix FIONREAD on devices

My final cleanup patch for sys_compat_ioctl() introduced a regression on
the FIONREAD ioctl command, which is used for both regular and special
files, but only works on regular files after my patch, as I had missed
the warning that Al Viro put into a comment right above it.

Change it back so it can work on any file again by moving the implementation
to do_vfs_ioctl() instead.

Fixes: 77b9040195de ("compat_ioctl: simplify the implementation")
Reported-and-tested-by: Christian Zigotzky <chzigotzky@xenosoft.de>
Reported-and-tested-by: youling257 <youling257@gmail.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
fs/ioctl.c