• Mikulas Patocka's avatar
    dm bufio: initialize read-only module parameters · d468a287
    Mikulas Patocka authored
    commit 4cb57ab4a2e61978f3a9b7d4f53988f30d61c27f upstream.
    Some module parameters in dm-bufio are read-only. These parameters
    inform the user about memory consumption. They are not supposed to be
    changed by the user.
    However, despite being read-only, these parameters can be set on
    modprobe or insmod command line, for example:
    modprobe dm-bufio current_allocated_bytes=12345
    The kernel doesn't expect that these variables can be non-zero at module
    initialization and if the user sets them, it results in BUG.
    This patch initializes the variables in the module init routine, so that
    user-supplied values are ignored.
    Signed-off-by: default avatarMikulas Patocka <mpatocka@redhat.com>
    Signed-off-by: default avatarMike Snitzer <snitzer@redhat.com>
    Signed-off-by: default avatarGreg Kroah-Hartman <gregkh@linuxfoundation.org>
dm-bufio.c 42.5 KB