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    Subject[PATCH 5.10 096/104] vt_ioctl: Revert VT_RESIZEX parameter handling removal
    Date
    From: Maciej W. Rozycki <macro@orcam.me.uk>

    commit a90c275eb144c1b755f04769e1f29d832d6daeaf upstream.

    Revert the removal of code handling extra VT_RESIZEX ioctl's parameters
    beyond those that VT_RESIZE supports, fixing a functional regression
    causing `svgatextmode' not to resize the VT anymore.

    As a consequence of the reverted change when the video adapter is
    reprogrammed from the original say 80x25 text mode using a 9x16
    character cell (720x400 pixel resolution) to say 80x37 text mode and the
    same character cell (720x592 pixel resolution), the VT geometry does not
    get updated and only upper two thirds of the screen are used for the VT,
    and the lower part remains blank. The proportions change according to
    text mode geometries chosen.

    Revert the change verbatim then, bringing back previous VT resizing.

    Signed-off-by: Maciej W. Rozycki <macro@orcam.me.uk>
    Fixes: 988d0763361b ("vt_ioctl: make VT_RESIZEX behave like VT_RESIZE")
    Cc: stable@vger.kernel.org # v5.10+
    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
    Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
    ---
    drivers/tty/vt/vt_ioctl.c | 57 +++++++++++++++++++++++++++++++++++++---------
    1 file changed, 47 insertions(+), 10 deletions(-)

    --- a/drivers/tty/vt/vt_ioctl.c
    +++ b/drivers/tty/vt/vt_ioctl.c
    @@ -771,21 +771,58 @@ static int vt_resizex(struct vc_data *vc
    if (copy_from_user(&v, cs, sizeof(struct vt_consize)))
    return -EFAULT;

    - if (v.v_vlin)
    - pr_info_once("\"struct vt_consize\"->v_vlin is ignored. Please report if you need this.\n");
    - if (v.v_clin)
    - pr_info_once("\"struct vt_consize\"->v_clin is ignored. Please report if you need this.\n");
    + /* FIXME: Should check the copies properly */
    + if (!v.v_vlin)
    + v.v_vlin = vc->vc_scan_lines;
    +
    + if (v.v_clin) {
    + int rows = v.v_vlin / v.v_clin;
    + if (v.v_rows != rows) {
    + if (v.v_rows) /* Parameters don't add up */
    + return -EINVAL;
    + v.v_rows = rows;
    + }
    + }
    +
    + if (v.v_vcol && v.v_ccol) {
    + int cols = v.v_vcol / v.v_ccol;
    + if (v.v_cols != cols) {
    + if (v.v_cols)
    + return -EINVAL;
    + v.v_cols = cols;
    + }
    + }
    +
    + if (v.v_clin > 32)
    + return -EINVAL;

    - console_lock();
    for (i = 0; i < MAX_NR_CONSOLES; i++) {
    - vc = vc_cons[i].d;
    + struct vc_data *vcp;
    +
    + if (!vc_cons[i].d)
    + continue;
    + console_lock();
    + vcp = vc_cons[i].d;
    + if (vcp) {
    + int ret;
    + int save_scan_lines = vcp->vc_scan_lines;
    + int save_font_height = vcp->vc_font.height;

    - if (vc) {
    - vc->vc_resize_user = 1;
    - vc_resize(vc, v.v_cols, v.v_rows);
    + if (v.v_vlin)
    + vcp->vc_scan_lines = v.v_vlin;
    + if (v.v_clin)
    + vcp->vc_font.height = v.v_clin;
    + vcp->vc_resize_user = 1;
    + ret = vc_resize(vcp, v.v_cols, v.v_rows);
    + if (ret) {
    + vcp->vc_scan_lines = save_scan_lines;
    + vcp->vc_font.height = save_font_height;
    + console_unlock();
    + return ret;
    + }
    }
    + console_unlock();
    }
    - console_unlock();

    return 0;
    }

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