mxser: alloc only needed # of ports

Many boards have only 2 ports. But we always allocate 8 ports (struct
mxser_port) in each struct mxser_board.

Switch this to an empty/variable sized array ([]) and allocate the
needed number of ports using struct_size helper in ->probe.

Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Link: https://lore.kernel.org/r/20210618061516.662-54-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/mxser.c b/drivers/tty/mxser.c
index 0e99225e260fb1299546d3ac647f4207bfd18cf7..81e2b72fca3f33e1df15d51d09f81499275cd871 100644 (file)
--- a/drivers/tty/mxser.c
+++ b/drivers/tty/mxser.c
@@ -275,7 +275,7 @@ struct mxser_board {
        enum mxser_must_hwid must_hwid;
        speed_t max_baud;
 
-       struct mxser_port ports[MXSER_PORTS_PER_BOARD];
+       struct mxser_port ports[];
 };
 
 static DECLARE_BITMAP(mxser_boards, MXSER_BOARDS);
@@ -1923,7 +1923,8 @@ static int mxser_probe(struct pci_dev *pdev,
                goto err;
        }
 
-       brd = devm_kzalloc(&pdev->dev, sizeof(*brd), GFP_KERNEL);
+       brd = devm_kzalloc(&pdev->dev, struct_size(brd, ports, nports),
+                       GFP_KERNEL);
        if (!brd)
                goto err;