usb: early: xhci-dbc: Optimize early_xdbc_write()

There is no point in zeroing 'buf'.
It would be cleared only once, and if the 'while' loop is executed several
times, all but the first run would have a 'dirty' buffer.
Moreover, the size of the chunk is computed in the loop and this size is
passed to xdbc_bulk_write().

So remove this useless memset().

Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
Link: https://lore.kernel.org/r/687bbcd940c59fbddd0e3a8b578fd3422962e50f.1675016180.git.christophe.jaillet@wanadoo.fr
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/usb/early/xhci-dbc.c b/drivers/usb/early/xhci-dbc.c
index f3e23be227d41752304018fd7d6775424d36d83d..965a24e47c0f59c991bdc05590bf4f4eec3e060e 100644 (file)
--- a/drivers/usb/early/xhci-dbc.c
+++ b/drivers/usb/early/xhci-dbc.c
@@ -881,7 +881,7 @@ static void early_xdbc_write(struct console *con, const char *str, u32 n)
 
        if (!xdbc.xdbc_reg)
                return;
-       memset(buf, 0, XDBC_MAX_PACKET);
+
        while (n > 0) {
                for (chunk = 0; chunk < XDBC_MAX_PACKET && n > 0; str++, chunk++, n--) {