dma-debug: Cleanup for copy-loop in filter_write()

Earlier in this function we set the last byte of "buf" to NULL so we
always hit the break statement and "i" is never equal to NAME_MAX_LEN.
This patch doesn't change how the driver works but it silences a Smatch
warning and it makes it clearer that we don't write past the end of the
array.

Signed-off-by: Dan Carpenter <error27@gmail.com>
Signed-off-by: Joerg Roedel <joerg.roedel@amd.com>

diff --git a/lib/dma-debug.c b/lib/dma-debug.c
index ba8b670..01e6427 100644 (file)
--- a/lib/dma-debug.c
+++ b/lib/dma-debug.c
@@ -570,7 +570,7 @@ static ssize_t filter_write(struct file *file, const char __user *userbuf,
         * Now parse out the first token and use it as the name for the
         * driver to filter for.
         */
-       for (i = 0; i < NAME_MAX_LEN; ++i) {
+       for (i = 0; i < NAME_MAX_LEN - 1; ++i) {
                current_driver_name[i] = buf[i];
                if (isspace(buf[i]) || buf[i] == ' ' || buf[i] == 0)
                        break;