diff options
| -rw-r--r-- | drivers/usb/musb/musb_debugfs.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/drivers/usb/musb/musb_debugfs.c b/drivers/usb/musb/musb_debugfs.c index 78a283e9ce40..04382ec31d3f 100644 --- a/drivers/usb/musb/musb_debugfs.c +++ b/drivers/usb/musb/musb_debugfs.c @@ -191,9 +191,16 @@ static ssize_t musb_test_mode_write(struct file *file, { struct seq_file *s = file->private_data; struct musb *musb = s->private; - u8 test = 0; + u8 test; char buf[18]; + test = musb_readb(musb->mregs, MUSB_TESTMODE); + if (test) { + dev_err(musb->controller, "Error: test mode is already set. " + "Please do USB Bus Reset to start a new test.\n"); + return count; + } + memset(buf, 0x00, sizeof(buf)); if (copy_from_user(buf, ubuf, min_t(size_t, sizeof(buf) - 1, count))) |