This loop is supposed to loop until if reads something other than
CS_IDST or until it times out after 30,000 attempts.  But because of
the || vs && bug, it will never time out and instead it will loop a
minimum of 30,000 times.

This bug is quite old but the code is only used in USB_DEVICE_TEST_MODE
so it probably doesn't affect regular usage.

Fixes: 96fe53ef ("usb: gadget: r8a66597-udc: add support for TEST_MODE")
Cc: stable <stable@vger.kernel.org>
Reviewed-by: Yoshihiro Shimoda <yoshihiro.shimoda.uh@renesas.com>
Acked-by: Felipe Balbi <balbi@kernel.org>
Signed-off-by: Dan Carpenter <dan.carpenter@oracle.com>
Link: https://lore.kernel.org/r/20210906094221.GA10957@kiliSigned-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>