serial: sh-sci: fix a race of DMA submit_tx on transfer

When DMA is enabled, sh-sci transfer begins with
 uart_start()
  sci_start_tx()
    if (cookie_tx < 0) schedule_work()
Then, starts DMA when wq scheduled, -- (A)
 process_one_work()
  work_fn_rx()
   cookie_tx = desc->submit_tx()
And finishes when DMA transfer ends, -- (B)
 sci_dma_tx_complete()
  async_tx_ack()
  cookie_tx = -EINVAL
  (possible another schedule_work())

This A to B sequence is not reentrant, since controlling variables
(for example, cookie_tx above) are not queues nor lists. So, they
must be invoked as A B A B..., otherwise results in kernel crash.

To ensure the sequence, sci_start_tx() seems to test if cookie_tx < 0
(represents "not used") to call schedule_work().
But cookie_tx will not be set (to a cookie, also means "used") until
in the middle of work queue scheduled function work_fn_tx().

This gap between the test and set allows the breakage of the sequence
under the very frequently call of uart_start().
Another gap between async_tx_ack() and another schedule_work() results
in the same issue, too.

This patch introduces a new condition "cookie_tx == 0" just to mark
it is "busy" and assign it within spin-locked region to fill the gaps.

Signed-off-by: Takashi Yoshii <takashi.yoshii.zj@renesas.com>
Reviewed-by: Guennadi Liakhovetski <g.liakhovetski@gmx.de>
Cc: stable@vger.kernel.org
Signed-off-by: Paul Mundt <lethal@linux-sh.org>

1 files changed, 10 insertions, 5 deletions

diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c
index 61b7fd2729cd..9ec6d4e7d9e5 100644
--- a/drivers/tty/serial/sh-sci.c
+++ b/drivers/tty/serial/sh-sci.c
@@ -1229,17 +1229,20 @@ static void sci_dma_tx_complete(void *arg)
         port->icount.tx += sg_dma_len(&s->sg_tx);
 
         async_tx_ack(s->desc_tx);
-        s->cookie_tx = -EINVAL;
         s->desc_tx = NULL;
 
         if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
                 uart_write_wakeup(port);
 
         if (!uart_circ_empty(xmit)) {
+                s->cookie_tx = 0;
                 schedule_work(&s->work_tx);
-        } else if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
-                u16 ctrl = sci_in(port, SCSCR);
-                sci_out(port, SCSCR, ctrl & ~SCSCR_TIE);
+        } else {
+                s->cookie_tx = -EINVAL;
+                if (port->type == PORT_SCIFA || port->type == PORT_SCIFB) {
+                        u16 ctrl = sci_in(port, SCSCR);
+                        sci_out(port, SCSCR, ctrl & ~SCSCR_TIE);
+                }
         }
 
         spin_unlock_irqrestore(&port->lock, flags);
@@ -1501,8 +1504,10 @@ static void sci_start_tx(struct uart_port *port)
         }
 
         if (s->chan_tx && !uart_circ_empty(&s->port.state->xmit) &&
-            s->cookie_tx < 0)
+            s->cookie_tx < 0) {
+                s->cookie_tx = 0;
                 schedule_work(&s->work_tx);
+        }
 #endif
 
         if (!s->chan_tx || port->type == PORT_SCIFA || port->type == PORT_SCIFB) {