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| author | Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com> | 2015-08-21 18:02:49 (GMT) |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 16:33:48 (GMT) |
| commit | 0907c1004f9bbe5bda0d3d2be46520b729de5c1d (patch) | |
| tree | 095421f52f255dca2da0d4fcdd4598900f1fd14a /drivers/tty/serial/sh-sci.c | |
| parent | 47aceb927fffa77b0328b6fde846a6b2182dad01 (diff) | |
| download | linux-0907c1004f9bbe5bda0d3d2be46520b729de5c1d.tar.xz | |
serial: sh-sci: Fix exclusion of work_fn_rx and sci_dma_rx_complete
There is a problem when the sci_dma_rx_complete() is processed
before cancel process of work_fn_rx() completes by rx_timer_fn().
This patch locks work_fn_rx().
Signed-off-by: Kazuya Mizuguchi <kazuya.mizuguchi.ks@renesas.com>
Signed-off-by: Yoshihiro Kaneko <ykaneko0929@gmail.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty/serial/sh-sci.c')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 12 |
1 files changed, 7 insertions, 5 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index e318f00..f6ed203 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1433,8 +1433,10 @@ static void work_fn_rx(struct work_struct *work) struct dma_async_tx_descriptor *desc; struct dma_tx_state state; enum dma_status status; + unsigned long flags; int new; + spin_lock_irqsave(&port->lock, flags); if (s->active_rx == s->cookie_rx[0]) { new = 0; } else if (s->active_rx == s->cookie_rx[1]) { @@ -1442,14 +1444,13 @@ static void work_fn_rx(struct work_struct *work) } else { dev_err(port->dev, "%s: Rx cookie %d not found!\n", __func__, s->active_rx); - return; + goto out; } status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); if (status != DMA_COMPLETE) { /* Handle incomplete DMA receive */ struct dma_chan *chan = s->chan_rx; - unsigned long flags; unsigned int read; int count; @@ -1458,16 +1459,14 @@ static void work_fn_rx(struct work_struct *work) dev_dbg(port->dev, "Read %u bytes with cookie %d\n", read, s->active_rx); - spin_lock_irqsave(&port->lock, flags); count = sci_dma_rx_push(s, read); - spin_unlock_irqrestore(&port->lock, flags); if (count) tty_flip_buffer_push(&port->state->port); sci_submit_rx(s); - return; + goto out; } desc = dmaengine_prep_slave_sg(s->chan_rx, &s->sg_rx[new], 1, @@ -1486,11 +1485,14 @@ static void work_fn_rx(struct work_struct *work) dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n", __func__, s->cookie_rx[new], new, s->active_rx); +out: + spin_unlock_irqrestore(&port->lock, flags); return; fail: dev_warn(port->dev, "Failed submitting Rx DMA descriptor\n"); sci_rx_dma_release(s, true); + spin_unlock_irqrestore(&port->lock, flags); } static void work_fn_tx(struct work_struct *work) |