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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>
This commit is contained in:
Kazuya Mizuguchi 2015-08-21 20:02:49 +02:00 committed by Greg Kroah-Hartman
parent 47aceb927f
commit 0907c1004f
1 changed files with 7 additions and 5 deletions
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12
drivers/tty/serial/sh-sci.c
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@ -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)