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serial: sh-sci: Fix deadlock caused by serial output request

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While spin is already locked, serial output request causes the deadlock,
because serial output process also tries to lock the spin.
This patch removes serial output with spin locked.

Signed-off-by: Takatoshi Akiyama <[email protected]>
Signed-off-by: Takeshi Kihara <[email protected]>
Signed-off-by: Simon Horman <[email protected]>
Reviewed-by: Geert Uytterhoeven <[email protected]>
Acked-by: Wolfram Sang <[email protected]>
Signed-off-by: Greg Kroah-Hartman <[email protected]>
This commit is contained in:
Takatoshi Akiyama 2016-11-07 16:56:50 +01:00 • committed by Greg Kroah-Hartman
commit 6fc5a52042
1 changed files with 5 additions and 15 deletions
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20
drivers/tty/serial/sh-sci.c
View file

@ -1142,11 +1142,8 @@ static int sci_dma_rx_push(struct sci_port *s, void *buf, size_t count)
int copied;
copied = tty_insert_flip_string(tport, buf, count);
if (copied < count) {
dev_warn(port->dev, "Rx overrun: dropping %zu bytes\n",
count - copied);
if (copied < count)
port->icount.buf_overrun++;
}
port->icount.rx += copied;
@ -1161,8 +1158,6 @@ static int sci_dma_rx_find_active(struct sci_port *s)
if (s->active_rx == s->cookie_rx[i])
return i;
dev_err(s->port.dev, "%s: Rx cookie %d not found!\n", __func__,
s->active_rx);
return -1;
}
@ -1223,9 +1218,9 @@ static void sci_dma_rx_complete(void *arg)
dma_async_issue_pending(chan);
spin_unlock_irqrestore(&port->lock, flags);
dev_dbg(port->dev, "%s: cookie %d #%d, new active cookie %d\n",
__func__, s->cookie_rx[active], active, s->active_rx);
spin_unlock_irqrestore(&port->lock, flags);
return;
fail:
@ -1273,8 +1268,6 @@ static void sci_submit_rx(struct sci_port *s)
if (dma_submit_error(s->cookie_rx[i]))
goto fail;
dev_dbg(s->port.dev, "%s(): cookie %d to #%d\n", __func__,
s->cookie_rx[i], i);
}
s->active_rx = s->cookie_rx[0];
@ -1288,7 +1281,6 @@ fail:
for (i = 0; i < 2; i++)
s->cookie_rx[i] = -EINVAL;
s->active_rx = -EINVAL;
dev_warn(s->port.dev, "Failed to re-start Rx DMA, using PIO\n");
sci_rx_dma_release(s, true);
}
@ -1358,10 +1350,10 @@ static void rx_timer_fn(unsigned long arg)
int active, count;
u16 scr;
spin_lock_irqsave(&port->lock, flags);
dev_dbg(port->dev, "DMA Rx timed out\n");
spin_lock_irqsave(&port->lock, flags);
active = sci_dma_rx_find_active(s);
if (active < 0) {
spin_unlock_irqrestore(&port->lock, flags);
@ -1370,9 +1362,9 @@ static void rx_timer_fn(unsigned long arg)
status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state);
if (status == DMA_COMPLETE) {
spin_unlock_irqrestore(&port->lock, flags);
dev_dbg(port->dev, "Cookie %d #%d has already completed\n",
s->active_rx, active);
spin_unlock_irqrestore(&port->lock, flags);
/* Let packet complete handler take care of the packet */
return;
@ -1396,8 +1388,6 @@ static void rx_timer_fn(unsigned long arg)
/* Handle incomplete DMA receive */
dmaengine_terminate_all(s->chan_rx);
read = sg_dma_len(&s->sg_rx[active]) - state.residue;
dev_dbg(port->dev, "Read %u bytes with cookie %d\n", read,
s->active_rx);
if (read) {
count = sci_dma_rx_push(s, s->rx_buf[active], read);