diff options
| author | Muhammad Hamza Farooq <mfarooq@visteon.com> | 2015-09-18 14:08:31 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2015-10-04 19:36:10 +0300 |
| commit | 3b963042b64f5de3c63a1ebcbe2cad6b1597b8b9 (patch) | |
| tree | d4c46ca508d6382e87af00246de0fa762d9aeec0 /drivers | |
| parent | 1d3db608f933605d2dce44a0262ea94da3407465 (diff) | |
| download | linux-3b963042b64f5de3c63a1ebcbe2cad6b1597b8b9.tar.xz | |
serial: sh-sci: Do not terminate DMA engine when race condition occurs
When DMA packet completion and timer expiry take place at the same time,
do not terminate the DMA engine, leading by submission of new
descriptors, as the DMA communication hasn't necessarily stopped here.
Signed-off-by: Muhammad Hamza Farooq <mfarooq@visteon.com>
Signed-off-by: Geert Uytterhoeven <geert+renesas@glider.be>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 7 |
1 files changed, 6 insertions, 1 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 84c15152e111..9406fe227bc7 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1296,9 +1296,14 @@ static void rx_timer_fn(unsigned long arg) } status = dmaengine_tx_status(s->chan_rx, s->active_rx, &state); - if (status == DMA_COMPLETE) + if (status == DMA_COMPLETE) { 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; + } /* Handle incomplete DMA receive */ dmaengine_terminate_all(s->chan_rx); |