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| author |  Wolfram Sang <wsa+renesas@sang-engineering.com>
| 2024-05-06 13:40:17 +0200 |
|---|---|---|
| committer |  Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| 2024-05-10 11:48:33 +0100 |
| commit | aae20f6e34cd0cbd67a1d0e5877561c40109a81b (patch) | |
| tree | 0994f638e147ca290367b94a85d306435b92b62e /drivers/tty | |
| parent | tty: add the option to have a tty reject a new ldisc (diff) | |
| download | linux-aae20f6e34cd0cbd67a1d0e5877561c40109a81b.tar.gz linux-aae20f6e34cd0cbd67a1d0e5877561c40109a81b.tar.bz2 linux-aae20f6e34cd0cbd67a1d0e5877561c40109a81b.zip | |
serial: sh-sci: protect invalidating RXDMA on shutdown
The to-be-fixed commit removed locking when invalidating the DMA RX
descriptors on shutdown. It overlooked that there is still a rx_timer
running which may still access the protected data. So, re-add the
locking.
Reported-by: Dirk Behme <dirk.behme@de.bosch.com>
Closes: https://lore.kernel.org/r/ee6c9e16-9f29-450e-81da-4a8dceaa8fc7@de.bosch.com
Fixes: 2c4ee23530ff ("serial: sh-sci: Postpone DMA release when falling back to PIO")
Signed-off-by: Wolfram Sang <wsa+renesas@sang-engineering.com>
Link: https://lore.kernel.org/r/20240506114016.30498-7-wsa+renesas@sang-engineering.com
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/serial/sh-sci.c | 5 |
1 files changed, 5 insertions, 0 deletions
diff --git a/drivers/tty/serial/sh-sci.c b/drivers/tty/serial/sh-sci.c index 97031db26ae4..4d34950268b9 100644 --- a/drivers/tty/serial/sh-sci.c +++ b/drivers/tty/serial/sh-sci.c @@ -1270,9 +1270,14 @@ static void sci_dma_rx_chan_invalidate(struct sci_port *s) static void sci_dma_rx_release(struct sci_port *s) { struct dma_chan *chan = s->chan_rx_saved; + struct uart_port *port = &s->port; + unsigned long flags; + uart_port_lock_irqsave(port, &flags); s->chan_rx_saved = NULL; sci_dma_rx_chan_invalidate(s); + uart_port_unlock_irqrestore(port, flags); + dmaengine_terminate_sync(chan); dma_free_coherent(chan->device->dev, s->buf_len_rx * 2, s->rx_buf[0], sg_dma_address(&s->sg_rx[0])); |