The patch below does not apply to the 4.14-stable tree.
If someone wants it applied there, or to any other stable or longterm
tree, then please email the backport, including the original git commit
id to <stable@xxxxxxxxxxxxxxx>.
Possible dependencies:
31352811e13d ("serial: 8250_dma: Fix DMA Rx completion race")
56dc5074cbec ("serial: 8250_dma: Rearm DMA Rx if more data is pending")
thanks,
greg k-h
------------------ original commit in Linus's tree ------------------
>From 31352811e13dc2313f101b890fd4b1ce760b5fe7 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Ilpo=20J=C3=A4rvinen?= <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Date: Mon, 30 Jan 2023 13:48:40 +0200
Subject: [PATCH] serial: 8250_dma: Fix DMA Rx completion race
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
__dma_rx_complete() is called from two places:
- Through the DMA completion callback dma_rx_complete()
- From serial8250_rx_dma_flush() after IIR_RLSI or IIR_RX_TIMEOUT
The former does not hold port's lock during __dma_rx_complete() which
allows these two to race and potentially insert the same data twice.
Extend port's lock coverage in dma_rx_complete() to prevent the race
and check if the DMA Rx is still pending completion before calling
into __dma_rx_complete().
Reported-by: Gilles BULOZ <gilles.buloz@xxxxxxxxxxx>
Tested-by: Gilles BULOZ <gilles.buloz@xxxxxxxxxxx>
Fixes: 9ee4b83e51f7 ("serial: 8250: Add support for dmaengine")
Cc: stable@xxxxxxxxxxxxxxx
Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@xxxxxxxxxxxxxxx>
Link: https://lore.kernel.org/r/20230130114841.25749-2-ilpo.jarvinen@xxxxxxxxxxxxxxx
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
diff --git a/drivers/tty/serial/8250/8250_dma.c b/drivers/tty/serial/8250/8250_dma.c
index 37d6af2ec427..5594883a96f8 100644
--- a/drivers/tty/serial/8250/8250_dma.c
+++ b/drivers/tty/serial/8250/8250_dma.c
@@ -62,9 +62,14 @@ static void dma_rx_complete(void *param)
struct uart_8250_dma *dma = p->dma;
unsigned long flags;
- __dma_rx_complete(p);
-
spin_lock_irqsave(&p->port.lock, flags);
+ if (dma->rx_running)
+ __dma_rx_complete(p);
+
+ /*
+ * Cannot be combined with the previous check because __dma_rx_complete()
+ * changes dma->rx_running.
+ */
if (!dma->rx_running && (serial_lsr_in(p) & UART_LSR_DR))
p->dma->rx_dma(p);
spin_unlock_irqrestore(&p->port.lock, flags);
