This is a note to let you know that I've just added the patch titled
8250_core: Fix unwanted TX chars write
to the 3.14-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
8250_core-fix-unwanted-tx-chars-write.patch
and it can be found in the queue-3.14 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From b08c9c317e3f7764a91d522cd031639ba42b98cc Mon Sep 17 00:00:00 2001
From: Loic Poulain <loic.poulain@xxxxxxxxx>
Date: Thu, 24 Apr 2014 11:38:56 +0200
Subject: 8250_core: Fix unwanted TX chars write
From: Loic Poulain <loic.poulain@xxxxxxxxx>
commit b08c9c317e3f7764a91d522cd031639ba42b98cc upstream.
On transmit-hold-register empty, serial8250_tx_chars
should be called only if we don't use DMA.
DMA has its own tx cycle.
Signed-off-by: Loic Poulain <loic.poulain@xxxxxxxxx>
Reviewed-by: Heikki Krogerus <heikki.krogerus@xxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
drivers/tty/serial/8250/8250_core.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
--- a/drivers/tty/serial/8250/8250_core.c
+++ b/drivers/tty/serial/8250/8250_core.c
@@ -1520,7 +1520,7 @@ int serial8250_handle_irq(struct uart_po
status = serial8250_rx_chars(up, status);
}
serial8250_modem_status(up);
- if (status & UART_LSR_THRE)
+ if (!up->dma && (status & UART_LSR_THRE))
serial8250_tx_chars(up);
spin_unlock_irqrestore(&port->lock, flags);
Patches currently in stable-queue which might be from loic.poulain@xxxxxxxxx are
queue-3.14/8250_core-fix-unwanted-tx-chars-write.patch
queue-3.14/serial-8250-fix-thread-unsafe-__dma_tx_complete-function.patch
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