From: Frank Rowand <frowand.list@gmail.com>
To: Andy Gross <andy.gross@linaro.org>,
David Brown <david.brown@linaro.org>,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>,
"linux-arm-msm@vger.kernel.org" <linux-arm-msm@vger.kernel.org>,
linux-soc@vger.kernel.org, linux-serial@vger.kernel.org,
Linux Kernel list <linux-kernel@vger.kernel.org>,
ivan.ivanov@linaro.org
Subject: [PATCH 1/2] tty: serial: msm_serial regression fix data corruption
Date: Sat, 23 Apr 2016 10:14:32 -0700 [thread overview]
Message-ID: <571BAD78.4020609@gmail.com> (raw)
In-Reply-To: <571BAC8B.80001@gmail.com>
From: Frank Rowand <frank.rowand@am.sony.com>
Commit 3a878c430fd6 ("tty: serial: msm: Add TX DMA support") regression.
The calculation of tx_count was moved from the old msm_handle_tx(),
now renamed msm_handle_tx_pio(), to the new msm_handle_tx(). The
move left out one size test.
The regression seen on the qcom-apq8074-dragonboard is dropped
characters and corrupted characters (values greater than 0x7f)
when DMA is not enabled.
Signed-off-by: Frank Rowand <frank.rowand@am.sony.com>
Cc: stable@vger.kernel.org
---
drivers/tty/serial/msm_serial.c | 5 ++---
1 file changed, 2 insertions(+), 3 deletions(-)
Index: b/drivers/tty/serial/msm_serial.c
===================================================================
--- a/drivers/tty/serial/msm_serial.c
+++ b/drivers/tty/serial/msm_serial.c
@@ -727,6 +727,8 @@ static void msm_handle_tx(struct uart_po
}
pio_count = CIRC_CNT(xmit->head, xmit->tail, UART_XMIT_SIZE);
+ pio_count = min3(pio_count, (unsigned int)UART_XMIT_SIZE - xmit->tail,
+ port->fifosize);
dma_count = CIRC_CNT_TO_END(xmit->head, xmit->tail, UART_XMIT_SIZE);
dma_min = 1; /* Always DMA */
@@ -738,9 +740,6 @@ static void msm_handle_tx(struct uart_po
dma_count = UARTDM_TX_MAX;
}
- if (pio_count > port->fifosize)
- pio_count = port->fifosize;
-
if (!dma->chan || dma_count < dma_min)
msm_handle_tx_pio(port, pio_count);
else
next prev parent reply other threads:[~2016-04-23 17:14 UTC|newest]
Thread overview: 12+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-04-23 17:10 [PATCH 0/2] tty: serial: msm_serial regression and add info message Frank Rowand
2016-04-23 17:14 ` Frank Rowand [this message]
2016-04-25 20:47 ` [PATCH 1/2] tty: serial: msm_serial regression fix data corruption Stephen Boyd
2016-04-25 22:31 ` Bjorn Andersson
2016-05-05 23:52 ` Andy Gross
2016-04-23 17:17 ` [PATCH 2/2] tty: serial: msm_serial add info message Frank Rowand
2016-04-25 20:48 ` Stephen Boyd
2016-04-25 21:31 ` Frank Rowand
2016-04-25 21:35 ` Stephen Boyd
2016-04-26 0:44 ` Frank Rowand
2016-04-28 20:51 ` Greg Kroah-Hartman
2016-04-28 22:15 ` Frank Rowand
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