From: zhiyong tao <zhiyong.tao@mediatek.com>
To: Andy Shevchenko <andy.shevchenko@gmail.com>
Cc: "timur@kernel.org" <timur@kernel.org>,
"linux@armlinux.org.uk" <linux@armlinux.org.uk>,
"alcooperx@gmail.com" <alcooperx@gmail.com>,
"tklauser@distanz.ch" <tklauser@distanz.ch>,
"sean.wang@kernel.org" <sean.wang@kernel.org>,
"srv_heupstream@mediatek.com" <srv_heupstream@mediatek.com>,
"hui.liu@mediatek.com" <hui.liu@mediatek.com>,
"yuchen.huang@mediatek.com" <yuchen.huang@mediatek.com>,
"huihui.wang@mediatek.com" <huihui.wang@mediatek.com>,
"eddie.huang@mediatek.com" <eddie.huang@mediatek.com>,
"sean.wang@mediatek.com" <sean.wang@mediatek.com>,
"devicetree@vger.kernel.org" <devicetree@vger.kernel.org>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"linux-arm-kernel@lists.infradead.org"
<linux-arm-kernel@lists.infradead.org>,
"linux-mediatek@lists.infradead.org"
<linux-mediatek@lists.infradead.org>,
"linux-serial@vger.kernel.org" <linux-serial@vger.kernel.org>
Subject: Re: [PATCH] uart: mediatek: fix memory corruption issue
Date: Thu, 22 Jul 2021 17:04:25 +0800 [thread overview]
Message-ID: <1626944665.29611.22.camel@mhfsdcap03> (raw)
In-Reply-To: <CAHp75VeZL53VN0w3O160vMurmRT9ZJzJek6=4X6osqjJDuxD3g@mail.gmail.com>
On Wed, 2021-07-14 at 01:20 +0300, Andy Shevchenko wrote:
>
>
> On Saturday, July 10, 2021, Zhiyong Tao <zhiyong.tao@mediatek.com>
> wrote:
>
>
> Please, use “serial: 8260_mtk:” prefix.
==> Hi Andy,
Thanks for your suggestion.
we will change it in the next version.
>
> This patch is used to fix memory
>
>
>
> This is completely confusing start of the sentence. The form of “be
> used to” strongly suggests two things: 1) it was a patch to fix
> something; 2) it is not used anymore and never considered to be used
> again,
>
>
> Besides that Submitting Patches document highly recommends to avoid
> sentences that starts with “this patch”.
>
==>We will change the commit message as "Fix uart corruption issue when
rx power off "in the next version.
Thanks.
>
> corruption issue when rx power off.
> 1. add spin lock in mtk8250_dma_rx_complete function in APDMA
> mode.
> 2. add processing mechanism which count value is 0
>
> Signed-off-by: Zhiyong Tao <zhiyong.tao@mediatek.com>
> ---
> drivers/tty/serial/8250/8250_mtk.c | 15 +++++++++++----
> 1 file changed, 11 insertions(+), 4 deletions(-)
>
> diff --git a/drivers/tty/serial/8250/8250_mtk.c
> b/drivers/tty/serial/8250/8250_mtk.c
> index f7d3023f860f..09f7d2166315 100644
> --- a/drivers/tty/serial/8250/8250_mtk.c
> +++ b/drivers/tty/serial/8250/8250_mtk.c
> @@ -91,12 +91,15 @@ static void mtk8250_dma_rx_complete(void
> *param)
> struct mtk8250_data *data = up->port.private_data;
> struct tty_port *tty_port = &up->port.state->port;
> struct dma_tx_state state;
> - int copied, total, cnt;
> + unsigned int copied, total, cnt;
> unsigned char *ptr;
> + unsigned long flags;
>
> if (data->rx_status == DMA_RX_SHUTDOWN)
> return;
>
> + spin_lock_irqsave(&up->port.lock, flags);
> +
> dmaengine_tx_status(dma->rxchan, dma->rx_cookie,
> &state);
> total = dma->rx_size - state.residue;
> cnt = total;
> @@ -104,9 +107,11 @@ static void mtk8250_dma_rx_complete(void
> *param)
> if ((data->rx_pos + cnt) > dma->rx_size)
> cnt = dma->rx_size - data->rx_pos;
>
> - ptr = (unsigned char *)(data->rx_pos + dma->rx_buf);
> - copied = tty_insert_flip_string(tty_port, ptr, cnt);
> - data->rx_pos += cnt;
> + if (cnt != 0) {
> + ptr = (unsigned char *)(data->rx_pos +
> dma->rx_buf);
> + copied = tty_insert_flip_string(tty_port, ptr,
> cnt);
> + data->rx_pos += cnt;
> + }
>
> if (total > cnt) {
> ptr = (unsigned char *)(dma->rx_buf);
> @@ -120,6 +125,8 @@ static void mtk8250_dma_rx_complete(void
> *param)
> tty_flip_buffer_push(tty_port);
>
> mtk8250_rx_dma(up);
> +
> + spin_unlock_irqrestore(&up->port.lock, flags);
> }
>
> static void mtk8250_rx_dma(struct uart_8250_port *up)
>
>
prev parent reply other threads:[~2021-07-22 9:04 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-07-10 9:01 [PATCH 0/1] Mediatek uart patch Zhiyong Tao
2021-07-10 9:01 ` [PATCH] uart: mediatek: fix memory corruption issue Zhiyong Tao
2021-07-21 10:46 ` Greg KH
2021-07-22 10:03 ` zhiyong tao
2021-07-22 10:12 ` Greg KH
2021-07-22 11:52 ` zhiyong tao
[not found] ` <CAHp75VeZL53VN0w3O160vMurmRT9ZJzJek6=4X6osqjJDuxD3g@mail.gmail.com>
2021-07-22 9:04 ` zhiyong tao [this message]
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