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From: Tudor Ambarus <tudor.ambarus@microchip.com>
To: <ludovic.desroches@microchip.com>, <vkoul@kernel.org>,
	<richard.genoud@gmail.com>, <gregkh@linuxfoundation.org>,
	<jirislaby@kernel.org>
Cc: <nicolas.ferre@microchip.com>, <alexandre.belloni@bootlin.com>,
	<mripard@kernel.org>, <linux-arm-kernel@lists.infradead.org>,
	<dmaengine@vger.kernel.org>, <linux-kernel@vger.kernel.org>,
	<linux-serial@vger.kernel.org>,
	Tudor Ambarus <tudor.ambarus@microchip.com>
Subject: [PATCH v2 02/13] tty: serial: atmel: Check return code of dmaengine_submit()
Date: Thu, 25 Nov 2021 11:00:17 +0200	[thread overview]
Message-ID: <20211125090028.786832-3-tudor.ambarus@microchip.com> (raw)
In-Reply-To: <20211125090028.786832-1-tudor.ambarus@microchip.com>

The tx_submit() method of struct dma_async_tx_descriptor is entitled
to do sanity checks and return errors if encountered. It's not the
case for the DMA controller drivers that this client is using
(at_h/xdmac), because they currently don't do sanity checks and always
return a positive cookie at tx_submit() method. In case the controller
drivers will implement sanity checks and return errors, print a message
so that the client will be informed that something went wrong at
tx_submit() level.

Fixes: 08f738be88bb ("serial: at91: add tx dma support")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
---
 drivers/tty/serial/atmel_serial.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 2c99a47a2535..376f7a9c2868 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1004,6 +1004,11 @@ static void atmel_tx_dma(struct uart_port *port)
 		desc->callback = atmel_complete_tx_dma;
 		desc->callback_param = atmel_port;
 		atmel_port->cookie_tx = dmaengine_submit(desc);
+		if (dma_submit_error(atmel_port->cookie_tx)) {
+			dev_err(port->dev, "dma_submit_error %d\n",
+				atmel_port->cookie_tx);
+			return;
+		}
 	}
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -1258,6 +1263,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	desc->callback_param = port;
 	atmel_port->desc_rx = desc;
 	atmel_port->cookie_rx = dmaengine_submit(desc);
+	if (dma_submit_error(atmel_port->cookie_rx)) {
+		dev_err(port->dev, "dma_submit_error %d\n",
+			atmel_port->cookie_rx);
+		goto chan_err;
+	}
 
 	return 0;
 
-- 
2.25.1


WARNING: multiple messages have this Message-ID (diff)
From: Tudor Ambarus <tudor.ambarus@microchip.com>
To: <ludovic.desroches@microchip.com>, <vkoul@kernel.org>,
	<richard.genoud@gmail.com>, <gregkh@linuxfoundation.org>,
	<jirislaby@kernel.org>
Cc: alexandre.belloni@bootlin.com,
	Tudor Ambarus <tudor.ambarus@microchip.com>,
	mripard@kernel.org, linux-kernel@vger.kernel.org,
	linux-serial@vger.kernel.org, dmaengine@vger.kernel.org,
	linux-arm-kernel@lists.infradead.org
Subject: [PATCH v2 02/13] tty: serial: atmel: Check return code of dmaengine_submit()
Date: Thu, 25 Nov 2021 11:00:17 +0200	[thread overview]
Message-ID: <20211125090028.786832-3-tudor.ambarus@microchip.com> (raw)
In-Reply-To: <20211125090028.786832-1-tudor.ambarus@microchip.com>

The tx_submit() method of struct dma_async_tx_descriptor is entitled
to do sanity checks and return errors if encountered. It's not the
case for the DMA controller drivers that this client is using
(at_h/xdmac), because they currently don't do sanity checks and always
return a positive cookie at tx_submit() method. In case the controller
drivers will implement sanity checks and return errors, print a message
so that the client will be informed that something went wrong at
tx_submit() level.

Fixes: 08f738be88bb ("serial: at91: add tx dma support")
Signed-off-by: Tudor Ambarus <tudor.ambarus@microchip.com>
Acked-by: Richard Genoud <richard.genoud@gmail.com>
---
 drivers/tty/serial/atmel_serial.c | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c
index 2c99a47a2535..376f7a9c2868 100644
--- a/drivers/tty/serial/atmel_serial.c
+++ b/drivers/tty/serial/atmel_serial.c
@@ -1004,6 +1004,11 @@ static void atmel_tx_dma(struct uart_port *port)
 		desc->callback = atmel_complete_tx_dma;
 		desc->callback_param = atmel_port;
 		atmel_port->cookie_tx = dmaengine_submit(desc);
+		if (dma_submit_error(atmel_port->cookie_tx)) {
+			dev_err(port->dev, "dma_submit_error %d\n",
+				atmel_port->cookie_tx);
+			return;
+		}
 	}
 
 	if (uart_circ_chars_pending(xmit) < WAKEUP_CHARS)
@@ -1258,6 +1263,11 @@ static int atmel_prepare_rx_dma(struct uart_port *port)
 	desc->callback_param = port;
 	atmel_port->desc_rx = desc;
 	atmel_port->cookie_rx = dmaengine_submit(desc);
+	if (dma_submit_error(atmel_port->cookie_rx)) {
+		dev_err(port->dev, "dma_submit_error %d\n",
+			atmel_port->cookie_rx);
+		goto chan_err;
+	}
 
 	return 0;
 
-- 
2.25.1


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  parent reply	other threads:[~2021-11-25  9:02 UTC|newest]

Thread overview: 40+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-11-25  9:00 [PATCH v2 00/13] dmaengine: at_xdmac: Various fixes Tudor Ambarus
2021-11-25  9:00 ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 01/13] dmaengine: at_xdmac: Don't start transactions at tx_submit level Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` Tudor Ambarus [this message]
2021-11-25  9:00   ` [PATCH v2 02/13] tty: serial: atmel: Check return code of dmaengine_submit() Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 03/13] tty: serial: atmel: Call dma_async_issue_pending() Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 04/13] dmaengine: at_xdmac: Start transfer for cyclic channels in issue_pending Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 05/13] dmaengine: at_xdmac: Print debug message after realeasing the lock Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 06/13] dmaengine: at_xdmac: Fix concurrency over chan's completed_cookie Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 07/13] dmaengine: at_xdmac: Fix race for the tx desc callback Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 08/13] dmaengine: at_xdmac: Move the free desc to the tail of the desc list Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-12-13  8:07   ` Vinod Koul
2021-12-13  8:07     ` Vinod Koul
2021-12-13  8:51     ` Tudor.Ambarus
2021-12-13  8:51       ` Tudor.Ambarus
2021-12-13  8:59       ` Vinod Koul
2021-12-13  8:59         ` Vinod Koul
2021-12-13  9:00         ` Vinod Koul
2021-12-13  9:00           ` Vinod Koul
2021-12-13  9:22           ` Tudor.Ambarus
2021-12-13  9:22             ` Tudor.Ambarus
2021-12-13  9:27             ` Tudor.Ambarus
2021-12-13  9:27               ` Tudor.Ambarus
2021-11-25  9:00 ` [PATCH v2 09/13] dmaengine: at_xdmac: Fix concurrency over xfers_list Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 10/13] dmaengine: at_xdmac: Remove a level of indentation in at_xdmac_advance_work() Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 11/13] dmaengine: at_xdmac: Fix lld view setting Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 12/13] dmaengine: at_xdmac: Fix at_xdmac_lld struct definition Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus
2021-11-25  9:00 ` [PATCH v2 13/13] dmaengine: at_xdmac: Fix race over irq_status Tudor Ambarus
2021-11-25  9:00   ` Tudor Ambarus

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