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From: Erwan Le Ray <erwan.leray@foss.st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <linux-serial@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Erwan Le Ray <erwan.leray@foss.st.com>,
	Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
	Valentin Caron <valentin.caron@foss.st.com>
Subject: [PATCH v2 09/13] serial: stm32: call stm32_transmit_chars locked
Date: Thu, 4 Mar 2021 17:23:04 +0100	[thread overview]
Message-ID: <20210304162308.8984-10-erwan.leray@foss.st.com> (raw)
In-Reply-To: <20210304162308.8984-1-erwan.leray@foss.st.com>

stm32_transmit_chars should be called under lock also in tx DMA callback.

Fixes: 3489187204eb ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 74046ae3a412..2bdd04a47f91 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -291,13 +291,16 @@ static void stm32_usart_tx_dma_complete(void *arg)
 	struct uart_port *port = arg;
 	struct stm32_port *stm32port = to_stm32_port(port);
 	const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+	unsigned long flags;
 
 	dmaengine_terminate_async(stm32port->tx_ch);
 	stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
 	stm32port->tx_dma_busy = false;
 
 	/* Let's see if we have pending data to send */
+	spin_lock_irqsave(&port->lock, flags);
 	stm32_usart_transmit_chars(port);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void stm32_usart_tx_interrupt_enable(struct uart_port *port)
-- 
2.17.1


WARNING: multiple messages have this Message-ID (diff)
From: Erwan Le Ray <erwan.leray@foss.st.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
	Jiri Slaby <jslaby@suse.com>,
	Maxime Coquelin <mcoquelin.stm32@gmail.com>,
	Alexandre Torgue <alexandre.torgue@foss.st.com>
Cc: <linux-serial@vger.kernel.org>,
	<linux-stm32@st-md-mailman.stormreply.com>,
	<linux-arm-kernel@lists.infradead.org>,
	<linux-kernel@vger.kernel.org>,
	Erwan Le Ray <erwan.leray@foss.st.com>,
	Fabrice Gasnier <fabrice.gasnier@foss.st.com>,
	Valentin Caron <valentin.caron@foss.st.com>
Subject: [PATCH v2 09/13] serial: stm32: call stm32_transmit_chars locked
Date: Thu, 4 Mar 2021 17:23:04 +0100	[thread overview]
Message-ID: <20210304162308.8984-10-erwan.leray@foss.st.com> (raw)
In-Reply-To: <20210304162308.8984-1-erwan.leray@foss.st.com>

stm32_transmit_chars should be called under lock also in tx DMA callback.

Fixes: 3489187204eb ("serial: stm32: adding dma support")
Signed-off-by: Erwan Le Ray <erwan.leray@foss.st.com>
Signed-off-by: Fabrice Gasnier <fabrice.gasnier@foss.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 74046ae3a412..2bdd04a47f91 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -291,13 +291,16 @@ static void stm32_usart_tx_dma_complete(void *arg)
 	struct uart_port *port = arg;
 	struct stm32_port *stm32port = to_stm32_port(port);
 	const struct stm32_usart_offsets *ofs = &stm32port->info->ofs;
+	unsigned long flags;
 
 	dmaengine_terminate_async(stm32port->tx_ch);
 	stm32_usart_clr_bits(port, ofs->cr3, USART_CR3_DMAT);
 	stm32port->tx_dma_busy = false;
 
 	/* Let's see if we have pending data to send */
+	spin_lock_irqsave(&port->lock, flags);
 	stm32_usart_transmit_chars(port);
+	spin_unlock_irqrestore(&port->lock, flags);
 }
 
 static void stm32_usart_tx_interrupt_enable(struct uart_port *port)
-- 
2.17.1


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  parent reply	other threads:[~2021-03-04 16:25 UTC|newest]

Thread overview: 28+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-03-04 16:22 [PATCH v2 00/13] stm32 usart various fixes Erwan Le Ray
2021-03-04 16:22 ` Erwan Le Ray
2021-03-04 16:22 ` [PATCH v2 01/13] serial: stm32: fix probe and remove order for dma Erwan Le Ray
2021-03-04 16:22   ` Erwan Le Ray
2021-03-04 16:22 ` [PATCH v2 02/13] serial: stm32: fix startup by enabling usart for reception Erwan Le Ray
2021-03-04 16:22   ` Erwan Le Ray
2021-03-04 16:22 ` [PATCH v2 03/13] serial: stm32: fix incorrect characters on console Erwan Le Ray
2021-03-04 16:22   ` Erwan Le Ray
2021-03-04 16:22 ` [PATCH v2 04/13] serial: stm32: fix TX and RX FIFO thresholds Erwan Le Ray
2021-03-04 16:22   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 05/13] serial: stm32: fix a deadlock condition with wakeup event Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 06/13] serial: stm32: fix wake-up flag handling Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 07/13] serial: stm32: fix a deadlock in set_termios Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 08/13] serial: stm32: fix tx dma completion, release channel Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` Erwan Le Ray [this message]
2021-03-04 16:23   ` [PATCH v2 09/13] serial: stm32: call stm32_transmit_chars locked Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 10/13] serial: stm32: fix FIFO flush in startup and set_termios Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 11/13] serial: stm32: add FIFO flush when port is closed Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 12/13] serial: stm32: fix tx_empty condition Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray
2021-03-04 16:23 ` [PATCH v2 13/13] serial: stm32: add support for "flush_buffer" ops Erwan Le Ray
2021-03-04 16:23   ` Erwan Le Ray

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