linux-kernel - [PATCH 1/2] serial: stm32: reset dma buffers during probe

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Message-ID: <20210527091537.8997-2-erwan.leray@foss.st.com>
Date:   Thu, 27 May 2021 11:15:36 +0200
From:   Erwan Le Ray <erwan.leray@...s.st.com>
To:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Jiri Slaby <jslaby@...e.com>,
        Maxime Coquelin <mcoquelin.stm32@...il.com>,
        Alexandre Torgue <alexandre.torgue@...s.st.com>
CC:     <linux-serial@...r.kernel.org>,
        <linux-stm32@...md-mailman.stormreply.com>,
        <linux-arm-kernel@...ts.infradead.org>,
        <linux-kernel@...r.kernel.org>,
        Erwan Le Ray <erwan.leray@...s.st.com>,
        Fabrice Gasnier <fabrice.gasnier@...s.st.com>,
        Valentin Caron <valentin.caron@...s.st.com>,
        Amelie Delaunay <amelie.delaunay@...s.st.com>
Subject: [PATCH 1/2] serial: stm32: reset dma buffers during probe

Reset Rx and Tx dma buffers during probe to avoid freeing
invalid buffer in no dma mode.

Signed-off-by: Erwan Le Ray <erwan.leray@...s.st.com>

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index c2ae7b392b86..2ac3b30477a7 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -1168,6 +1168,8 @@ static struct stm32_port *stm32_usart_of_get_port(struct platform_device *pdev)
 	stm32_ports[id].cr1_irq = USART_CR1_RXNEIE;
 	stm32_ports[id].cr3_irq = 0;
 	stm32_ports[id].last_res = RX_BUF_L;
+	stm32_ports[id].rx_dma_buf = 0;
+	stm32_ports[id].tx_dma_buf = 0;
 	return &stm32_ports[id];
 }
 
-- 
2.17.1