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[09/11] serial: stm32: fix spin_lock management

Message ID 1473957763-30629-10-git-send-email-alexandre.torgue@st.com (mailing list archive)
State New, archived
Headers show

Commit Message

Alexandre TORGUE Sept. 15, 2016, 4:42 p.m. UTC 
Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
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Patch

diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c
index 24c4d82..3b99d79 100644
--- a/drivers/tty/serial/stm32-usart.c
+++ b/drivers/tty/serial/stm32-usart.c
@@ -321,6 +321,8 @@  static irqreturn_t stm32_interrupt(int irq, void *ptr)
 	struct stm32_usart_offsets *ofs = &stm32_port->info->ofs;
 	u32 sr;
 
+	spin_lock(&port->lock);
+
 	sr = readl_relaxed(port->membase + ofs->isr);
 
 	if ((sr & USART_SR_RXNE) && !(stm32_port->rx_ch))
@@ -329,6 +331,8 @@  static irqreturn_t stm32_interrupt(int irq, void *ptr)
 	if ((sr & USART_SR_TXE) && !(stm32_port->tx_ch))
 		stm32_transmit_chars(port);
 
+	spin_unlock(&port->lock);
+
 	if (stm32_port->rx_ch)
 		return IRQ_WAKE_THREAD;
 	else