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serial: stm32: fix spin_lock management 

Signed-off-by: Gerald Baeza <gerald.baeza@st.com>
Signed-off-by: Alexandre TORGUE <alexandre.torgue@st.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Alexandre TORGUE 2016-09-15 18:42:41 +02:00 committed by Greg Kroah-Hartman
parent 3489187204
commit 01d32d7161
1 changed files with 4 additions and 0 deletions
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4
drivers/tty/serial/stm32-usart.c
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@ -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