From 01d32d71610b0c56ce2c56bec370e275607a96e7 Mon Sep 17 00:00:00 2001 From: Alexandre TORGUE Date: Thu, 15 Sep 2016 18:42:41 +0200 Subject: [PATCH] serial: stm32: fix spin_lock management Signed-off-by: Gerald Baeza Signed-off-by: Alexandre TORGUE Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/stm32-usart.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 24c4d821472a..3b99d790fb3f 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 -- 2.39.5