diff options
| author | Alexandre TORGUE <alexandre.torgue@st.com> | 2016-09-15 18:42:41 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2016-09-22 11:48:55 +0200 |
| commit | 01d32d71610b0c56ce2c56bec370e275607a96e7 (patch) | |
| tree | cb2a077690587c8c2273126d3c0c010b96493b86 /drivers | |
| parent | 3489187204eb75e5635d8836babfd0a18be613f4 (diff) | |
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>
Diffstat (limited to 'drivers')
| -rw-r--r-- | drivers/tty/serial/stm32-usart.c | 4 |
1 files changed, 4 insertions, 0 deletions
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 |