spi: spi-stm32: remove redundant irqsave and irqrestore in hardIRQ

Running in hardIRQ, disabling IRQ is redundant.
Signed-off-by: Barry Song <song.bao.hua@hisilicon.com>
Link: https://lore.kernel.org/r/20200926001616.21292-2-song.bao.hua@hisilicon.comSigned-off-by: Mark Brown <broonie@kernel.org>

drivers/spi/spi-stm32.c

@@ -804,10 +804,9 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 	struct spi_master *master = dev_id;
 	struct stm32_spi *spi = spi_master_get_devdata(master);
 	u32 sr, mask = 0;
-	unsigned long flags;
 	bool end = false;
 
-	spin_lock_irqsave(&spi->lock, flags);
+	spin_lock(&spi->lock);
 
 	sr = readl_relaxed(spi->base + STM32F4_SPI_SR);
 	/*
@@ -833,7 +832,7 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 
 	if (!(sr & mask)) {
 		dev_dbg(spi->dev, "spurious IT (sr=0x%08x)\n", sr);
-		spin_unlock_irqrestore(&spi->lock, flags);
+		spin_unlock(&spi->lock);
 		return IRQ_NONE;
 	}
 
@@ -875,11 +874,11 @@ static irqreturn_t stm32f4_spi_irq_event(int irq, void *dev_id)
 					STM32F4_SPI_CR2_TXEIE |
 					STM32F4_SPI_CR2_RXNEIE |
 					STM32F4_SPI_CR2_ERRIE);
-		spin_unlock_irqrestore(&spi->lock, flags);
+		spin_unlock(&spi->lock);
 		return IRQ_WAKE_THREAD;
 	}
 
-	spin_unlock_irqrestore(&spi->lock, flags);
+	spin_unlock(&spi->lock);
 	return IRQ_HANDLED;
 }