From 0f32f976ebaa7d8643fcd9419f12bc801ba14407 Mon Sep 17 00:00:00 2001 From: Matthew McClintock Date: Thu, 10 Mar 2016 16:44:55 -0600 Subject: [PATCH 07/69] spi: qup: properly detect extra interrupts It's possible for a SPI transaction to complete and get another interrupt and have it processed on the same spi_transfer before the transfer_one can set it to NULL. This masks unexpected interrupts, so let's set the spi_transfer to NULL in the interrupt once the transaction is done. So we can properly detect these bad interrupts and print warning messages. Signed-off-by: Matthew McClintock --- drivers/spi/spi-qup.c | 15 +++++++++------ 1 file changed, 9 insertions(+), 6 deletions(-) --- a/drivers/spi/spi-qup.c +++ b/drivers/spi/spi-qup.c @@ -507,6 +507,7 @@ static irqreturn_t spi_qup_qup_irq(int i u32 opflags, qup_err, spi_err; unsigned long flags; int error = 0; + bool done = 0; spin_lock_irqsave(&controller->lock, flags); xfer = controller->xfer; @@ -565,16 +566,19 @@ static irqreturn_t spi_qup_qup_irq(int i spi_qup_write(controller, xfer); } - spin_lock_irqsave(&controller->lock, flags); - controller->error = error; - controller->xfer = xfer; - spin_unlock_irqrestore(&controller->lock, flags); - /* re-read opflags as flags may have changed due to actions above */ opflags = readl_relaxed(controller->base + QUP_OPERATIONAL); if ((controller->rx_bytes == xfer->len && (opflags & QUP_OP_MAX_INPUT_DONE_FLAG)) || error) + done = true; + + spin_lock_irqsave(&controller->lock, flags); + controller->error = error; + controller->xfer = done ? NULL : xfer; + spin_unlock_irqrestore(&controller->lock, flags); + + if (done) complete(&controller->done); return IRQ_HANDLED; @@ -767,7 +771,6 @@ static int spi_qup_transfer_one(struct s exit: spi_qup_set_state(controller, QUP_STATE_RESET); spin_lock_irqsave(&controller->lock, flags); - controller->xfer = NULL; if (!ret) ret = controller->error; spin_unlock_irqrestore(&controller->lock, flags);