From 3e3c13488e4efa0236c47a98ee5e759bf1f7c757 Mon Sep 17 00:00:00 2001 From: Phil Elwell Date: Thu, 11 Jul 2019 13:13:39 +0100 Subject: [PATCH] tty: amba-pl011: Make TX optimisation conditional pl011_tx_chars takes a "from_irq" parameter to reduce the number of register accesses. When from_irq is true the function assumes that the FIFO is half empty and writes up to half a FIFO's worth of bytes without polling the FIFO status register, the reasoning being that the function is being called as a result of the TX interrupt being raised. This logic would work were it not for the fact that pl011_rx_chars, called from pl011_int before pl011_tx_chars, releases the spinlock before calling tty_flip_buffer_push. A user thread writing to the UART claims the spinlock and ultimately calls pl011_tx_chars with from_irq set to false. This reverts to the older logic that polls the FIFO status register before sending every byte. If this happen on an SMP system during the section of the IRQ handler where the spinlock has been released, then by the time the TX interrupt handler is called, the FIFO may already be full, and any further writes are likely to be lost. The fix involves adding a per-port flag that is true iff running from within the interrupt handler and the spinlock has not yet been released. This flag is then used as the value for the from_irq parameter of pl011_tx_chars, causing polling to be used in the unsafe case. Fixes: 1e84d22322ce ("serial/amba-pl011: Refactor and simplify TX FIFO handling") Signed-off-by: Phil Elwell --- drivers/tty/serial/amba-pl011.c | 7 ++++++- 1 file changed, 6 insertions(+), 1 deletion(-) --- a/drivers/tty/serial/amba-pl011.c +++ b/drivers/tty/serial/amba-pl011.c @@ -270,6 +270,7 @@ struct uart_amba_port { unsigned int old_cr; /* state during shutdown */ unsigned int fixed_baud; /* vendor-set fixed baud rate */ char type[12]; + bool irq_locked; /* in irq, unreleased lock */ #ifdef CONFIG_DMA_ENGINE /* DMA stuff */ bool using_tx_dma; @@ -813,6 +814,7 @@ __acquires(&uap->port.lock) if (!uap->using_tx_dma) return; + uap->irq_locked = 0; dmaengine_terminate_async(uap->dmatx.chan); if (uap->dmatx.queued) { @@ -939,6 +941,7 @@ static void pl011_dma_rx_chars(struct ua fifotaken = pl011_fifo_to_tty(uap); } + uap->irq_locked = 0; spin_unlock(&uap->port.lock); dev_vdbg(uap->port.dev, "Took %d chars from DMA buffer and %d chars from the FIFO\n", @@ -1347,6 +1350,7 @@ __acquires(&uap->port.lock) { pl011_fifo_to_tty(uap); + uap->irq_locked = 0; spin_unlock(&uap->port.lock); tty_flip_buffer_push(&uap->port.state->port); /* @@ -1482,6 +1486,7 @@ static irqreturn_t pl011_int(int irq, vo int handled = 0; spin_lock_irqsave(&uap->port.lock, flags); + uap->irq_locked = 1; status = pl011_read(uap, REG_RIS) & uap->im; if (status) { do { @@ -1501,7 +1506,7 @@ static irqreturn_t pl011_int(int irq, vo UART011_CTSMIS|UART011_RIMIS)) pl011_modem_status(uap); if (status & UART011_TXIS) - pl011_tx_chars(uap, true); + pl011_tx_chars(uap, uap->irq_locked); if (pass_counter-- == 0) break;