From 9205218e491d70bf45f4527cd3bcb5cd3734ae17 Mon Sep 17 00:00:00 2001 From: Nicolas Ferre Date: Fri, 17 Jun 2016 12:05:46 +0200 Subject: [PATCH] tty/serial: atmel: re-integrate status check in irq handler The IRQ status check and related actions was done in the tasklet without benefit. So, move it back to the IRQ context to simplify IRQ handling and having the possibility to split the tasklet in two separated ones for receive and transmit actions. Signed-off-by: Nicolas Ferre Signed-off-by: Ludovic Desroches Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/atmel_serial.c | 43 ++++++++++++++++----------------------- 1 file changed, 17 insertions(+), 26 deletions(-) diff --git a/drivers/tty/serial/atmel_serial.c b/drivers/tty/serial/atmel_serial.c index 954941d..8854ac6 100644 --- a/drivers/tty/serial/atmel_serial.c +++ b/drivers/tty/serial/atmel_serial.c @@ -146,9 +146,7 @@ struct atmel_uart_port { struct scatterlist sg_tx; struct scatterlist sg_rx; struct tasklet_struct tasklet; - unsigned int irq_status; unsigned int irq_status_prev; - unsigned int status_change; unsigned int tx_len; struct circ_buf rx_ring; @@ -1237,14 +1235,27 @@ atmel_handle_status(struct uart_port *port, unsigned int pending, unsigned int status) { struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); + unsigned int status_change; if (pending & (ATMEL_US_RIIC | ATMEL_US_DSRIC | ATMEL_US_DCDIC | ATMEL_US_CTSIC)) { - atmel_port->irq_status = status; - atmel_port->status_change = atmel_port->irq_status ^ - atmel_port->irq_status_prev; + status_change = status ^ atmel_port->irq_status_prev; atmel_port->irq_status_prev = status; - tasklet_schedule(&atmel_port->tasklet); + + if (status_change & (ATMEL_US_RI | ATMEL_US_DSR + | ATMEL_US_DCD | ATMEL_US_CTS)) { + /* TODO: All reads to CSR will clear these interrupts! */ + if (status_change & ATMEL_US_RI) + port->icount.rng++; + if (status_change & ATMEL_US_DSR) + port->icount.dsr++; + if (status_change & ATMEL_US_DCD) + uart_handle_dcd_change(port, !(status & ATMEL_US_DCD)); + if (status_change & ATMEL_US_CTS) + uart_handle_cts_change(port, !(status & ATMEL_US_CTS)); + + wake_up_interruptible(&port->state->port.delta_msr_wait); + } } } @@ -1575,31 +1586,12 @@ static void atmel_tasklet_func(unsigned long data) { struct uart_port *port = (struct uart_port *)data; struct atmel_uart_port *atmel_port = to_atmel_uart_port(port); - unsigned int status = atmel_port->irq_status; - unsigned int status_change = atmel_port->status_change; /* The interrupt handler does not take the lock */ spin_lock(&port->lock); atmel_port->schedule_tx(port); - if (status_change & (ATMEL_US_RI | ATMEL_US_DSR - | ATMEL_US_DCD | ATMEL_US_CTS)) { - /* TODO: All reads to CSR will clear these interrupts! */ - if (status_change & ATMEL_US_RI) - port->icount.rng++; - if (status_change & ATMEL_US_DSR) - port->icount.dsr++; - if (status_change & ATMEL_US_DCD) - uart_handle_dcd_change(port, !(status & ATMEL_US_DCD)); - if (status_change & ATMEL_US_CTS) - uart_handle_cts_change(port, !(status & ATMEL_US_CTS)); - - wake_up_interruptible(&port->state->port.delta_msr_wait); - - atmel_port->status_change = 0; - } - atmel_port->schedule_rx(port); spin_unlock(&port->lock); @@ -1833,7 +1825,6 @@ static int atmel_startup(struct uart_port *port) /* Save current CSR for comparison in atmel_tasklet_func() */ atmel_port->irq_status_prev = atmel_get_lines_status(port); - atmel_port->irq_status = atmel_port->irq_status_prev; /* * Finally, enable the serial port -- 2.7.4