From: Soren Brinkmann <soren.brinkmann@xilinx.com>
To: Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Jiri Slaby <jslaby@suse.com>
Cc: Michal Simek <michal.simek@xilinx.com>,
linux-serial@vger.kernel.org,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org,
Peter Hurley <peter@hurleysoftware.com>,
Soren Brinkmann <soren.brinkmann@xilinx.com>
Subject: [PATCH LINUX 3/6] tty: xuartps: Cleanup: Reformat if-else
Date: Mon, 11 Jan 2016 17:41:38 -0800 [thread overview]
Message-ID: <1452562901-17848-4-git-send-email-soren.brinkmann@xilinx.com> (raw)
In-Reply-To: <1452562901-17848-1-git-send-email-soren.brinkmann@xilinx.com>
Convert an if-else into the more common early return on error, reducing
the indent level of the happy path.
Signed-off-by: Soren Brinkmann <soren.brinkmann@xilinx.com>
---
drivers/tty/serial/xilinx_uartps.c | 124 ++++++++++++++++++-------------------
1 file changed, 62 insertions(+), 62 deletions(-)
diff --git a/drivers/tty/serial/xilinx_uartps.c b/drivers/tty/serial/xilinx_uartps.c
index a0039cbcf812..8014dd3c6d55 100644
--- a/drivers/tty/serial/xilinx_uartps.c
+++ b/drivers/tty/serial/xilinx_uartps.c
@@ -202,58 +202,55 @@ static void cdns_uart_handle_rx(struct uart_port *port, unsigned int isrstatus)
isrstatus &= port->read_status_mask;
isrstatus &= ~port->ignore_status_mask;
- if ((isrstatus & CDNS_UART_IXR_TOUT) ||
- (isrstatus & CDNS_UART_IXR_RXTRIG)) {
- /* Receive Timeout Interrupt */
- while (!(readl(port->membase + CDNS_UART_SR_OFFSET) &
- CDNS_UART_SR_RXEMPTY)) {
- u32 data;
- char status = TTY_NORMAL;
-
- data = readl(port->membase + CDNS_UART_FIFO_OFFSET);
-
- /* Non-NULL byte after BREAK is garbage (99%) */
- if (data && (port->read_status_mask &
- CDNS_UART_IXR_BRK)) {
- port->read_status_mask &= ~CDNS_UART_IXR_BRK;
- port->icount.brk++;
- if (uart_handle_break(port))
- continue;
- }
+ if (!(isrstatus & (CDNS_UART_IXR_TOUT | CDNS_UART_IXR_RXTRIG)))
+ return;
+
+ while (!(readl(port->membase + CDNS_UART_SR_OFFSET) &
+ CDNS_UART_SR_RXEMPTY)) {
+ u32 data;
+ char status = TTY_NORMAL;
+
+ data = readl(port->membase + CDNS_UART_FIFO_OFFSET);
+
+ /* Non-NULL byte after BREAK is garbage (99%) */
+ if (data && (port->read_status_mask & CDNS_UART_IXR_BRK)) {
+ port->read_status_mask &= ~CDNS_UART_IXR_BRK;
+ port->icount.brk++;
+ if (uart_handle_break(port))
+ continue;
+ }
#ifdef SUPPORT_SYSRQ
- /*
- * uart_handle_sysrq_char() doesn't work if
- * spinlocked, for some reason
- */
- if (port->sysrq) {
- spin_unlock(&port->lock);
- if (uart_handle_sysrq_char(port,
- (unsigned char)data)) {
- spin_lock(&port->lock);
- continue;
- }
+ /*
+ * uart_handle_sysrq_char() doesn't work if
+ * spinlocked, for some reason
+ */
+ if (port->sysrq) {
+ spin_unlock(&port->lock);
+ if (uart_handle_sysrq_char(port, data)) {
spin_lock(&port->lock);
+ continue;
}
+ spin_lock(&port->lock);
+ }
#endif
- port->icount.rx++;
-
- if (isrstatus & CDNS_UART_IXR_PARITY) {
- port->icount.parity++;
- status = TTY_PARITY;
- } else if (isrstatus & CDNS_UART_IXR_FRAMING) {
- port->icount.frame++;
- status = TTY_FRAME;
- } else if (isrstatus & CDNS_UART_IXR_OVERRUN) {
- port->icount.overrun++;
- }
+ port->icount.rx++;
- uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
- data, status);
+ if (isrstatus & CDNS_UART_IXR_PARITY) {
+ port->icount.parity++;
+ status = TTY_PARITY;
+ } else if (isrstatus & CDNS_UART_IXR_FRAMING) {
+ port->icount.frame++;
+ status = TTY_FRAME;
+ } else if (isrstatus & CDNS_UART_IXR_OVERRUN) {
+ port->icount.overrun++;
}
- tty_flip_buffer_push(&port->state->port);
+
+ uart_insert_char(port, isrstatus, CDNS_UART_IXR_OVERRUN,
+ data, status);
}
+ tty_flip_buffer_push(&port->state->port);
}
/**
@@ -1429,27 +1426,30 @@ static int cdns_uart_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "Cannot get uart_port structure\n");
rc = -ENODEV;
goto err_out_notif_unreg;
- } else {
- /* Register the port.
- * This function also registers this device with the tty layer
- * and triggers invocation of the config_port() entry point.
- */
- port->mapbase = res->start;
- port->irq = irq;
- port->dev = &pdev->dev;
- port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
- port->private_data = cdns_uart_data;
- cdns_uart_data->port = port;
- platform_set_drvdata(pdev, port);
- rc = uart_add_one_port(&cdns_uart_uart_driver, port);
- if (rc) {
- dev_err(&pdev->dev,
- "uart_add_one_port() failed; err=%i\n", rc);
- goto err_out_notif_unreg;
- }
- return 0;
}
+ /*
+ * Register the port.
+ * This function also registers this device with the tty layer
+ * and triggers invocation of the config_port() entry point.
+ */
+ port->mapbase = res->start;
+ port->irq = irq;
+ port->dev = &pdev->dev;
+ port->uartclk = clk_get_rate(cdns_uart_data->uartclk);
+ port->private_data = cdns_uart_data;
+ cdns_uart_data->port = port;
+ platform_set_drvdata(pdev, port);
+
+ rc = uart_add_one_port(&cdns_uart_uart_driver, port);
+ if (rc) {
+ dev_err(&pdev->dev,
+ "uart_add_one_port() failed; err=%i\n", rc);
+ goto err_out_notif_unreg;
+ }
+
+ return 0;
+
err_out_notif_unreg:
#ifdef CONFIG_COMMON_CLK
clk_notifier_unregister(cdns_uart_data->uartclk,
--
2.7.0.3.g497ea1e
next prev parent reply other threads:[~2016-01-12 1:41 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
2016-01-12 1:41 [PATCH LINUX 0/6] Second part of xuartps fixes Soren Brinkmann
2016-01-12 1:41 ` [PATCH LINUX 1/6] tty: xuartps: Move request_irq to after setting up the HW Soren Brinkmann
2016-01-12 1:41 ` [PATCH LINUX 2/6] tty: xuartps: Refactor IRQ handling Soren Brinkmann
2016-01-12 1:41 ` Soren Brinkmann [this message]
2016-01-12 1:41 ` [PATCH LINUX 4/6] tty: xuartps: Improve sysrq handling Soren Brinkmann
2016-01-12 1:41 ` [PATCH LINUX 5/6] tty: xuartps: Remove '_OFFSET' suffix from #defines Soren Brinkmann
2016-01-12 1:41 ` [PATCH LINUX 6/6] tty: xuartps: Consolidate TX handling Soren Brinkmann
2016-02-02 5:55 ` [PATCH LINUX 0/6] Second part of xuartps fixes Sören Brinkmann
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