From 2c58e56096dd011ea43f29a032d19b0e76fe2570 Mon Sep 17 00:00:00 2001 From: Erwan Le Ray Date: Tue, 21 May 2019 17:45:47 +0200 Subject: [PATCH] serial: stm32: fix the get_irq error case Checks the returned values of platform_get_irq() for both required "event" and optional "wakeup" IRQs during probe. This allows the driver probe to be deferred if needed. Removes redundant checks for 'cfg.has_wakeup'. Signed-off-by: Fabien Dessenne Signed-off-by: Erwan Le Ray Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/stm32-usart.c | 34 ++++++++++++++++++++++++++-------- 1 file changed, 26 insertions(+), 8 deletions(-) diff --git a/drivers/tty/serial/stm32-usart.c b/drivers/tty/serial/stm32-usart.c index 1334e42..9c2b04e 100644 --- a/drivers/tty/serial/stm32-usart.c +++ b/drivers/tty/serial/stm32-usart.c @@ -852,12 +852,31 @@ static int stm32_init_port(struct stm32_port *stm32port, port->flags = UPF_BOOT_AUTOCONF; port->ops = &stm32_uart_ops; port->dev = &pdev->dev; - port->irq = platform_get_irq(pdev, 0); + + ret = platform_get_irq(pdev, 0); + if (ret <= 0) { + if (ret != -EPROBE_DEFER) + dev_err(&pdev->dev, "Can't get event IRQ: %d\n", ret); + return ret ? ret : -ENODEV; + } + port->irq = ret; + port->rs485_config = stm32_config_rs485; stm32_init_rs485(port, pdev); - stm32port->wakeirq = platform_get_irq(pdev, 1); + if (stm32port->info->cfg.has_wakeup) { + stm32port->wakeirq = platform_get_irq(pdev, 1); + if (stm32port->wakeirq <= 0 && stm32port->wakeirq != -ENXIO) { + if (stm32port->wakeirq != -EPROBE_DEFER) + dev_err(&pdev->dev, + "Can't get event wake IRQ: %d\n", + stm32port->wakeirq); + return stm32port->wakeirq ? stm32port->wakeirq : + -ENODEV; + } + } + stm32port->fifoen = stm32port->info->cfg.has_fifo; res = platform_get_resource(pdev, IORESOURCE_MEM, 0); @@ -1064,7 +1083,7 @@ static int stm32_serial_probe(struct platform_device *pdev) if (ret) return ret; - if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0) { + if (stm32port->wakeirq > 0) { ret = device_init_wakeup(&pdev->dev, true); if (ret) goto err_uninit; @@ -1094,11 +1113,11 @@ static int stm32_serial_probe(struct platform_device *pdev) return 0; err_wirq: - if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0) + if (stm32port->wakeirq > 0) dev_pm_clear_wake_irq(&pdev->dev); err_nowup: - if (stm32port->info->cfg.has_wakeup && stm32port->wakeirq >= 0) + if (stm32port->wakeirq > 0) device_init_wakeup(&pdev->dev, false); err_uninit: @@ -1112,7 +1131,6 @@ static int stm32_serial_remove(struct platform_device *pdev) struct uart_port *port = platform_get_drvdata(pdev); struct stm32_port *stm32_port = to_stm32_port(port); struct stm32_usart_offsets *ofs = &stm32_port->info->ofs; - struct stm32_usart_config *cfg = &stm32_port->info->cfg; stm32_clr_bits(port, ofs->cr3, USART_CR3_DMAR); @@ -1134,7 +1152,7 @@ static int stm32_serial_remove(struct platform_device *pdev) TX_BUF_L, stm32_port->tx_buf, stm32_port->tx_dma_buf); - if (cfg->has_wakeup && stm32_port->wakeirq >= 0) { + if (stm32_port->wakeirq > 0) { dev_pm_clear_wake_irq(&pdev->dev); device_init_wakeup(&pdev->dev, false); } @@ -1252,7 +1270,7 @@ static void stm32_serial_enable_wakeup(struct uart_port *port, bool enable) struct stm32_usart_config *cfg = &stm32_port->info->cfg; u32 val; - if (!cfg->has_wakeup || stm32_port->wakeirq < 0) + if (stm32_port->wakeirq <= 0) return; if (enable) { -- 2.7.4