serial: cpm_uart: Don't request IRQ too early for console port

commit 30963b2f75bfdbbcf1cc5d80bf88fec7aaba808d upstream.

The following message is seen during boot and the activation of
console port gets delayed until normal serial ports activation.

[    0.001346] irq: no irq domain found for pic@930 !

The console port doesn't need irq, perform irq reservation later,
during cpm_uart probe.

While at it, don't use NO_IRQ but 0 which is the value returned
by irq_of_parse_and_map() in case of error. By chance powerpc's
NO_IRQ has value 0 but on some architectures it is -1.

Fixes: 14d893fc6846 ("powerpc/8xx: Convert CPM1 interrupt controller to platform_device")
Cc: stable@vger.kernel.org
Signed-off-by: Christophe Leroy <christophe.leroy@csgroup.eu>
Link: https://lore.kernel.org/r/8bed0f30c2e9ef16ae64fb1243a16d54a48eb8da.1664526717.git.christophe.leroy@csgroup.eu
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/tty/serial/cpm_uart/cpm_uart_core.c b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
index db07d6a5d764d60379a9d0617ae103087f2c762e..fa5c4633086e63048615df26f427b2a6b02425f2 100644 (file)
--- a/drivers/tty/serial/cpm_uart/cpm_uart_core.c
+++ b/drivers/tty/serial/cpm_uart/cpm_uart_core.c
@@ -1214,12 +1214,6 @@ static int cpm_uart_init_port(struct device_node *np,
        pinfo->port.fifosize = pinfo->tx_nrfifos * pinfo->tx_fifosize;
        spin_lock_init(&pinfo->port.lock);
 
-       pinfo->port.irq = irq_of_parse_and_map(np, 0);
-       if (pinfo->port.irq == NO_IRQ) {
-               ret = -EINVAL;
-               goto out_pram;
-       }
-
        for (i = 0; i < NUM_GPIOS; i++) {
                struct gpio_desc *gpiod;
 
@@ -1229,7 +1223,7 @@ static int cpm_uart_init_port(struct device_node *np,
 
                if (IS_ERR(gpiod)) {
                        ret = PTR_ERR(gpiod);
-                       goto out_irq;
+                       goto out_pram;
                }
 
                if (gpiod) {
@@ -1255,8 +1249,6 @@ static int cpm_uart_init_port(struct device_node *np,
 
        return cpm_uart_request_port(&pinfo->port);
 
-out_irq:
-       irq_dispose_mapping(pinfo->port.irq);
 out_pram:
        cpm_uart_unmap_pram(pinfo, pram);
 out_mem:
@@ -1436,11 +1428,17 @@ static int cpm_uart_probe(struct platform_device *ofdev)
        /* initialize the device pointer for the port */
        pinfo->port.dev = &ofdev->dev;
 
+       pinfo->port.irq = irq_of_parse_and_map(ofdev->dev.of_node, 0);
+       if (!pinfo->port.irq)
+               return -EINVAL;
+
        ret = cpm_uart_init_port(ofdev->dev.of_node, pinfo);
-       if (ret)
-               return ret;
+       if (!ret)
+               return uart_add_one_port(&cpm_reg, &pinfo->port);
 
-       return uart_add_one_port(&cpm_reg, &pinfo->port);
+       irq_dispose_mapping(pinfo->port.irq);
+
+       return ret;
 }
 
 static int cpm_uart_remove(struct platform_device *ofdev)