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serial: 8250_bcm2835aux: Allocate uart_8250_port on stack

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The bcm2835aux UART driver stores a struct uart_8250_port in its private
data even though it's only passed once to serial8250_register_8250_port()
(which copies all relevant data) and becomes obsolete afterwards.
Allocate the struct on the stack instead for simplicity and to conserve
memory.

The driver also initializes a spinlock in the struct which is never used.
Drop that as well.

Signed-off-by: Lukas Wunner <lukas@wunner.de>
Cc: Martin Sperl <kernel@martin.sperl.org>
Reviewed-by: Matthias Brugger <mbrugger@suse.com>
Reviewed-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Tested-by: Nicolas Saenz Julienne <nsaenzjulienne@suse.de>
Link: https://lore.kernel.org/r/421d3aed4c34cc8447ac9c26c320961f1b787f11.1579175223.git.lukas@wunner.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Lukas Wunner 2020-01-16 13:14:04 +01:00 committed by Greg Kroah-Hartman
parent e2f2a994ad
commit 8c3cde5dd6
1 changed files with 15 additions and 18 deletions
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33
drivers/tty/serial/8250/8250_bcm2835aux.c
View File

@ -17,13 +17,13 @@
#include "8250.h" #include "8250.h"
struct bcm2835aux_data { struct bcm2835aux_data {
struct uart_8250_port uart;
struct clk *clk; struct clk *clk;
int line; int line;
}; };
static int bcm2835aux_serial_probe(struct platform_device *pdev) static int bcm2835aux_serial_probe(struct platform_device *pdev)
{ {
struct uart_8250_port up = { };
struct bcm2835aux_data *data; struct bcm2835aux_data *data;
struct resource *res; struct resource *res;
int ret; int ret;
@ -34,17 +34,14 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
return -ENOMEM; return -ENOMEM;
/* initialize data */ /* initialize data */
spin_lock_init(&data->uart.port.lock); up.capabilities = UART_CAP_FIFO | UART_CAP_MINI;
data->uart.capabilities = UART_CAP_FIFO | UART_CAP_MINI; up.port.dev = &pdev->dev;
data->uart.port.dev = &pdev->dev; up.port.regshift = 2;
data->uart.port.regshift = 2; up.port.type = PORT_16550;
data->uart.port.type = PORT_16550; up.port.iotype = UPIO_MEM;
data->uart.port.iotype = UPIO_MEM; up.port.fifosize = 8;
data->uart.port.fifosize = 8; up.port.flags = UPF_SHARE_IRQ | UPF_FIXED_PORT | UPF_FIXED_TYPE |
data->uart.port.flags = UPF_SHARE_IRQ | UPF_SKIP_TEST;
UPF_FIXED_PORT |
UPF_FIXED_TYPE |
UPF_SKIP_TEST;
/* get the clock - this also enables the HW */ /* get the clock - this also enables the HW */
data->clk = devm_clk_get(&pdev->dev, NULL); data->clk = devm_clk_get(&pdev->dev, NULL);
@ -59,7 +56,7 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
ret = platform_get_irq(pdev, 0); ret = platform_get_irq(pdev, 0);
if (ret < 0) if (ret < 0)
return ret; return ret;
data->uart.port.irq = ret; up.port.irq = ret;
/* map the main registers */ /* map the main registers */
res = platform_get_resource(pdev, IORESOURCE_MEM, 0); res = platform_get_resource(pdev, IORESOURCE_MEM, 0);
@ -67,15 +64,15 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
dev_err(&pdev->dev, "memory resource not found"); dev_err(&pdev->dev, "memory resource not found");
return -EINVAL; return -EINVAL;
} }
data->uart.port.membase = devm_ioremap_resource(&pdev->dev, res); up.port.membase = devm_ioremap_resource(&pdev->dev, res);
ret = PTR_ERR_OR_ZERO(data->uart.port.membase); ret = PTR_ERR_OR_ZERO(up.port.membase);
if (ret) if (ret)
return ret; return ret;
/* Check for a fixed line number */ /* Check for a fixed line number */
ret = of_alias_get_id(pdev->dev.of_node, "serial"); ret = of_alias_get_id(pdev->dev.of_node, "serial");
if (ret >= 0) if (ret >= 0)
data->uart.port.line = ret; up.port.line = ret;
/* enable the clock as a last step */ /* enable the clock as a last step */
ret = clk_prepare_enable(data->clk); ret = clk_prepare_enable(data->clk);
@ -90,10 +87,10 @@ static int bcm2835aux_serial_probe(struct platform_device *pdev)
* so we have to multiply the actual clock by 2 * so we have to multiply the actual clock by 2
* to get identical baudrates. * to get identical baudrates.
*/ */
data->uart.port.uartclk = clk_get_rate(data->clk) * 2; up.port.uartclk = clk_get_rate(data->clk) * 2;
/* register the port */ /* register the port */
ret = serial8250_register_8250_port(&data->uart); ret = serial8250_register_8250_port(&up);
if (ret < 0) { if (ret < 0) {
if (ret != -EPROBE_DEFER) if (ret != -EPROBE_DEFER)
dev_err(&pdev->dev, dev_err(&pdev->dev,