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Subject[PATCH v2 4/6] atmel_serial: Fix bugs in probe() error path and remove()
Date
When an error happens in probe(), the clocks should be disabled, but
only if the port isn't already used as a console.

In remove(), the port struct shouldn't be freed because it's defined
statically.

Signed-off-by: Haavard Skinnemoen <hskinnemoen@atmel.com>
---
drivers/serial/atmel_serial.c | 39 +++++++++++++++++++++++++++++----------
1 files changed, 29 insertions(+), 10 deletions(-)

diff --git a/drivers/serial/atmel_serial.c b/drivers/serial/atmel_serial.c
index a6b3828..d2b4b0a 100644
--- a/drivers/serial/atmel_serial.c
+++ b/drivers/serial/atmel_serial.c
@@ -941,8 +941,18 @@ static int __init atmel_late_console_init(void)

core_initcall(atmel_late_console_init);

+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+ return port->cons && port->cons->index == port->line;
+}
+
#else
#define ATMEL_CONSOLE_DEVICE NULL
+
+static inline bool atmel_is_console_port(struct uart_port *port)
+{
+ return false;
+}
#endif

static struct uart_driver atmel_uart = {
@@ -1000,9 +1010,19 @@ static int __devinit atmel_serial_probe(struct platform_device *pdev)
atmel_init_port(port, pdev);

ret = uart_add_one_port(&atmel_uart, &port->uart);
- if (!ret) {
- device_init_wakeup(&pdev->dev, 1);
- platform_set_drvdata(pdev, port);
+ if (ret)
+ goto err_add_port;
+
+ device_init_wakeup(&pdev->dev, 1);
+ platform_set_drvdata(pdev, port);
+
+ return 0;
+
+err_add_port:
+ if (!atmel_is_console_port(&port->uart)) {
+ clk_disable(port->clk);
+ clk_put(port->clk);
+ port->clk = NULL;
}

return ret;
@@ -1014,16 +1034,15 @@ static int __devexit atmel_serial_remove(struct platform_device *pdev)
struct atmel_uart_port *atmel_port = (struct atmel_uart_port *)port;
int ret = 0;

- clk_disable(atmel_port->clk);
- clk_put(atmel_port->clk);
-
device_init_wakeup(&pdev->dev, 0);
platform_set_drvdata(pdev, NULL);

- if (port) {
- ret = uart_remove_one_port(&atmel_uart, port);
- kfree(port);
- }
+ ret = uart_remove_one_port(&atmel_uart, port);
+
+ /* "port" is allocated statically, so we shouldn't free it */
+
+ clk_disable(atmel_port->clk);
+ clk_put(atmel_port->clk);

return ret;
}
--
1.5.3.4


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