diff options
| author | Vineet Gupta <Vineet.Gupta1@synopsys.com> | 2013-01-11 11:50:20 +0530 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2013-01-15 22:15:17 -0800 |
| commit | 026bb292c4018dd77186dee1fcb73c9067e69b89 (patch) | |
| tree | 2dd76feb11e1e40c613986c6e69805354fd372da | |
| parent | e9ea096dd2259454e0d09d0b0445fe8f0117add4 (diff) | |
serial/arc-uart: Don't index with -ve platform_device->id
probe routine could index into port[] with -ve index. The check in
arc_uart_init_one() was too late.
This came to light when trying to port driver to CONFIG_OF, where
bydefault of-core code sets -ve platform dev id and in absence of
DT serial aliases, driver would use the -ve index.
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Cc: Alan Cox <alan@linux.intel.com>
Cc: Jiri Slaby <jslaby@suse.cz>
Cc: linux-serial@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | drivers/tty/serial/arc_uart.c | 29 |
1 files changed, 15 insertions, 14 deletions
diff --git a/drivers/tty/serial/arc_uart.c b/drivers/tty/serial/arc_uart.c index 3e0b3fac6a0..8089dc355ac 100644 --- a/drivers/tty/serial/arc_uart.c +++ b/drivers/tty/serial/arc_uart.c @@ -526,15 +526,11 @@ static struct uart_ops arc_serial_pops = { }; static int -arc_uart_init_one(struct platform_device *pdev, struct arc_uart_port *uart) +arc_uart_init_one(struct platform_device *pdev, int dev_id) { struct resource *res, *res2; unsigned long *plat_data; - - if (pdev->id < 0 || pdev->id >= CONFIG_SERIAL_ARC_NR_PORTS) { - dev_err(&pdev->dev, "Wrong uart platform device id.\n"); - return -ENOENT; - } + struct arc_uart_port *uart = &arc_uart_ports[dev_id]; plat_data = ((unsigned long *)(pdev->dev.platform_data)); uart->baud = plat_data[0]; @@ -557,7 +553,7 @@ arc_uart_init_one(struct platform_device *pdev, struct arc_uart_port *uart) uart->port.dev = &pdev->dev; uart->port.iotype = UPIO_MEM; uart->port.flags = UPF_BOOT_AUTOCONF; - uart->port.line = pdev->id; + uart->port.line = dev_id; uart->port.ops = &arc_serial_pops; uart->port.uartclk = plat_data[1]; @@ -657,9 +653,14 @@ static struct __initdata console arc_early_serial_console = { static int arc_serial_probe_earlyprintk(struct platform_device *pdev) { - arc_early_serial_console.index = pdev->id; + int dev_id = pdev->id < 0 ? 0 : pdev->id; + int rc; - arc_uart_init_one(pdev, &arc_uart_ports[pdev->id]); + arc_early_serial_console.index = dev_id; + + rc = arc_uart_init_one(pdev, dev_id); + if (rc) + panic("early console init failed\n"); arc_serial_console_setup(&arc_early_serial_console, NULL); @@ -675,18 +676,18 @@ static int arc_serial_probe_earlyprintk(struct platform_device *pdev) static int arc_serial_probe(struct platform_device *pdev) { - struct arc_uart_port *uart; - int rc; + int rc, dev_id; if (is_early_platform_device(pdev)) return arc_serial_probe_earlyprintk(pdev); - uart = &arc_uart_ports[pdev->id]; - rc = arc_uart_init_one(pdev, uart); + dev_id = pdev->id < 0 ? 0 : pdev->id; + rc = arc_uart_init_one(pdev, dev_id); if (rc) return rc; - return uart_add_one_port(&arc_uart_driver, &uart->port); + rc = uart_add_one_port(&arc_uart_driver, &arc_uart_ports[dev_id].port); + return rc; } static int arc_serial_remove(struct platform_device *pdev) |