Re: [PATCH] serial: apbuart: Let boards without apbuart boot
From: Miguel Ojeda
Date: Sun May 16 2010 - 04:41:58 EST
On Fri, May 14, 2010 at 4:19 PM, Anton Vorontsov <avorontsov@xxxxxxxxxx> wrote:
> This patch fixes the following oops:
>
I sent a patch that fixes that oops too. It is in mm right now. Please check it.
> Unable to handle kernel paging request for data at address 0x00000000
> Faulting instruction address: 0xc016dea8
> Oops: Kernel access of bad area, sig: 11 [#1]
> P1020 RDB
> last sysfs file:
> NIP: c016dea8 LR: c016dea0 CTR: c0010948
> REGS: c033fea0 TRAP: 0300 Not tainted (2.6.34-rc7-00108-g83b5177-dirty)
> [...]
> NIP [c016dea8] grlib_apbuart_configure+0xd0/0x3bc
> LR [c016dea0] grlib_apbuart_configure+0xc8/0x3bc
> Call Trace:
> [c033ff50] [c016dea0] grlib_apbuart_configure+0xc8/0x3bc (unreliable)
> [c033ffa0] [c0316144] apbuart_console_init+0x10/0x34
> [c033ffb0] [c0314a10] console_init+0x40/0x5c
>
> There's no apbuart on P1020 boards, and what's worse, there's no
> clock-frequency property for it. The driver didn't handle this
> case, which resulted in the oops above. Once we fix this, the
> next oops pops up:
>
> Unable to handle kernel paging request for data at address 0x00000030
> Faulting instruction address: 0xc0166ecc
> Oops: Kernel access of bad area, sig: 11 [#1]
> P1020 RDB
> [...]
> NIP [c0166ecc] uart_set_options+0xd0/0x164
> LR [c0166e38] uart_set_options+0x3c/0x164
> Call Trace:
> [c033fef0] [c0330000] 0xc0330000 (unreliable)
> [c033ff50] [c03160dc] apbuart_console_setup+0xa8/0x100
> [c033ff70] [c003d668] register_console+0x338/0x3ec
> [c033ffa0] [c0316154] apbuart_console_init+0x20/0x34
> [c033ffb0] [c0314a10] console_init+0x40/0x5c
> [c033ffc0] [c0300968] start_kernel+0x12c/0x234
> [c033fff0] [c0000398] skpinv+0x2b0/0x2ec
>
> And that one is because the driver tries to register the console
> even if there were no matches in grlib_apbuart_configure().
>
> While at it, also annotate grlib_apbuart_configure() with __init,
> that fixes several section mismatches:
>
> Section mismatch in reference from the function
> grlib_apbuart_configure() to the variable .init.data:apbuart_match
> The function grlib_apbuart_configure() references the variable
> __initdata apbuart_match.
>
> Signed-off-by: Anton Vorontsov <avorontsov@xxxxxxxxxx>
> ---
> drivers/serial/apbuart.c | 19 ++++++++++++++-----
> 1 files changed, 14 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/serial/apbuart.c b/drivers/serial/apbuart.c
> index fe91319..c908734 100644
> --- a/drivers/serial/apbuart.c
> +++ b/drivers/serial/apbuart.c
> @@ -520,11 +520,16 @@ static struct console grlib_apbuart_console = {
> };
>
>
> -static void grlib_apbuart_configure(void);
> +static int __init grlib_apbuart_configure(void);
>
> static int __init apbuart_console_init(void)
> {
> - grlib_apbuart_configure();
> + int ret;
> +
> + ret = grlib_apbuart_configure();
> + if (ret)
> + return ret;
> +
> register_console(&grlib_apbuart_console);
> return 0;
> }
> @@ -593,7 +598,7 @@ static struct of_platform_driver grlib_apbuart_of_driver = {
> };
>
>
> -static void grlib_apbuart_configure(void)
> +static int __init grlib_apbuart_configure(void)
> {
> static int enum_done;
> struct device_node *np, *rp;
> @@ -606,12 +611,14 @@ static void grlib_apbuart_configure(void)
> struct amba_prom_registers *regs;
>
> if (enum_done)
> - return;
> + return -ENODEV;
>
> /* Get bus frequency */
> rp = of_find_node_by_path("/");
> rp = of_get_next_child(rp, NULL);
> prop = of_get_property(rp, "clock-frequency", NULL);
> + if (!prop)
> + return -ENODEV;
> freq_khz = *prop;
>
> line = 0;
> @@ -629,7 +636,7 @@ static void grlib_apbuart_configure(void)
> d = *device;
>
> if (!irqs || !regs)
> - return;
> + return -ENODEV;
>
> grlib_apbuart_nodes[line] = np;
>
> @@ -658,6 +665,8 @@ static void grlib_apbuart_configure(void)
> enum_done = 1;
>
> grlib_apbuart_driver.nr = grlib_apbuart_port_nr = line;
> +
> + return line ? 0 : -ENODEV;
> }
>
> static int __init grlib_apbuart_init(void)
> --
> 1.7.0.5
> --
> To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
> the body of a message to majordomo@xxxxxxxxxxxxxxx
> More majordomo info at http://vger.kernel.org/majordomo-info.html
> Please read the FAQ at http://www.tux.org/lkml/
>
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@xxxxxxxxxxxxxxx
More majordomo info at http://vger.kernel.org/majordomo-info.html
Please read the FAQ at http://www.tux.org/lkml/