linux-kernel - Re: [PATCH] serial: apbuart: Let boards without apbuart boot

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Date:	Sun, 16 May 2010 14:20:38 +0400
From:	Anton Vorontsov <cbouatmailru@...il.com>
To:	Miguel Ojeda <miguel.ojeda.sandonis@...il.com>
Cc:	David Miller <davem@...emloft.net>,
	Greg Kroah-Hartman <gregkh@...e.de>,
	Kristoffer Glembo <kristoffer@...sler.com>,
	linux-kernel@...r.kernel.org
Subject: Re: [PATCH] serial: apbuart: Let boards without apbuart boot

On Sun, May 16, 2010 at 10:41:50AM +0200, Miguel Ojeda wrote:
> On Fri, May 14, 2010 at 4:19 PM, Anton Vorontsov <avorontsov@...sta.com> 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.

Hm, and my patch is in Greg's tree already...

Greg, if it didn't make it anywhere further your tree, please
drop it in favour of Miguel's patch, Miguel was the first who
sent a fix for this problem.

Thanks,

> >  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@...sta.com>
> > ---
> >  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

-- 
Anton Vorontsov
email: cbouatmailru@...il.com
irc://irc.freenode.net/bd2
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