I was fixing this issue some time ago.
With CONFIG_VT (drivers/char/vt.c) enabled and a USB HID keyboard connected, we
were seeing bad pointer dereferences in drivers/char/keyboard.c
In function kbd_keycode vc_cons[fg_console].d was un-initialized .
static void kbd_keycode(unsigned int keycode, int down, int hw_raw)
{
--snip--
struct vc_data *vc = vc_cons[fg_console].d;
--snip--
tty = vc->vc_tty;
--snip--
}
The workaround, almost any arch does is to initialize conswitchp with the dummy
console.
conswitchp = &dummy_con;
The dummy console gets automatically selected if there is no other suitable
console (VGA).
The bit we were missing is simply this fix.
Best regards,
Michael
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>-----Original Message-----
>From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Pekka
>Enberg
>Sent: Montag, 21. Mai 2007 13:40
>To: Bryan Wu
>Cc: [EMAIL PROTECTED]; [EMAIL PROTECTED]; linux-
>[EMAIL PROTECTED]; Michael Hennerich
>Subject: Re: [PATCH 12/32] Blackfin arch: Fix bug using usb keyboard
>crashes kernel
>
>Hi Bryan,
>
>On 5/21/07, Bryan Wu <[EMAIL PROTECTED]> wrote:
>> +#ifdef CONFIG_DUMMY_CONSOLE
>> + conswitchp = &dummy_con;
>> +#endif
>> cclk = get_cclk();
>> sclk = get_sclk();
>
>This patch has no changelog. While it is probably apparent to you why
>this fixes a crash when using an USB keyboard, it would be nice for
>the rest of us to know which crash it fixes and why.
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