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[PATCH] cfag12864b: fix crash when built-in and no parport present

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The problem comes when ks0108/cfag12864b are built-in and no parallel port is
present.  ks0108_init() is called first, as it should be, but fails to load
(as there is no parallel port to use).

After that, cfag12864b_init() gets called, without knowing anything about
ks0108 failed, and calls ks0108_writecontrol(), which dereferences an
uninitialized pointer.

Init order is OK, I think.  The problem is how to stop cfag12864b_init() being
called if ks0108 failed to load.  modprobe does it for us, but, how when
built-in?

Signed-off-by: Miguel Ojeda Sandonis <maxextreme@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miguel Ojeda
2007-02-20 13:58:00 -08:00
committed by Linus Torvalds
parent e627432c29
commit 34173a4aad
5 changed files with 48 additions and 1 deletions
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12
drivers/auxdisplay/ks0108.c
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@@ -110,6 +110,17 @@ EXPORT_SYMBOL_GPL(ks0108_startline);
EXPORT_SYMBOL_GPL(ks0108_address);
EXPORT_SYMBOL_GPL(ks0108_page);
/*
* Is the module inited?
*/
static unsigned char ks0108_inited;
unsigned char ks0108_isinited(void)
{
return ks0108_inited;
}
EXPORT_SYMBOL_GPL(ks0108_isinited);
/*
* Module Init & Exit
*/
@@ -142,6 +153,7 @@ static int __init ks0108_init(void)
goto registered;
}
ks0108_inited = 1;
return 0;
registered: