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34173a4aad
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>
83 lines
2.1 KiB
C
83 lines
2.1 KiB
C
/*
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* Filename: cfag12864b.h
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* Version: 0.1.0
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* Description: cfag12864b LCD driver header
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* License: GPLv2
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*
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* Author: Copyright (C) Miguel Ojeda Sandonis <maxextreme@gmail.com>
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* Date: 2006-10-12
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
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*
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*/
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#ifndef _CFAG12864B_H_
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#define _CFAG12864B_H_
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#define CFAG12864B_WIDTH (128)
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#define CFAG12864B_HEIGHT (64)
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#define CFAG12864B_CONTROLLERS (2)
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#define CFAG12864B_PAGES (8)
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#define CFAG12864B_ADDRESSES (64)
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#define CFAG12864B_SIZE ((CFAG12864B_CONTROLLERS) * \
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(CFAG12864B_PAGES) * \
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(CFAG12864B_ADDRESSES))
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/*
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* The driver will blit this buffer to the LCD
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*
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* Its size is CFAG12864B_SIZE.
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*/
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extern unsigned char * cfag12864b_buffer;
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/*
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* Get the refresh rate of the LCD
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*
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* Returns the refresh rate (hertzs).
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*/
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extern unsigned int cfag12864b_getrate(void);
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/*
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* Enable refreshing
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*
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* Returns 0 if successful (anyone was using it),
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* or != 0 if failed (someone is using it).
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*/
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extern unsigned char cfag12864b_enable(void);
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/*
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* Disable refreshing
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*
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* You should call this only when you finish using the LCD.
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*/
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extern void cfag12864b_disable(void);
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/*
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* Is enabled refreshing? (is anyone using the module?)
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*
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* Returns 0 if refreshing is not enabled (anyone is using it),
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* or != 0 if refreshing is enabled (someone is using it).
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*
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* Useful for buffer read-only modules.
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*/
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extern unsigned char cfag12864b_isenabled(void);
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/*
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* Is the module inited?
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*/
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extern unsigned char cfag12864b_isinited(void);
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#endif /* _CFAG12864B_H_ */
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