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>
49 lines
1.6 KiB
C
49 lines
1.6 KiB
C
/*
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* Filename: ks0108.h
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* Version: 0.1.0
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* Description: ks0108 LCD Controller 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: 2006-10-31
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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 _KS0108_H_
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#define _KS0108_H_
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/* Write a byte to the data port */
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extern void ks0108_writedata(unsigned char byte);
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/* Write a byte to the control port */
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extern void ks0108_writecontrol(unsigned char byte);
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/* Set the controller's current display state (0..1) */
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extern void ks0108_displaystate(unsigned char state);
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/* Set the controller's current startline (0..63) */
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extern void ks0108_startline(unsigned char startline);
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/* Set the controller's current address (0..63) */
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extern void ks0108_address(unsigned char address);
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/* Set the controller's current page (0..7) */
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extern void ks0108_page(unsigned char page);
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/* Is the module inited? */
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extern unsigned char ks0108_isinited(void);
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#endif /* _KS0108_H_ */
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