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authorMiguel Ojeda <maxextreme@gmail.com>2007-02-21 00:58:00 +0300
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-21 04:10:14 +0300
commit34173a4aad7a641e72b70f9927ca797746fbce69 (patch)
treee09d2fd33dc6e14d4b76210e471c47e8fed7b2a1 /include/linux/ks0108.h
parente627432c2948d500669a6c4522f22b66f5118d64 (diff)
downloadlinux-34173a4aad7a641e72b70f9927ca797746fbce69.tar.xz
[PATCH] cfag12864b: fix crash when built-in and no parport present
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>
Diffstat (limited to 'include/linux/ks0108.h')
-rw-r--r--include/linux/ks0108.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/ks0108.h b/include/linux/ks0108.h
index 8047d4b17bf1..a2c54acceb4e 100644
--- a/include/linux/ks0108.h
+++ b/include/linux/ks0108.h
@@ -43,4 +43,7 @@ extern void ks0108_address(unsigned char address);
/* Set the controller's current page (0..7) */
extern void ks0108_page(unsigned char page);
+/* Is the module inited? */
+extern unsigned char ks0108_isinited(void);
+
#endif /* _KS0108_H_ */