summaryrefslogtreecommitdiffstats
path: root/include/linux/cfag12864b.h
diff options
context:
space:
mode:
authorMiguel Ojeda <maxextreme@gmail.com>2007-02-20 13:58:00 -0800
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-02-20 17:10:14 -0800
commit34173a4aad7a641e72b70f9927ca797746fbce69 (patch)
treee09d2fd33dc6e14d4b76210e471c47e8fed7b2a1 /include/linux/cfag12864b.h
parente627432c2948d500669a6c4522f22b66f5118d64 (diff)
downloadop-kernel-dev-34173a4aad7a641e72b70f9927ca797746fbce69.zip
op-kernel-dev-34173a4aad7a641e72b70f9927ca797746fbce69.tar.gz
[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/cfag12864b.h')
-rw-r--r--include/linux/cfag12864b.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/include/linux/cfag12864b.h b/include/linux/cfag12864b.h
index 0bc45e6..1605dd8 100644
--- a/include/linux/cfag12864b.h
+++ b/include/linux/cfag12864b.h
@@ -73,5 +73,10 @@ extern void cfag12864b_disable(void);
*/
extern unsigned char cfag12864b_isenabled(void);
+/*
+ * Is the module inited?
+ */
+extern unsigned char cfag12864b_isinited(void);
+
#endif /* _CFAG12864B_H_ */
OpenPOWER on IntegriCloud