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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 /drivers/auxdisplay/ks0108.c
parente627432c2948d500669a6c4522f22b66f5118d64 (diff)
downloadlinux-34173a4aad7a641e72b70f9927ca797746fbce69.tar.bz2
[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 'drivers/auxdisplay/ks0108.c')
-rw-r--r--drivers/auxdisplay/ks0108.c12
1 files changed, 12 insertions, 0 deletions
diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
index a637575b9106..e6c3646ef18c 100644
--- a/drivers/auxdisplay/ks0108.c
+++ b/drivers/auxdisplay/ks0108.c
@@ -111,6 +111,17 @@ 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: