[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>

diff --git a/drivers/auxdisplay/cfag12864b.c b/drivers/auxdisplay/cfag12864b.c
index 889583d..cb44cb4 100644 (file)
--- a/drivers/auxdisplay/cfag12864b.c
+++ b/drivers/auxdisplay/cfag12864b.c
@@ -311,6 +311,17 @@ EXPORT_SYMBOL_GPL(cfag12864b_enable);
 EXPORT_SYMBOL_GPL(cfag12864b_disable);
 EXPORT_SYMBOL_GPL(cfag12864b_isenabled);
 
+/*
+ * Is the module inited?
+ */
+
+static unsigned char cfag12864b_inited;
+unsigned char cfag12864b_isinited(void)
+{
+       return cfag12864b_inited;
+}
+EXPORT_SYMBOL_GPL(cfag12864b_isinited);
+
 /*
  * Module Init & Exit
  */
@@ -319,6 +330,13 @@ static int __init cfag12864b_init(void)
 {
        int ret = -EINVAL;
 
+       /* ks0108_init() must be called first */
+       if (!ks0108_isinited()) {
+               printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
+                       "ks0108 is not initialized\n");
+               goto none;
+       }
+
        if (PAGE_SIZE < CFAG12864B_SIZE) {
                printk(KERN_ERR CFAG12864B_NAME ": ERROR: "
                        "page size (%i) < cfag12864b size (%i)\n",
@@ -354,6 +372,7 @@ static int __init cfag12864b_init(void)
        cfag12864b_clear();
        cfag12864b_on();
 
+       cfag12864b_inited = 1;
        return 0;
 
 cachealloced:

diff --git a/drivers/auxdisplay/cfag12864bfb.c b/drivers/auxdisplay/cfag12864bfb.c
index 94765e7..66fafbb 100644 (file)
--- a/drivers/auxdisplay/cfag12864bfb.c
+++ b/drivers/auxdisplay/cfag12864bfb.c
@@ -137,7 +137,14 @@ static struct platform_device *cfag12864bfb_device;
 
 static int __init cfag12864bfb_init(void)
 {
-       int ret;
+       int ret = -EINVAL;
+
+       /* cfag12864b_init() must be called first */
+       if (!cfag12864b_isinited()) {
+               printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
+                       "cfag12864b is not initialized\n");
+               goto none;
+       }
 
        if (cfag12864b_enable()) {
                printk(KERN_ERR CFAG12864BFB_NAME ": ERROR: "
@@ -162,6 +169,7 @@ static int __init cfag12864bfb_init(void)
                }
        }
 
+none:
        return ret;
 }
 

diff --git a/drivers/auxdisplay/ks0108.c b/drivers/auxdisplay/ks0108.c
index a637575..e6c3646 100644 (file)
--- a/drivers/auxdisplay/ks0108.c
+++ b/drivers/auxdisplay/ks0108.c
@@ -110,6 +110,17 @@ EXPORT_SYMBOL_GPL(ks0108_startline);
 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:

diff --git a/include/linux/cfag12864b.h b/include/linux/cfag12864b.h
index 0bc45e6..1605dd8 100644 (file)
--- 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_ */
 

diff --git a/include/linux/ks0108.h b/include/linux/ks0108.h
index 8047d4b..a2c54ac 100644 (file)
--- 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_ */