X-Git-Url: http://pilppa.org/gitweb/gitweb.cgi?a=blobdiff_plain;f=fs%2Fioctl.c;h=8c90cbc903fa812e562984dab11ccc4e9212f2d2;hb=dda034bcb51a0a28318046d74d664e0fc5f7d1d4;hp=479c1038ed4a4f7d3354e5939f6eae6a910e1d4f;hpb=a9deecba19b8f384d97f82c75379da48bccb2588;p=linux-2.6-omap-h63xx.git

diff --git a/fs/ioctl.c b/fs/ioctl.c
index 479c1038ed4..8c90cbc903f 100644
--- a/fs/ioctl.c
+++ b/fs/ioctl.c
@@ -12,6 +12,7 @@
 #include <linux/fs.h>
 #include <linux/security.h>
 #include <linux/module.h>
+#include <linux/kallsyms.h>
 
 #include <asm/uaccess.h>
 #include <asm/ioctls.h>
@@ -20,6 +21,7 @@ static long do_ioctl(struct file *filp, unsigned int cmd,
 		unsigned long arg)
 {
 	int error = -ENOTTY;
+	void *f;
 
 	if (!filp->f_op)
 		goto out;
@@ -29,10 +31,16 @@ static long do_ioctl(struct file *filp, unsigned int cmd,
 		if (error == -ENOIOCTLCMD)
 			error = -EINVAL;
 		goto out;
-	} else if (filp->f_op->ioctl) {
+	} else if ((f = filp->f_op->ioctl)) {
 		lock_kernel();
-		error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
-					  filp, cmd, arg);
+		if (!filp->f_op->ioctl) {
+			printk("%s: ioctl %p disappeared\n", __FUNCTION__, f);
+			print_symbol("symbol: %s\n", (unsigned long)f);
+			dump_stack();
+		} else {
+			error = filp->f_op->ioctl(filp->f_path.dentry->d_inode,
+						  filp, cmd, arg);
+		}
 		unlock_kernel();
 	}