[PATCH] 2.6.20-rc4: force fcntl(..., FASYNC) to return -EINVAL when f_op->fasync is NULL

[Dmitry Antipov <antipov@dev.rtsoft.ru>]

Hello,

this is a proposal fix needed to receive an error when the user requests
'fcntl(fd, F_SETFL, FASYNC)' but lower levels are too poor to handle this.

Dmitry

--- .orig-2.6.20-rc4/fs/fcntl.c	2007-01-12 08:27:10.000000000 +0300
+++ 2.6.20-rc4/fs/fcntl.c	2007-01-12 09:56:14.000000000 +0300
@@ -236,11 +236,11 @@

 	lock_kernel();
 	if ((arg ^ filp->f_flags) & FASYNC) {
-		if (filp->f_op && filp->f_op->fasync) {
+		error = -EINVAL;
+		if (filp->f_op && filp->f_op->fasync)
 			error = filp->f_op->fasync(fd, filp, (arg & FASYNC) != 0);
-			if (error < 0)
-				goto out;
-		}
+		if (error < 0)
+			goto out;
 	}

 	filp->f_flags = (arg & SETFL_MASK) | (filp->f_flags & ~SETFL_MASK);
-
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