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

[Dmitry Antipov]

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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