From: Chuck Lever <chuck.lever@oracle.com>
Date: Thu, 20 Dec 2007 19:54:27 +0000 (-0500)
Subject: SUNRPC: Fix use of copy_to_user() in gss_pipe_upcall()
X-Git-Tag: v2.6.25-rc1~1146^2~29
X-Git-Url: http://git.openpandora.org/cgi-bin/gitweb.cgi?a=commitdiff_plain;h=7df089952fca41cb336733e1167c0a25e5a025d8;p=pandora-kernel.git

SUNRPC: Fix use of copy_to_user() in gss_pipe_upcall()

The gss_pipe_upcall() function expects the copy_to_user() function to
return a negative error value if the call fails, but copy_to_user()
returns an unsigned long number of bytes that couldn't be copied.

Can rpc_pipefs actually retry a partially completed upcall read?  If
not, then gss_pipe_upcall() should punt any partial read, just like the
upcall logic in net/sunrpc/cache.c.

Signed-off-by: Chuck Lever <chuck.lever@oracle.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
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