update to 2.6.31-rc4

nuke upstream patch.

svn path=/dists/trunk/linux-2.6/; revision=13998

debian/changelog

@@ -1,4 +1,4 @@
-linux-2.6 (2.6.31~rc3-1~experimental.1) UNRELEASED; urgency=low
+linux-2.6 (2.6.31~rc4-1~experimental.1) UNRELEASED; urgency=low
 
   * New upstream release.
     - support for W83627DHG-P (closes: #535646).

debian/patches/bugfix/all/n_tty-fix-echo-race.patch

@@ -1,49 +0,0 @@
-commit 807708844979ba8c6d5717345a8608454992696d
-Author: Alan Cox <alan@linux.intel.com>
-Date:   Thu Jul 16 16:07:03 2009 +0100
-
-    n_tty: Fix echo race
-    
-    If a tty in N_TTY mode with echo enabled manages to get itself into a state
-    where
-    	- echo characters are pending
-    	- FASYNC is enabled
-    	- tty_write_wakeup is called from either
-    		- a device write path (pty)
-    		- an IRQ (serial)
-    
-    then it either deadlocks or explodes taking a mutex in the IRQ path.
-    
-    On the serial side it is almost impossible to reproduce because you have to
-    go from a full serial port to a near empty one with echo characters
-    pending. The pty case happens to have become possible to trigger using
-    emacs and ptys, the pty changes having created a scenario which shows up
-    this bug.
-    
-    The code path is
-    
-    	n_tty:process_echoes() (takes mutex)
-    	tty_io:tty_put_char()
-    	pty:pty_write  (or serial paths)
-    	tty_wakeup     (from pty_write or serial IRQ)
-    	n_tty_write_wakeup()
-    	process_echoes()
-    	*KABOOM*
-    
-    Signed-off-by: Alan Cox <alan@linux.intel.com>
-    Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-
-diff --git a/drivers/char/n_tty.c b/drivers/char/n_tty.c
-index 94a5d50..ff47907 100644
---- a/drivers/char/n_tty.c
-+++ b/drivers/char/n_tty.c
-@@ -1331,9 +1331,6 @@ handle_newline:
- 
- static void n_tty_write_wakeup(struct tty_struct *tty)
- {
--	/* Write out any echoed characters that are still pending */
--	process_echoes(tty);
--
- 	if (tty->fasync && test_and_clear_bit(TTY_DO_WRITE_WAKEUP, &tty->flags))
- 		kill_fasync(&tty->fasync, SIGIO, POLL_OUT);
- }

debian/patches/series/base

@@ -30,4 +30,3 @@
 #+ bugfix/arm/export-flush_dcache_page.patch
 + bugfix/all/add-missing-mtd-include.patch
 + bugfix/mips/fix-smp.patch
-+ bugfix/all/n_tty-fix-echo-race.patch