From: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Date: Fri, 17 Aug 2012 18:32:28 +0000 (-0700)
Subject: 3.5-stable patches
X-Git-Tag: v3.5.3~4
X-Git-Url: http://git.ipfire.org/?a=commitdiff_plain;h=c012255e5d2c239fb4ba7ad61f61440e43907f24;p=thirdparty%2Fkernel%2Fstable-queue.git

3.5-stable patches

added patches:
	pmac_zilog-kdb-fix-console-poll-hook-to-return-instead-of-loop.patch
---

diff --git a/queue-3.5/pmac_zilog-kdb-fix-console-poll-hook-to-return-instead-of-loop.patch b/queue-3.5/pmac_zilog-kdb-fix-console-poll-hook-to-return-instead-of-loop.patch
new file mode 100644
index 00000000000..4cba462f4b2
--- /dev/null
+++ b/queue-3.5/pmac_zilog-kdb-fix-console-poll-hook-to-return-instead-of-loop.patch
@@ -0,0 +1,47 @@
+From 38f8eefccf3a23c4058a570fa2938a4f553cf8e0 Mon Sep 17 00:00:00 2001
+From: Jason Wessel <jason.wessel@windriver.com>
+Date: Sun, 12 Aug 2012 07:16:43 -0500
+Subject: pmac_zilog,kdb: Fix console poll hook to return instead of loop
+
+From: Jason Wessel <jason.wessel@windriver.com>
+
+commit 38f8eefccf3a23c4058a570fa2938a4f553cf8e0 upstream.
+
+kdb <-> kgdb transitioning does not work properly with this UART
+driver because the get character routine loops indefinitely as opposed
+to returning NO_POLL_CHAR per the expectation of the KDB I/O driver
+API.
+
+The symptom is a kernel hang when trying to switch debug modes.
+
+Signed-off-by: Jason Wessel <jason.wessel@windriver.com>
+Cc: Alan Cox <alan@linux.intel.com>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+
+---
+ drivers/tty/serial/pmac_zilog.c |   12 +++++++++---
+ 1 file changed, 9 insertions(+), 3 deletions(-)
+
+--- a/drivers/tty/serial/pmac_zilog.c
++++ b/drivers/tty/serial/pmac_zilog.c
+@@ -1348,10 +1348,16 @@ static int pmz_verify_port(struct uart_p
+ static int pmz_poll_get_char(struct uart_port *port)
+ {
+ 	struct uart_pmac_port *uap = (struct uart_pmac_port *)port;
++	int tries = 2;
+ 
+-	while ((read_zsreg(uap, R0) & Rx_CH_AV) == 0)
+-		udelay(5);
+-	return read_zsdata(uap);
++	while (tries) {
++		if ((read_zsreg(uap, R0) & Rx_CH_AV) != 0)
++			return read_zsdata(uap);
++		if (tries--)
++			udelay(5);
++	}
++
++	return NO_POLL_CHAR;
+ }
+ 
+ static void pmz_poll_put_char(struct uart_port *port, unsigned char c)
diff --git a/queue-3.5/series b/queue-3.5/series
index 2335a0b9e13..545c61b23b0 100644
--- a/queue-3.5/series
+++ b/queue-3.5/series
@@ -42,3 +42,4 @@ kvm-x86-apply-kvmclock-offset-to-guest-wall-clock-time.patch
 kvm-vmx-fix-ds-es-corruption-on-i386-with-preemption.patch
 kvm-x86-emulator-fix-byte-sized-movzx-movsx.patch
 kvm-vmx-fix-kvm_set_sregs-with-big-real-mode-segments.patch
+pmac_zilog-kdb-fix-console-poll-hook-to-return-instead-of-loop.patch