[3.8.y.z extended stable] Patch "[media] fc2580: fix tuning failure on 32-bit arch" has been added to staging queue

[Kamal Mostafa]

This is a note to let you know that I have just added a patch titled

    [media] fc2580: fix tuning failure on 32-bit arch

to the linux-3.8.y-queue branch of the 3.8.y.z extended stable tree 
which can be found at:

 http://kernel.ubuntu.com/git?p=ubuntu/linux.git;a=shortlog;h=refs/heads/linux-3.8.y-queue

This patch is scheduled to be released in version 3.8.13.25.

If you, or anyone else, feels it should not be added to this tree, please 
reply to this email.

For more information about the 3.8.y.z tree, see
https://wiki.ubuntu.com/Kernel/Dev/ExtendedStable

Thanks.
-Kamal

------

>From a4eceeb8d50d56407beb80623945e0e56b497c15 Mon Sep 17 00:00:00 2001
From: Antti Palosaari <crope at iki.fi>
Date: Thu, 10 Apr 2014 21:18:16 -0300
Subject: [PATCH 02/66] [media] fc2580: fix tuning failure on 32-bit arch

commit 8845cc6415ec28ef8d57b3fb81c75ef9bce69c5f upstream.

There was some frequency calculation overflows which caused tuning
failure on 32-bit architecture. Use 64-bit numbers where needed in
order to avoid calculation overflows.

Thanks for the Finnish person, who asked remain anonymous, reporting,
testing and suggesting the fix.

Signed-off-by: Antti Palosaari <crope at iki.fi>
Signed-off-by: Mauro Carvalho Chehab <m.chehab at samsung.com>
Signed-off-by: Kamal Mostafa <kamal at canonical.com>
---
 drivers/media/tuners/fc2580.c      | 6 +++---
 drivers/media/tuners/fc2580_priv.h | 1 +
 2 files changed, 4 insertions(+), 3 deletions(-)

diff --git a/drivers/media/tuners/fc2580.c b/drivers/media/tuners/fc2580.c
index 81f38aa..dbf8dfe 100644
--- a/drivers/media/tuners/fc2580.c
+++ b/drivers/media/tuners/fc2580.c
@@ -178,7 +178,7 @@ static int fc2580_set_params(struct dvb_frontend *fe)

 	f_ref = 2UL * priv->cfg->clock / r_val;
 	n_val = div_u64_rem(f_vco, f_ref, &k_val);
-	k_val_reg = 1UL * k_val * (1 << 20) / f_ref;
+	k_val_reg = div_u64(1ULL * k_val * (1 << 20), f_ref);

 	ret = fc2580_wr_reg(priv, 0x18, r18_val | ((k_val_reg >> 16) & 0xff));
 	if (ret < 0)
@@ -331,8 +331,8 @@ static int fc2580_set_params(struct dvb_frontend *fe)
 	if (ret < 0)
 		goto err;

-	ret = fc2580_wr_reg(priv, 0x37, 1UL * priv->cfg->clock * \
-			fc2580_if_filter_lut[i].mul / 1000000000);
+	ret = fc2580_wr_reg(priv, 0x37, div_u64(1ULL * priv->cfg->clock *
+			fc2580_if_filter_lut[i].mul, 1000000000));
 	if (ret < 0)
 		goto err;

diff --git a/drivers/media/tuners/fc2580_priv.h b/drivers/media/tuners/fc2580_priv.h
index be38a9e..646c994 100644
--- a/drivers/media/tuners/fc2580_priv.h
+++ b/drivers/media/tuners/fc2580_priv.h
@@ -22,6 +22,7 @@
 #define FC2580_PRIV_H

 #include "fc2580.h"
+#include <linux/math64.h>

 struct fc2580_reg_val {
 	u8 reg;
--
1.9.1