linux-kernel - [PATCH 3.2 013/104] usb: renesas_usbhs: tidyup original usbhsx_for_each

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Date:   Mon, 12 Mar 2018 03:03:34 +0000
From:   Ben Hutchings <ben@...adent.org.uk>
To:     linux-kernel@...r.kernel.org, stable@...r.kernel.org
CC:     akpm@...ux-foundation.org,
        "Yusuke Goda" <yusuke.goda.sx@...esas.com>,
        "Kuninori Morimoto" <kuninori.morimoto.gx@...esas.com>,
        "Felipe Balbi" <balbi@...com>,
        "Takashi Yoshii" <takashi.yoshii.zj@...esas.com>
Subject: [PATCH 3.2 013/104] usb: renesas_usbhs: tidyup original
 usbhsx_for_each_xxx macro

3.2.101-rc1 review patch.  If anyone has any objections, please let me know.

------------------

From: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>

commit 925403f425a4a9c503f2fc295652647b1eb10d82 upstream.

Current usbhsx_for_each_xxx macro will read out-of-array's
memory after last loop operation.
It was not good C language operation, and the binary which was
compiled by (at least) gcc 4.8.1 is broken
This patch tidyup these issues

Reported-by: Yusuke Goda <yusuke.goda.sx@...esas.com>
Reviewed-by: Takashi Yoshii <takashi.yoshii.zj@...esas.com>
Signed-off-by: Kuninori Morimoto <kuninori.morimoto.gx@...esas.com>
Signed-off-by: Felipe Balbi <balbi@...com>
Signed-off-by: Ben Hutchings <ben@...adent.org.uk>
---
 drivers/usb/renesas_usbhs/mod_gadget.c | 6 +++---
 drivers/usb/renesas_usbhs/mod_host.c   | 6 +++---
 drivers/usb/renesas_usbhs/pipe.h       | 6 +++---
 3 files changed, 9 insertions(+), 9 deletions(-)

--- a/drivers/usb/renesas_usbhs/mod_gadget.c
+++ b/drivers/usb/renesas_usbhs/mod_gadget.c
@@ -76,9 +76,9 @@ struct usbhsg_recip_handle {
 		struct usbhsg_gpriv, mod)
 
 #define __usbhsg_for_each_uep(start, pos, g, i)	\
-	for (i = start, pos = (g)->uep + i;	\
-	     i < (g)->uep_size;			\
-	     i++, pos = (g)->uep + i)
+	for ((i) = start;					\
+	     ((i) < (g)->uep_size) && ((pos) = (g)->uep + (i));	\
+	     (i)++)
 
 #define usbhsg_for_each_uep(pos, gpriv, i)	\
 	__usbhsg_for_each_uep(1, pos, gpriv, i)
--- a/drivers/usb/renesas_usbhs/mod_host.c
+++ b/drivers/usb/renesas_usbhs/mod_host.c
@@ -131,9 +131,9 @@ static const char usbhsh_hcd_name[] = "r
 	__usbhsh_for_each_hpipe(0, pos, hpriv, i)
 
 #define __usbhsh_for_each_udev(start, pos, h, i)	\
-	for (i = start, pos = (h)->udev + i;		\
-	     i < USBHSH_DEVICE_MAX;			\
-	     i++, pos = (h)->udev + i)
+	for ((i) = start;						\
+	     ((i) < USBHSH_DEVICE_MAX) && ((pos) = (h)->udev + (i));	\
+	     (i)++)
 
 #define usbhsh_for_each_udev(pos, hpriv, i)	\
 	__usbhsh_for_each_udev(1, pos, hpriv, i)
--- a/drivers/usb/renesas_usbhs/pipe.h
+++ b/drivers/usb/renesas_usbhs/pipe.h
@@ -54,9 +54,9 @@ struct usbhs_pipe_info {
  * pipe list
  */
 #define __usbhs_for_each_pipe(start, pos, info, i)	\
-	for (i = start, pos = (info)->pipe + i;		\
-	     i < (info)->size;				\
-	     i++, pos = (info)->pipe + i)
+	for ((i) = start;						\
+	     ((i) < (info)->size) && ((pos) = (info)->pipe + (i));	\
+	     (i)++)
 
 #define usbhs_for_each_pipe(pos, priv, i)			\
 	__usbhs_for_each_pipe(1, pos, &((priv)->pipe_info), i)