diff mbox

[07/11] ARM: OMAP2: possible division by 0

Message ID 20090414215703.9878.96593.stgit@localhost (mailing list archive)
State Accepted, archived
Headers show

Commit Message

Tony Lindgren April 14, 2009, 9:57 p.m. UTC 
From: Roel Kluin <roel.kluin@gmail.com>

In linus' git tree the functions can be found at:
vi arch/arm/mach-omap2/usb-tusb6010.c +200	- tusb6010_platform_retime()
vi arch/arm/mach-omap2/gpmc.c +94		- gpmc_get_fclk_period()
vi arch/arm/mach-omap2/usb-tusb6010.c +53	- tusb_set_async_mode()
vi arch/arm/mach-omap2/usb-tusb6010.c +111	- tusb_set_sync_mode()

is -ENODEV appropriate when sysclk_ps == 0?

This was found by code analysis, please review.
------------------------------>8-------------8<---------------------------------
gpmc_get_fclk_period() may return 0 when gpmc_l3_clk is not enabled. This is
not checked in tusb6010_platform_retime() nor in tusb_set_async_mode() it
seems. In tusb_set_sync_mode() this may result in a division by zero.

Signed-off-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Tony Lindgren <tony@atomide.com>
---
 arch/arm/mach-omap2/usb-tusb6010.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)


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diff mbox

Patch

diff --git a/arch/arm/mach-omap2/usb-tusb6010.c b/arch/arm/mach-omap2/usb-tusb6010.c
index 15e5090..8df55f4 100644
--- a/arch/arm/mach-omap2/usb-tusb6010.c
+++ b/arch/arm/mach-omap2/usb-tusb6010.c
@@ -187,7 +187,7 @@  int tusb6010_platform_retime(unsigned is_refclk)
 	unsigned	sysclk_ps;
 	int		status;
 
-	if (!refclk_psec)
+	if (!refclk_psec || sysclk_ps == 0)
 		return -ENODEV;
 
 	sysclk_ps = is_refclk ? refclk_psec : TUSB6010_OSCCLK_60;