From: Graf Yang <graf.yang@analog.com>
Date: Mon, 20 Apr 2009 09:20:58 +0000 (+0000)
Subject: Blackfin: fix bug found by traps test case 21
X-Git-Tag: v2.6.31-rc1~361^2~54
X-Git-Url: http://bbs.cooldavid.org/git/?a=commitdiff_plain;h=4b402e3a54a46505692ec8215231e2ede46a4aeb;p=net-next-2.6.git

Blackfin: fix bug found by traps test case 21

The traps test case 21 "exception 0x3f: l1_instruction_access" would make
the kernel panic on BF533's because we end up calling show_stack()
infinitely.

Signed-off-by: Graf Yang <graf.yang@analog.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>
Signed-off-by: Bryan Wu <cooloney@kernel.org>
---

diff --git a/arch/blackfin/mm/isram-driver.c b/arch/blackfin/mm/isram-driver.c
index 22913e7a181..c080e70f98b 100644
--- a/arch/blackfin/mm/isram-driver.c
+++ b/arch/blackfin/mm/isram-driver.c
@@ -125,7 +125,7 @@ static bool isram_check_addr(const void *addr, size_t n)
 {
 	if ((addr >= (void *)L1_CODE_START) &&
 	    (addr < (void *)(L1_CODE_START + L1_CODE_LENGTH))) {
-		if ((addr + n) >= (void *)(L1_CODE_START + L1_CODE_LENGTH)) {
+		if ((addr + n) > (void *)(L1_CODE_START + L1_CODE_LENGTH)) {
 			show_stack(NULL, NULL);
 			printk(KERN_ERR "isram_memcpy: copy involving %p length "
 					"(%zu) too long\n", addr, n);