ptrace: cleanup arch_ptrace() on cris

Use new 'regno' variable in order to remove redandunt expression and
remove checking @addr less than 0 because @addr is now unsigned.  Also
update 'datap' on PTRACE_GET/SETREGS to fix a bug on arch-v10.

Signed-off-by: Namhyung Kim <namhyung@gmail.com>
Acked-by: Mikael Starvik <starvik@axis.com>
Cc: Jesper Nilsson <jesper.nilsson@axis.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 8 insertions, 9 deletions

diff --git a/arch/cris/arch-v10/kernel/ptrace.c b/arch/cris/arch-v10/kernel/ptrace.c
index d411e024e05f..320065f3cbe5 100644
--- a/arch/cris/arch-v10/kernel/ptrace.c
+++ b/arch/cris/arch-v10/kernel/ptrace.c
@@ -80,6 +80,7 @@ long arch_ptrace(struct task_struct *child, long request,
                  unsigned long addr, unsigned long data)
 {
         int ret;
+        unsigned int regno = addr >> 2;
         unsigned long __user *datap = (unsigned long __user *)data;
 
         switch (request) {
@@ -94,10 +95,10 @@ long arch_ptrace(struct task_struct *child, long request,
                         unsigned long tmp;
 
                         ret = -EIO;
-                        if ((addr & 3) || addr < 0 || addr > PT_MAX << 2)
+                        if ((addr & 3) || regno > PT_MAX)
                                 break;
 
-                        tmp = get_reg(child, addr >> 2);
+                        tmp = get_reg(child, regno);
                         ret = put_user(tmp, datap);
                         break;
                 }
@@ -111,19 +112,17 @@ long arch_ptrace(struct task_struct *child, long request,
                 /* Write the word at location address in the USER area. */
                 case PTRACE_POKEUSR:
                         ret = -EIO;
-                        if ((addr & 3) || addr < 0 || addr > PT_MAX << 2)
+                        if ((addr & 3) || regno > PT_MAX)
                                 break;
 
-                        addr >>= 2;
-
-                        if (addr == PT_DCCR) {
+                        if (regno == PT_DCCR) {
                                 /* don't allow the tracing process to change stuff like
                                  * interrupt enable, kernel/user bit, dma enables etc.
                                  */
                                 data &= DCCR_MASK;
                                 data |= get_reg(child, PT_DCCR) & ~DCCR_MASK;
                         }
-                        if (put_reg(child, addr, data))
+                        if (put_reg(child, regno, data))
                                 break;
                         ret = 0;
                         break;
@@ -142,7 +141,7 @@ long arch_ptrace(struct task_struct *child, long request,
                                         break;
                                 }
                                 
-                                data += sizeof(unsigned long);
+                                datap++;
                         }
 
                         break;
@@ -166,7 +165,7 @@ long arch_ptrace(struct task_struct *child, long request,
                                 }
                                 
                                 put_reg(child, i, tmp);
-                                data += sizeof(unsigned long);
+                                datap++;
                         }
                         
                         break;