Blackfin: kgdb: fix up error return values

The Blackfin kgdb code was all passing back positive errno values when it
really should have been using negative errno values.

Reported-by: Roel Kluin <roel.kluin@gmail.com>
Signed-off-by: Mike Frysinger <vapier@gentoo.org>

1 files changed, 30 insertions, 25 deletions

diff --git a/arch/blackfin/kernel/kgdb.c b/arch/blackfin/kernel/kgdb.c
index b163f6d3330d..c5362b2b9ed1 100644
--- a/arch/blackfin/kernel/kgdb.c
+++ b/arch/blackfin/kernel/kgdb.c
@@ -466,7 +466,7 @@ static int validate_memory_access_address(unsigned long addr, int size)
         int cpu = raw_smp_processor_id();
 
         if (size < 0)
-                return EFAULT;
+                return -EFAULT;
         if (addr >= 0x1000 && (addr + size) <= physical_mem_end)
                 return 0;
         if (addr >= SYSMMR_BASE)
@@ -498,7 +498,7 @@ static int validate_memory_access_address(unsigned long addr, int size)
         if (IN_MEM(addr, size, L2_START, L2_LENGTH))
                 return 0;
 
-        return EFAULT;
+        return -EFAULT;
 }
 
 /*
@@ -508,14 +508,15 @@ static int validate_memory_access_address(unsigned long addr, int size)
 int kgdb_mem2hex(char *mem, char *buf, int count)
 {
         char *tmp;
-        int err = 0;
+        int err;
         unsigned char *pch;
         unsigned short mmr16;
         unsigned long mmr32;
         int cpu = raw_smp_processor_id();
 
-        if (validate_memory_access_address((unsigned long)mem, count))
-                return EFAULT;
+        err = validate_memory_access_address((unsigned long)mem, count);
+        if (err)
+                return err;
 
         /*
          * We use the upper half of buf as an intermediate buffer for the
@@ -533,7 +534,7 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
                                 *tmp++ = *pch++;
                                 tmp -= 2;
                         } else
-                                err = EFAULT;
+                                err = -EFAULT;
                         break;
                 case 4:
                         if ((unsigned int)mem % 4 == 0) {
@@ -545,10 +546,10 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
                                 *tmp++ = *pch++;
                                 tmp -= 4;
                         } else
-                                err = EFAULT;
+                                err = -EFAULT;
                         break;
                 default:
-                        err = EFAULT;
+                        err = -EFAULT;
                 }
         } else if ((cpu == 0 && IN_MEM(mem, count, L1_CODE_START, L1_CODE_LENGTH))
 #ifdef CONFIG_SMP
@@ -557,7 +558,7 @@ int kgdb_mem2hex(char *mem, char *buf, int count)
                 ) {
                 /* access L1 instruction SRAM*/
                 if (dma_memcpy(tmp, mem, count) == NULL)
-                        err = EFAULT;
+                        err = -EFAULT;
         } else
                 err = probe_kernel_read(tmp, mem, count);
 
@@ -585,7 +586,7 @@ int kgdb_ebin2mem(char *buf, char *mem, int count)
         char *tmp_new;
         unsigned short *mmr16;
         unsigned long *mmr32;
-        int err = 0;
+        int err;
         int size = 0;
         int cpu = raw_smp_processor_id();
 
@@ -601,8 +602,9 @@ int kgdb_ebin2mem(char *buf, char *mem, int count)
                 size++;
         }
 
-        if (validate_memory_access_address((unsigned long)mem, size))
-                return EFAULT;
+        err = validate_memory_access_address((unsigned long)mem, size);
+        if (err)
+                return err;
 
         if ((unsigned int)mem >= SYSMMR_BASE) { /*access MMR registers*/
                 switch (size) {
@@ -611,17 +613,17 @@ int kgdb_ebin2mem(char *buf, char *mem, int count)
                                 mmr16 = (unsigned short *)buf;
                                 *(unsigned short *)mem = *mmr16;
                         } else
-                                return EFAULT;
+                                err = -EFAULT;
                         break;
                 case 4:
                         if ((unsigned int)mem % 4 == 0) {
                                 mmr32 = (unsigned long *)buf;
                                 *(unsigned long *)mem = *mmr32;
                         } else
-                                return EFAULT;
+                                err = -EFAULT;
                         break;
                 default:
-                        return EFAULT;
+                        err = -EFAULT;
                 }
         } else if ((cpu == 0 && IN_MEM(mem, count, L1_CODE_START, L1_CODE_LENGTH))
 #ifdef CONFIG_SMP
@@ -630,7 +632,7 @@ int kgdb_ebin2mem(char *buf, char *mem, int count)
                 ) {
                 /* access L1 instruction SRAM */
                 if (dma_memcpy(mem, buf, size) == NULL)
-                        err = EFAULT;
+                        err = -EFAULT;
         } else
                 err = probe_kernel_write(mem, buf, size);
 
@@ -648,10 +650,12 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
         char *tmp_hex;
         unsigned short *mmr16;
         unsigned long *mmr32;
+        int err;
         int cpu = raw_smp_processor_id();
 
-        if (validate_memory_access_address((unsigned long)mem, count))
-                return EFAULT;
+        err = validate_memory_access_address((unsigned long)mem, count);
+        if (err)
+                return err;
 
         /*
          * We use the upper half of buf as an intermediate buffer for the
@@ -673,17 +677,17 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
                                 mmr16 = (unsigned short *)tmp_raw;
                                 *(unsigned short *)mem = *mmr16;
                         } else
-                                return EFAULT;
+                                err = -EFAULT;
                         break;
                 case 4:
                         if ((unsigned int)mem % 4 == 0) {
                                 mmr32 = (unsigned long *)tmp_raw;
                                 *(unsigned long *)mem = *mmr32;
                         } else
-                                return EFAULT;
+                                err = -EFAULT;
                         break;
                 default:
-                        return EFAULT;
+                        err = -EFAULT;
                 }
         } else if ((cpu == 0 && IN_MEM(mem, count, L1_CODE_START, L1_CODE_LENGTH))
 #ifdef CONFIG_SMP
@@ -692,10 +696,11 @@ int kgdb_hex2mem(char *buf, char *mem, int count)
                 ) {
                 /* access L1 instruction SRAM */
                 if (dma_memcpy(mem, tmp_raw, count) == NULL)
-                        return EFAULT;
+                        err = -EFAULT;
         } else
-                return probe_kernel_write(mem, tmp_raw, count);
-        return 0;
+                err = probe_kernel_write(mem, tmp_raw, count);
+
+        return err;
 }
 
 int kgdb_validate_break_address(unsigned long addr)
@@ -715,7 +720,7 @@ int kgdb_validate_break_address(unsigned long addr)
         if (IN_MEM(addr, BREAK_INSTR_SIZE, L2_START, L2_LENGTH))
                 return 0;
 
-        return EFAULT;
+        return -EFAULT;
 }
 
 int kgdb_arch_set_breakpoint(unsigned long addr, char *saved_instr)