armv7m: improve error handling

Propagate errors unchanged.
Free allocated working area in the error return path.
Remove duplicated cleanup code by rewriting the logic.
As a side-effect, fixes a scan-build warning.

Change-Id: I80e3c0015be672778f916e998c8c2e4f23d7588c
Signed-off-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>
Reviewed-on: http://openocd.zylin.com/117
Tested-by: jenkins
Reviewed-by: Øyvind Harboe <oyvindharboe@gmail.com>

diff --git a/src/target/armv7m.c b/src/target/armv7m.c
index 39a89b9414ed70790bbd9bd3c1817f3807c30e2a..d9e63d7f31bef568f45348150a36f5d847118c1a 100644 (file)
--- a/src/target/armv7m.c
+++ b/src/target/armv7m.c
@@ -626,17 +626,16 @@ int armv7m_checksum_memory(struct target *target,
 
        uint32_t i;
 
-       if (target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm) != ERROR_OK)
-       {
-               return ERROR_TARGET_RESOURCE_NOT_AVAILABLE;
-       }
+       retval = target_alloc_working_area(target, sizeof(cortex_m3_crc_code), &crc_algorithm);
+       if (retval != ERROR_OK)
+               return retval;
 
        /* convert flash writing code into a buffer in target endianness */
-       for (i = 0; i < ARRAY_SIZE(cortex_m3_crc_code); i++)
-               if ((retval = target_write_u16(target, crc_algorithm->address + i*sizeof(uint16_t), cortex_m3_crc_code[i])) != ERROR_OK)
-               {
-                       return retval;
-               }
+       for (i = 0; i < ARRAY_SIZE(cortex_m3_crc_code); i++) {
+               retval = target_write_u16(target, crc_algorithm->address + i*sizeof(uint16_t), cortex_m3_crc_code[i]);
+               if (retval != ERROR_OK)
+                       goto cleanup;
+       }
 
        armv7m_info.common_magic = ARMV7M_COMMON_MAGIC;
        armv7m_info.core_mode = ARMV7M_MODE_ANY;
@@ -649,24 +648,22 @@ int armv7m_checksum_memory(struct target *target,
 
        int timeout = 20000 * (1 + (count / (1024 * 1024)));
 
-       if ((retval = target_run_algorithm(target, 0, NULL, 2, reg_params,
-               crc_algorithm->address, crc_algorithm->address + (sizeof(cortex_m3_crc_code)-6), timeout, &armv7m_info)) != ERROR_OK)
-       {
-               LOG_ERROR("error executing cortex_m3 crc algorithm");
-               destroy_reg_param(&reg_params[0]);
-               destroy_reg_param(&reg_params[1]);
-               target_free_working_area(target, crc_algorithm);
-               return retval;
-       }
+       retval = target_run_algorithm(target, 0, NULL, 2, reg_params, crc_algorithm->address,
+                                     crc_algorithm->address + (sizeof(cortex_m3_crc_code) - 6),
+                                     timeout, &armv7m_info);
 
-       *checksum = buf_get_u32(reg_params[0].value, 0, 32);
+       if (retval == ERROR_OK)
+               *checksum = buf_get_u32(reg_params[0].value, 0, 32);
+       else
+               LOG_ERROR("error executing cortex_m3 crc algorithm");
 
        destroy_reg_param(&reg_params[0]);
        destroy_reg_param(&reg_params[1]);
 
+cleanup:
        target_free_working_area(target, crc_algorithm);
 
-       return ERROR_OK;
+       return retval;
 }
 
 /** Checks whether a memory region is zeroed. */
@@ -711,17 +708,12 @@ int armv7m_blank_check_memory(struct target *target,
        init_reg_param(&reg_params[2], "r2", 32, PARAM_IN_OUT);
        buf_set_u32(reg_params[2].value, 0, 32, 0xff);
 
-       if ((retval = target_run_algorithm(target, 0, NULL, 3, reg_params,
-                       erase_check_algorithm->address, erase_check_algorithm->address + (sizeof(erase_check_code)-2), 10000, &armv7m_info)) != ERROR_OK)
-       {
-               destroy_reg_param(&reg_params[0]);
-               destroy_reg_param(&reg_params[1]);
-               destroy_reg_param(&reg_params[2]);
-               target_free_working_area(target, erase_check_algorithm);
-               return 0;
-       }
+       retval = target_run_algorithm(target, 0, NULL, 3, reg_params, erase_check_algorithm->address,
+                                     erase_check_algorithm->address + (sizeof(erase_check_code) - 2),
+                                     10000, &armv7m_info);
 
-       *blank = buf_get_u32(reg_params[2].value, 0, 32);
+       if (retval == ERROR_OK)
+               *blank = buf_get_u32(reg_params[2].value, 0, 32);
 
        destroy_reg_param(&reg_params[0]);
        destroy_reg_param(&reg_params[1]);
@@ -729,7 +721,7 @@ int armv7m_blank_check_memory(struct target *target,
 
        target_free_working_area(target, erase_check_algorithm);
 
-       return ERROR_OK;
+       return retval;
 }
 
 int armv7m_maybe_skip_bkpt_inst(struct target *target, bool *inst_found)