target: add async algorithm timeout

An issue was observed when using an async algorithm with a target that had
not been previously reset beforehand. The target would enter a infinite
loop within target_run_flash_async_algorithm.

Add a timeout that will at least prevent this issue from happening. and also
suggest the user resets the target.

Change-Id: I5277e0d64e252d3d353e8d5bc9889a37fdc63060
Signed-off-by: Spencer Oliver <spen@spen-soft.co.uk>
Reviewed-on: http://openocd.zylin.com/949
Tested-by: jenkins
Reviewed-by: Andreas Fritiofson <andreas.fritiofson@gmail.com>

diff --git a/src/target/target.c b/src/target/target.c
index b8e4c2ff9ed937dc0720b2f98634a3c6923aa074..6d3a99decd8adc9031124c8506a9411601ad7e86 100644 (file)
--- a/src/target/target.c
+++ b/src/target/target.c
@@ -822,6 +822,7 @@ int target_run_flash_async_algorithm(struct target *target,
                uint32_t entry_point, uint32_t exit_point, void *arch_info)
 {
        int retval;
+       int timeout = 0;
 
        /* Set up working area. First word is write pointer, second word is read pointer,
         * rest is fifo data area. */
@@ -893,9 +894,19 @@ int target_run_flash_async_algorithm(struct target *target,
                         * less than buffer size / flash speed. This is very unlikely to
                         * run when using high latency connections such as USB. */
                        alive_sleep(10);
+
+                       /* to stop an infinite loop on some targets check and increment a timeout
+                        * this issue was observed on a stellaris using the new ICDI interface */
+                       if (timeout++ >= 500) {
+                               LOG_ERROR("timeout waiting for algorithm, a target reset is recommended");
+                               return ERROR_FLASH_OPERATION_FAILED;
+                       }
                        continue;
                }
 
+               /* reset our timeout */
+               timeout = 0;
+
                /* Limit to the amount of data we actually want to write */
                if (thisrun_bytes > count * block_size)
                        thisrun_bytes = count * block_size;