greybus: loopback: Fix broken synchonous test

loopback driver use the send_count variable to know the test progress.
The test may be stopped or change but this variable is never cleaned.
Such situation may break the next run.

Signed-off-by: Alexandre Bailon <abailon@baylibre.com>
Reviewed-by: Bryan O'Donoghue <bryan.odonoghue@linaro.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@google.com>

diff --git a/drivers/staging/greybus/loopback.c b/drivers/staging/greybus/loopback.c
index 9f1cd9d6cd546bb732faf339da5939bde6fde283..6c62706bb94cc40107edbfd0216b9b9fe01210fa 100644 (file)
--- a/drivers/staging/greybus/loopback.c
+++ b/drivers/staging/greybus/loopback.c
@@ -107,6 +107,8 @@ struct gb_loopback {
        u64 elapsed_nsecs;
        u32 apbridge_latency_ts;
        u32 gpbridge_latency_ts;
+
+       u32 send_count;
 };
 
 static struct class loopback_class = {
@@ -247,6 +249,7 @@ static void gb_loopback_check_attr(struct gb_loopback *gb)
        gb->requests_timedout = 0;
        gb->requests_completed = 0;
        gb->iteration_count = 0;
+       gb->send_count = 0;
        gb->error = 0;
 
        if (kfifo_depth < gb->iteration_max) {
@@ -971,7 +974,7 @@ static int gb_loopback_fn(void *data)
        int us_wait = 0;
        int type;
        u32 size;
-       u32 send_count = 0;
+
        struct gb_loopback *gb = data;
 
        while (1) {
@@ -989,10 +992,10 @@ static int gb_loopback_fn(void *data)
                mutex_lock(&gb->mutex);
 
                /* Optionally terminate */
-               if (send_count == gb->iteration_max) {
+               if (gb->send_count == gb->iteration_max) {
                        if (gb->iteration_count == gb->iteration_max) {
                                gb->type = 0;
-                               send_count = 0;
+                               gb->send_count = 0;
                                sysfs_notify(&gb->dev->kobj,  NULL,
                                                "iteration_count");
                        }
@@ -1032,7 +1035,7 @@ static int gb_loopback_fn(void *data)
                        gb->iteration_count++;
                        gb_loopback_calculate_stats(gb, !!error);
                }
-               send_count++;
+               gb->send_count++;
                if (us_wait)
                        udelay(us_wait);
        }