dmatest: return actual state in 'run' file

The following command should return actual state of the test.
	% cat /sys/kernel/debug/dmatest/run

To wait for test done the user may perform a busy loop that checks the state.
	% while [ $(cat /sys/kernel/debug/dmatest/run) = "Y" ]
	> do
	> 	echo -n "."
	> 	sleep 1
	> done
	> echo

Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Signed-off-by: Vinod Koul <vinod.koul@intel.com>

1 files changed, 21 insertions, 2 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index fc31542e7200..d19234b08342 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -93,6 +93,7 @@ struct dmatest_thread {
         u8                      **srcs;
         u8                      **dsts;
         enum dma_transaction_type type;
+        bool                    done;
 };
 
 struct dmatest_chan {
@@ -603,6 +604,8 @@ err_thread_type:
         if (ret)
                 dmaengine_terminate_all(chan);
 
+        thread->done = true;
+
         if (params->iterations > 0)
                 while (!kthread_should_stop()) {
                         DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wait_dmatest_exit);
@@ -884,12 +887,28 @@ static ssize_t dtf_read_run(struct file *file, char __user *user_buf,
 {
         struct dmatest_info *info = file->private_data;
         char buf[3];
+        struct dmatest_chan *dtc;
+        bool alive = false;
 
         mutex_lock(&info->lock);
-        if (info->nr_channels)
+        list_for_each_entry(dtc, &info->channels, node) {
+                struct dmatest_thread *thread;
+
+                list_for_each_entry(thread, &dtc->threads, node) {
+                        if (!thread->done) {
+                                alive = true;
+                                break;
+                        }
+                }
+        }
+
+        if (alive) {
                 buf[0] = 'Y';
-        else
+        } else {
+                __stop_threaded_test(info);
                 buf[0] = 'N';
+        }
+
         mutex_unlock(&info->lock);
         buf[1] = '\n';
         buf[2] = 0x00;