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path: root/drivers/dma/dmatest.c
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Diffstat (limited to 'drivers/dma/dmatest.c')
-rw-r--r--drivers/dma/dmatest.c45
1 files changed, 23 insertions, 22 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index d8ce4ec..e88ded2 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -716,8 +716,7 @@ static int dmatest_func(void *data)
}
dma_async_issue_pending(chan);
- wait_event_freezable_timeout(done_wait,
- done.done || kthread_should_stop(),
+ wait_event_freezable_timeout(done_wait, done.done,
msecs_to_jiffies(params->timeout));
status = dma_async_is_tx_complete(chan, cookie, NULL, NULL);
@@ -997,7 +996,6 @@ static void stop_threaded_test(struct dmatest_info *info)
static int __restart_threaded_test(struct dmatest_info *info, bool run)
{
struct dmatest_params *params = &info->params;
- int ret;
/* Stop any running test first */
__stop_threaded_test(info);
@@ -1012,13 +1010,23 @@ static int __restart_threaded_test(struct dmatest_info *info, bool run)
memcpy(params, &info->dbgfs_params, sizeof(*params));
/* Run test with new parameters */
- ret = __run_threaded_test(info);
- if (ret) {
- __stop_threaded_test(info);
- pr_err("dmatest: Can't run test\n");
+ return __run_threaded_test(info);
+}
+
+static bool __is_threaded_test_run(struct dmatest_info *info)
+{
+ struct dmatest_chan *dtc;
+
+ list_for_each_entry(dtc, &info->channels, node) {
+ struct dmatest_thread *thread;
+
+ list_for_each_entry(thread, &dtc->threads, node) {
+ if (!thread->done)
+ return true;
+ }
}
- return ret;
+ return false;
}
static ssize_t dtf_write_string(void *to, size_t available, loff_t *ppos,
@@ -1091,22 +1099,10 @@ 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);
- 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) {
+ if (__is_threaded_test_run(info)) {
buf[0] = 'Y';
} else {
__stop_threaded_test(info);
@@ -1132,7 +1128,12 @@ static ssize_t dtf_write_run(struct file *file, const char __user *user_buf,
if (strtobool(buf, &bv) == 0) {
mutex_lock(&info->lock);
- ret = __restart_threaded_test(info, bv);
+
+ if (__is_threaded_test_run(info))
+ ret = -EBUSY;
+ else
+ ret = __restart_threaded_test(info, bv);
+
mutex_unlock(&info->lock);
}