dmaengine: dmatest: Fix iteration non-stop logic

commit b9f960201249f20deea586b4ec814669b4c6b1c0 upstream.

Under some circumstances, i.e. when test is still running and about to
time out and user runs, for example,

	grep -H . /sys/module/dmatest/parameters/*

the iterations parameter is not respected and test is going on and on until
user gives

	echo 0 > /sys/module/dmatest/parameters/run

This is not what expected.

The history of this bug is interesting. I though that the commit
  2d88ce76eb98 ("dmatest: add a 'wait' parameter")
is a culprit, but looking closer to the code I think it simple revealed the
broken logic from the day one, i.e. in the commit
  0a2ff57d6fba ("dmaengine: dmatest: add a maximum number of test iterations")
which adds iterations parameter.

So, to the point, the conditional of checking the thread to be stopped being
first part of conjunction logic prevents to check iterations. Thus, we have to
always check both conditions to be able to stop after given iterations.

Since it wasn't visible before second commit appeared, I add a respective
Fixes tag.

Fixes: 2d88ce76eb98 ("dmatest: add a 'wait' parameter")
Cc: Dan Williams <dan.j.williams@intel.com>
Cc: Nicolas Ferre <nicolas.ferre@microchip.com>
Signed-off-by: Andy Shevchenko <andriy.shevchenko@linux.intel.com>
Acked-by: Nicolas Ferre <nicolas.ferre@microchip.com>
Link: https://lore.kernel.org/r/20200424161147.16895-1-andriy.shevchenko@linux.intel.com
Signed-off-by: Vinod Koul <vkoul@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 7dd46cf5ed845a764a893eb28a5cd794dcb49948..7a028b57a7efb70bb4e26a5fd5fc58dcf04e7216 100644 (file)
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -505,8 +505,8 @@ static int dmatest_func(void *data)
        flags = DMA_CTRL_ACK | DMA_PREP_INTERRUPT;
 
        ktime = ktime_get();
-       while (!kthread_should_stop()
-              && !(params->iterations && total_tests >= params->iterations)) {
+       while (!(kthread_should_stop() ||
+              (params->iterations && total_tests >= params->iterations))) {
                struct dma_async_tx_descriptor *tx = NULL;
                struct dmaengine_unmap_data *um;
                dma_addr_t srcs[src_cnt];