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authorAndy Shevchenko <andriy.shevchenko@linux.intel.com>2020-04-24 19:11:42 +0300
committerVinod Koul <vkoul@kernel.org>2020-04-27 21:45:35 +0530
commitb9f960201249f20deea586b4ec814669b4c6b1c0 (patch)
treee1f60e51ce9bbf71c8da8f88cb2fd256191da36d /drivers/dma/dmatest.c
parent664475cffb8cd2ee3b9602e60f07c244abb05d4a (diff)
dmaengine: dmatest: Fix iteration non-stop logic
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>
Diffstat (limited to 'drivers/dma/dmatest.c')
-rw-r--r--drivers/dma/dmatest.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index a2cadfa2e6d7..4993e3e5c5b0 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -662,8 +662,8 @@ 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 *dsts;