dmaengine/dmatest: Pass timeout via module params

When we try to test all channels present on our controller together, some
channels of lower priority may be very slow as compared to others. If number of
transfers is unlimited, some channels may timeout and will not finish within 3
seconds. Thus, while doing such regress testing we may need to have higher value
of timeouts. This patch adds support for passing timeout value via module
parameters. Default value is 3 msec, a negative value means max timeout
possible.

Signed-off-by: Viresh Kumar <viresh.kumar@st.com>
Signed-off-by: Dan Williams <dan.j.williams@intel.com>

1 files changed, 6 insertions, 1 deletions

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index 7e1b0aa0ca50..e0888cb538d4 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -54,6 +54,11 @@ module_param(pq_sources, uint, S_IRUGO);
 MODULE_PARM_DESC(pq_sources,
                 "Number of p+q source buffers (default: 3)");
 
+static int timeout = 3000;
+module_param(timeout, uint, S_IRUGO);
+MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), \
+                Pass -1 for infinite timeout");
+
 /*
  * Initialization patterns. All bytes in the source buffer has bit 7
  * set, all bytes in the destination buffer has bit 7 cleared.
@@ -299,7 +304,7 @@ static int dmatest_func(void *data)
                 dma_addr_t dma_srcs[src_cnt];
                 dma_addr_t dma_dsts[dst_cnt];
                 struct completion cmp;
-                unsigned long tmo = msecs_to_jiffies(3000);
+                unsigned long tmo = msecs_to_jiffies(timeout);
                 u8 align = 0;
 
                 total_tests++;