linux-kernel - [PATCH v2] dmaengine: dmatest: timeout value of -1 should specify infinite wait

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Message-ID: <156089501718.8121.12070116684408969349.stgit@taos>
Date:   Tue, 18 Jun 2019 22:03:04 +0000
From:   "Hook, Gary" <Gary.Hook@....com>
To:     "dmaengine@...r.kernel.org" <dmaengine@...r.kernel.org>,
        "vkoul@...nel.org" <vkoul@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: [PATCH v2] dmaengine: dmatest: timeout value of -1 should specify
 infinite wait

The dmatest module parameter 'timeout' is documented as accepting a
-1 to mean "infinite timeout". Howver, an infinite timeout is not
advised, nor possible since the module parameter is an unsigned int,
which won't accept a negative value. Change the parameter
comment to reflect current behavior, which allows values from 0 up to
4294967295 (0xFFFFFFFF).

Signed-off-by: Gary R Hook <gary.hook@....com>
---
 drivers/dma/dmatest.c |    6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/dma/dmatest.c b/drivers/dma/dmatest.c
index b96814a7dceb..e0c229aa1353 100644
--- a/drivers/dma/dmatest.c
+++ b/drivers/dma/dmatest.c
@@ -65,7 +65,7 @@ MODULE_PARM_DESC(pq_sources,
 static int timeout = 3000;
 module_param(timeout, uint, S_IRUGO | S_IWUSR);
 MODULE_PARM_DESC(timeout, "Transfer Timeout in msec (default: 3000), "
-		 "Pass -1 for infinite timeout");
+		 "Pass 0xFFFFFFFF (4294967295) for maximum timeout");
 
 static bool noverify;
 module_param(noverify, bool, S_IRUGO | S_IWUSR);
@@ -97,7 +97,7 @@ MODULE_PARM_DESC(transfer_size, "Optional custom transfer size in bytes (default
  * @iterations:		iterations before stopping test
  * @xor_sources:	number of xor source buffers
  * @pq_sources:		number of p+q source buffers
- * @timeout:		transfer timeout in msec, -1 for infinite timeout
+ * @timeout:		transfer timeout in msec, 0 - 0xFFFFFFFF (4294967295)
  */
 struct dmatest_params {
 	unsigned int	buf_size;
@@ -108,7 +108,7 @@ struct dmatest_params {
 	unsigned int	iterations;
 	unsigned int	xor_sources;
 	unsigned int	pq_sources;
-	int		timeout;
+	unsigned int	timeout;
 	bool		noverify;
 	bool		norandom;
 	int		alignment;