linux-kernel - [PATCH 2/2] ntb: make DMA_OUT_RESOURCE

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Message-Id: <1471884696-25558-2-git-send-email-hofrat@osadl.org>
Date:   Mon, 22 Aug 2016 18:51:36 +0200
From:   Nicholas Mc Guire <hofrat@...dl.org>
To:     Jon Mason <jdmason@...zu.us>
Cc:     Dave Jiang <dave.jiang@...el.com>,
        Allen Hubbe <Allen.Hubbe@....com>,
        Logan Gunthorpe <logang@...tatee.com>,
        Arnd Bergmann <arnd@...db.de>,
        Sudip Mukherjee <sudipm.mukherjee@...il.com>,
        linux-ntb@...glegroups.com, linux-kernel@...r.kernel.org,
        Nicholas Mc Guire <hofrat@...dl.org>
Subject: [PATCH 2/2] ntb: make DMA_OUT_RESOURCE_TO HZ independent

schedule_timeout_* takes a timeout in jiffies but the code currently is
passing in a constant which makes this timeout HZ dependent, so pass it
through msecs_to_jiffies() to fix this up.

Signed-off-by: Nicholas Mc Guire <hofrat@...dl.org>
---

Problem found by coccinelle script

The below patch sets the timeout to 50ms - not clear what HZ setting was
assumed during design/testing, so this needs an ack by someone who knows
the driver and can confirm that 50ms is reasonable to wait on DMA retries.

Patch was compile tested with: x86_64_defconfig + CONFIG_NTB=m,
CONFIG_NTB_PERF=m

Patch is against 4.8.0-rc2 (localversion-next is -next-20160822)

 drivers/ntb/test/ntb_perf.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/ntb/test/ntb_perf.c b/drivers/ntb/test/ntb_perf.c
index 6a50f20..e065b69 100644
--- a/drivers/ntb/test/ntb_perf.c
+++ b/drivers/ntb/test/ntb_perf.c
@@ -72,7 +72,7 @@
 #define MAX_THREADS		32
 #define MAX_TEST_SIZE		SZ_1M
 #define MAX_SRCS		32
-#define DMA_OUT_RESOURCE_TO	50
+#define DMA_OUT_RESOURCE_TO	msecs_to_jiffies(50)
 #define DMA_RETRIES		20
 #define SZ_4G			(1ULL << 32)
 #define MAX_SEG_ORDER		20 /* no larger than 1M for kmalloc buffer */
-- 
2.1.4