linux-kernel - [PATCH v4 1/4] fpga: region: don't use drvdata in common fpga code

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Date:   Thu, 12 Apr 2018 15:30:40 -0500
From:   Alan Tull <atull@...nel.org>
To:     Moritz Fischer <mdf@...nel.org>
Cc:     Alan Tull <atull@...nel.org>, linux-kernel@...r.kernel.org,
        linux-fpga@...r.kernel.org
Subject: [PATCH v4 1/4] fpga: region: don't use drvdata in common fpga code

Changes to fpga_region_register function to not set drvdata.

Setting drvdata is fine for DT based devices that will have one region
per platform device.  However PCIe based devices may have multiple
FPGA regions under one PCIe device.  Without these changes, the PCIe
solution has to create an extra device for each child region to hold
drvdata.

Signed-off-by: Alan Tull <atull@...nel.org>
Reported-by: Jiuyue Ma <majiuyue@...wei.com>
Acked-by: Moritz Fischer <mdf@...nel.org>
---
v2: No change to this patch in v2 of patchset
v3: Add Moritz' ack
v4: Reword header
---
 drivers/fpga/fpga-region.c    | 1 -
 drivers/fpga/of-fpga-region.c | 1 +
 2 files changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index edab2a2..ebe1f87 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -178,7 +178,6 @@ int fpga_region_register(struct device *dev, struct fpga_region *region)
 	region->dev.parent = dev;
 	region->dev.of_node = dev->of_node;
 	region->dev.id = id;
-	dev_set_drvdata(dev, region);
 
 	ret = dev_set_name(&region->dev, "region%d", id);
 	if (ret)
diff --git a/drivers/fpga/of-fpga-region.c b/drivers/fpga/of-fpga-region.c
index 119ff75..35e7e8c 100644
--- a/drivers/fpga/of-fpga-region.c
+++ b/drivers/fpga/of-fpga-region.c
@@ -438,6 +438,7 @@ static int of_fpga_region_probe(struct platform_device *pdev)
 		goto eprobe_mgr_put;
 
 	of_platform_populate(np, fpga_region_of_match, NULL, &region->dev);
+	dev_set_drvdata(dev, region);
 
 	dev_info(dev, "FPGA Region probed\n");
 
-- 
2.7.4