[PATCH v5 06/18] fpga: region: get mgr early on

[Alan Tull]

Get the FPGA manager during region creation.

This is a baby step in refactoring the FPGA region code to
separate out common FPGA region code from FPGA region
Device Tree overlay support.

Signed-off-by: Alan Tull <at...@kernel.org>
---
v2: split out from another patch
v3: no change to this patch in this version of patchset
v4: no change to this patch in this version of patchset
v5: no change to this patch in this version of patchset
---
 drivers/fpga/fpga-region.c | 45 +++++++++++++++++++++++----------------------
 1 file changed, 23 insertions(+), 22 deletions(-)

diff --git a/drivers/fpga/fpga-region.c b/drivers/fpga/fpga-region.c
index 352661f..d78f444 100644
--- a/drivers/fpga/fpga-region.c
+++ b/drivers/fpga/fpga-region.c
@@ -31,12 +31,14 @@
  * @dev: FPGA Region device
  * @mutex: enforces exclusive reference to region
  * @bridge_list: list of FPGA bridges specified in region
+ * @mgr: FPGA manager
  * @info: fpga image specific information
  */
 struct fpga_region {
        struct device dev;
        struct mutex mutex; /* for exclusive reference to region */
        struct list_head bridge_list;
+       struct fpga_manager *mgr;
        struct fpga_image_info *info;
 };
 
@@ -123,7 +125,7 @@ static void fpga_region_put(struct fpga_region *region)
 
 /**
  * fpga_region_get_manager - get reference for FPGA manager
- * @region: FPGA region
+ * @np: device node of FPGA region
  *
  * Get FPGA Manager from "fpga-mgr" property or from ancestor region.
  *
@@ -131,10 +133,8 @@ static void fpga_region_put(struct fpga_region *region)
  *
  * Return: fpga manager struct or IS_ERR() condition containing error code.
  */
-static struct fpga_manager *fpga_region_get_manager(struct fpga_region *region)
+static struct fpga_manager *fpga_region_get_manager(struct device_node *np)
 {
-       struct device *dev = &region->dev;
-       struct device_node *np = dev->of_node;
        struct device_node  *mgr_node;
        struct fpga_manager *mgr;
 
@@ -231,7 +231,6 @@ static int fpga_region_program_fpga(struct fpga_region 
*region,
                                    struct device_node *overlay)
 {
        struct device *dev = &region->dev;
-       struct fpga_manager *mgr;
        int ret;
 
        region = fpga_region_get(region);
@@ -240,17 +239,10 @@ static int fpga_region_program_fpga(struct fpga_region 
*region,
                return PTR_ERR(region);
        }
 
-       mgr = fpga_region_get_manager(region);
-       if (IS_ERR(mgr)) {
-               dev_err(dev, "failed to get FPGA manager\n");
-               ret = PTR_ERR(mgr);
-               goto err_put_region;
-       }
-
-       ret = fpga_mgr_lock(mgr);
+       ret = fpga_mgr_lock(region->mgr);
        if (ret) {
                dev_err(dev, "FPGA manager is busy\n");
-               goto err_put_mgr;
+               goto err_put_region;
        }
 
        ret = fpga_region_get_bridges(region, overlay);
@@ -265,7 +257,7 @@ static int fpga_region_program_fpga(struct fpga_region 
*region,
                goto err_put_br;
        }
 
-       ret = fpga_mgr_load(mgr, region->info);
+       ret = fpga_mgr_load(region->mgr, region->info);
        if (ret) {
                dev_err(dev, "failed to load FPGA image\n");
                goto err_put_br;
@@ -277,8 +269,7 @@ static int fpga_region_program_fpga(struct fpga_region 
*region,
                goto err_put_br;
        }
 
-       fpga_mgr_unlock(mgr);
-       fpga_mgr_put(mgr);
+       fpga_mgr_unlock(region->mgr);
        fpga_region_put(region);
 
        return 0;
@@ -286,9 +277,7 @@ static int fpga_region_program_fpga(struct fpga_region 
*region,
 err_put_br:
        fpga_bridges_put(&region->bridge_list);
 err_unlock_mgr:
-       fpga_mgr_unlock(mgr);
-err_put_mgr:
-       fpga_mgr_put(mgr);
+       fpga_mgr_unlock(region->mgr);
 err_put_region:
        fpga_region_put(region);
 
@@ -517,11 +506,20 @@ static int fpga_region_probe(struct platform_device *pdev)
        struct device *dev = &pdev->dev;
        struct device_node *np = dev->of_node;
        struct fpga_region *region;
+       struct fpga_manager *mgr;
        int id, ret = 0;
 
+       mgr = fpga_region_get_manager(np);
+       if (IS_ERR(mgr))
+               return -EPROBE_DEFER;
+
        region = kzalloc(sizeof(*region), GFP_KERNEL);
-       if (!region)
-               return -ENOMEM;
+       if (!region) {
+               ret = -ENOMEM;
+               goto err_put_mgr;
+       }
+
+       region->mgr = mgr;
 
        id = ida_simple_get(&fpga_region_ida, 0, 0, GFP_KERNEL);
        if (id < 0) {
@@ -557,6 +555,8 @@ static int fpga_region_probe(struct platform_device *pdev)
        ida_simple_remove(&fpga_region_ida, id);
 err_kfree:
        kfree(region);
+err_put_mgr:
+       fpga_mgr_put(mgr);
 
        return ret;
 }
@@ -566,6 +566,7 @@ static int fpga_region_remove(struct platform_device *pdev)
        struct fpga_region *region = platform_get_drvdata(pdev);
 
        device_unregister(&region->dev);
+       fpga_mgr_put(region->mgr);
 
        return 0;
 }
-- 
2.7.4