Patch "memory: renesas-rpc-if: Move resource acquisition to .probe()" has been added to the 6.2-stable tree

[Sasha Levin <sashal@xxxxxxxxxx>]

This is a note to let you know that I've just added the patch titled

    memory: renesas-rpc-if: Move resource acquisition to .probe()

to the 6.2-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     memory-renesas-rpc-if-move-resource-acquisition-to-..patch
and it can be found in the queue-6.2 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.



commit 635546c4f23e21251508c25ba4560f0316109a78
Author: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
Date:   Wed Nov 23 15:41:18 2022 +0100

    memory: renesas-rpc-if: Move resource acquisition to .probe()
    
    [ Upstream commit 8b3580df15f53045fda3ffae53f74575c96aa77e ]
    
    While the acquired resources are tied to the lifetime of the RPC-IF core
    device (through the use of managed resource functions), the actual
    resource acquisition is triggered from the HyperBus and SPI child
    drivers.  Due to this mismatch, unbinding and rebinding the child
    drivers manually fails with -EBUSY:
    
        # echo rpc-if-hyperflash > /sys/bus/platform/drivers/rpc-if-hyperflash/unbind
        # echo rpc-if-hyperflash > /sys/bus/platform/drivers/rpc-if-hyperflash/bind
        rpc-if ee200000.spi: can't request region for resource [mem 0xee200000-0xee2001ff]
        rpc-if-hyperflash: probe of rpc-if-hyperflash failed with error -16
    
    The same is true for rpc-if-spi.
    
    Fix this by moving all resource acquisition to the core driver's probe
    routine.
    
    Fixes: ca7d8b980b67 ("memory: add Renesas RPC-IF driver")
    Signed-off-by: Geert Uytterhoeven <geert+renesas@xxxxxxxxx>
    Acked-by: Wolfram Sang <wsa+renesas@xxxxxxxxxxxxxxxxxxxx>
    Link: https://lore.kernel.org/r/c1012ef1de799e08a70817ab7313794e2d8d7bfb.1669213027.git.geert+renesas@xxxxxxxxx
    Signed-off-by: Krzysztof Kozlowski <krzysztof.kozlowski@xxxxxxxxxx>
    Signed-off-by: Sasha Levin <sashal@xxxxxxxxxx>

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index ded80caec1678..5be3b46cd55f1 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -277,32 +277,7 @@ static const struct regmap_config rpcif_regmap_config = {
 
 int rpcif_sw_init(struct rpcif *rpcif, struct device *dev)
 {
-	struct platform_device *pdev = to_platform_device(dev);
 	struct rpcif_priv *rpc = dev_get_drvdata(dev);
-	struct resource *res;
-
-	rpc->base = devm_platform_ioremap_resource_byname(pdev, "regs");
-	if (IS_ERR(rpc->base))
-		return PTR_ERR(rpc->base);
-
-	rpc->regmap = devm_regmap_init(&pdev->dev, NULL, rpc, &rpcif_regmap_config);
-	if (IS_ERR(rpc->regmap)) {
-		dev_err(&pdev->dev,
-			"failed to init regmap for rpcif, error %ld\n",
-			PTR_ERR(rpc->regmap));
-		return	PTR_ERR(rpc->regmap);
-	}
-
-	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
-	rpc->dirmap = devm_ioremap_resource(&pdev->dev, res);
-	if (IS_ERR(rpc->dirmap))
-		return PTR_ERR(rpc->dirmap);
-	rpc->size = resource_size(res);
-
-	rpc->type = (uintptr_t)of_device_get_match_data(dev);
-	rpc->rstc = devm_reset_control_get_exclusive(&pdev->dev, NULL);
-	if (IS_ERR(rpc->rstc))
-		return PTR_ERR(rpc->rstc);
 
 	rpcif->dev = dev;
 	rpcif->dirmap = rpc->dirmap;
@@ -705,9 +680,11 @@ EXPORT_SYMBOL(rpcif_dirmap_read);
 
 static int rpcif_probe(struct platform_device *pdev)
 {
+	struct device *dev = &pdev->dev;
 	struct platform_device *vdev;
 	struct device_node *flash;
 	struct rpcif_priv *rpc;
+	struct resource *res;
 	const char *name;
 	int ret;
 
@@ -732,6 +709,28 @@ static int rpcif_probe(struct platform_device *pdev)
 	if (!rpc)
 		return -ENOMEM;
 
+	rpc->base = devm_platform_ioremap_resource_byname(pdev, "regs");
+	if (IS_ERR(rpc->base))
+		return PTR_ERR(rpc->base);
+
+	rpc->regmap = devm_regmap_init(dev, NULL, rpc, &rpcif_regmap_config);
+	if (IS_ERR(rpc->regmap)) {
+		dev_err(dev, "failed to init regmap for rpcif, error %ld\n",
+			PTR_ERR(rpc->regmap));
+		return	PTR_ERR(rpc->regmap);
+	}
+
+	res = platform_get_resource_byname(pdev, IORESOURCE_MEM, "dirmap");
+	rpc->dirmap = devm_ioremap_resource(dev, res);
+	if (IS_ERR(rpc->dirmap))
+		return PTR_ERR(rpc->dirmap);
+	rpc->size = resource_size(res);
+
+	rpc->type = (uintptr_t)of_device_get_match_data(dev);
+	rpc->rstc = devm_reset_control_get_exclusive(dev, NULL);
+	if (IS_ERR(rpc->rstc))
+		return PTR_ERR(rpc->rstc);
+
 	vdev = platform_device_alloc(name, pdev->id);
 	if (!vdev)
 		return -ENOMEM;