linux-kernel - [PATCH 5/7] memory: renesas-rpc-if: Move resource acquisition to .probe()

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Mon, 27 Jun 2022 17:31:12 +0200
From:   Geert Uytterhoeven <geert+renesas@...der.be>
To:     Vignesh Raghavendra <vigneshr@...com>,
        Sergey Shtylyov <s.shtylyov@....ru>,
        Krzysztof Kozlowski <krzysztof.kozlowski@...aro.org>,
        Wolfram Sang <wsa+renesas@...g-engineering.com>,
        Lad Prabhakar <prabhakar.mahadev-lad.rj@...renesas.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>
Cc:     Mark Brown <broonie@...nel.org>, linux-mtd@...ts.infradead.org,
        linux-renesas-soc@...r.kernel.org, linux-spi@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Geert Uytterhoeven <geert+renesas@...der.be>
Subject: [PATCH 5/7] memory: renesas-rpc-if: Move resource acquisition to .probe()

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

Fix this by moving all resource acquisition to the core driver's probe
routine.

Signed-off-by: Geert Uytterhoeven <geert+renesas@...der.be>
---
 drivers/memory/renesas-rpc-if.c | 47 ++++++++++++++++-----------------
 1 file changed, 23 insertions(+), 24 deletions(-)

diff --git a/drivers/memory/renesas-rpc-if.c b/drivers/memory/renesas-rpc-if.c
index 78e10a7300411191..ef0336cbb4c196fb 100644
--- a/drivers/memory/renesas-rpc-if.c
+++ b/drivers/memory/renesas-rpc-if.c
@@ -276,31 +276,7 @@ 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(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);
 
 	rpcif->dev = dev;
 	rpcif->dirmap = rpc->dirmap;
@@ -707,6 +683,7 @@ static int rpcif_probe(struct platform_device *pdev)
 	struct platform_device *vdev;
 	struct device_node *flash;
 	struct rpcif_priv *rpc;
+	struct resource *res;
 	const char *name;
 	int ret;
 
@@ -731,6 +708,28 @@ 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;
-- 
2.25.1