linux-kernel - [PATCH] mcb: mcb-pci: detect IO mapped devices before requesting resources

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Message-ID: <20230915111912.258075-1-jorge.sanjuangarcia@duagon.com>
Date:   Fri, 15 Sep 2023 11:19:43 +0000
From:   Sanjuán García, Jorge 
        <Jorge.SanjuanGarcia@...gon.com>
To:     "morbidrsa@...il.com" <morbidrsa@...il.com>
CC:     "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
        "jth@...nel.org" <jth@...nel.org>,
        Rodríguez Barbarin, José Javier 
        <josejavier.rodriguez@...gon.com>,
        Sanjuán García, Jorge 
        <Jorge.SanjuanGarcia@...gon.com>
Subject: [PATCH] mcb: mcb-pci: detect IO mapped devices before requesting
 resources

If the memory region is requested with devm_request_mem_region()
for an IO mapped device it will return an error and mcb-pci will
incorrectly report it with EBUSY code.

Make sure we identify if the reosure is IO mapped and fail early
with a correct ENOTSUPP code.

Reviewed-by: Jose Javier Rodriguez Barbarin <JoseJavier.Rodriguez@...gon.com>
Signed-off-by: Jorge Sanjuan Garcia <jorge.sanjuangarcia@...gon.com>
---
 drivers/mcb/mcb-pci.c | 16 ++++++++--------
 1 file changed, 8 insertions(+), 8 deletions(-)

diff --git a/drivers/mcb/mcb-pci.c b/drivers/mcb/mcb-pci.c
index 53d9202ff9a7..3b634ea318c7 100644
--- a/drivers/mcb/mcb-pci.c
+++ b/drivers/mcb/mcb-pci.c
@@ -45,6 +45,14 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 	}
 	pci_set_master(pdev);
 
+	flags = pci_resource_flags(pdev, 0);
+	if (flags & IORESOURCE_IO) {
+		ret = -ENOTSUPP;
+		dev_err(&pdev->dev,
+			"IO mapped PCI devices are not supported\n");
+		goto out_disable;
+	}
+
 	priv->mapbase = pci_resource_start(pdev, 0);
 	if (!priv->mapbase) {
 		dev_err(&pdev->dev, "No PCI resource\n");
@@ -68,14 +76,6 @@ static int mcb_pci_probe(struct pci_dev *pdev, const struct pci_device_id *id)
 		goto out_disable;
 	}
 
-	flags = pci_resource_flags(pdev, 0);
-	if (flags & IORESOURCE_IO) {
-		ret = -ENOTSUPP;
-		dev_err(&pdev->dev,
-			"IO mapped PCI devices are not supported\n");
-		goto out_disable;
-	}
-
 	pci_set_drvdata(pdev, priv);
 
 	priv->bus = mcb_alloc_bus(&pdev->dev);
-- 
2.34.1