linux-kernel - [PATCH 3/9] firewire: ohci: use devres for MMIO region mapping

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Date:   Sun,  4 Jun 2023 14:44:45 +0900
From:   Takashi Sakamoto <o-takashi@...amocchi.jp>
To:     linux1394-devel@...ts.sourceforge.net, linux-kernel@...r.kernel.org
Subject: [PATCH 3/9] firewire: ohci: use devres for MMIO region mapping

The PCI framework has the convenient helper function to check and map MMIO
region with managed device resource.

This commit elaborates 1394 OHCI driver to use the function.

Signed-off-by: Takashi Sakamoto <o-takashi@...amocchi.jp>
---
 drivers/firewire/ohci.c | 26 ++++++--------------------
 1 file changed, 6 insertions(+), 20 deletions(-)

diff --git a/drivers/firewire/ohci.c b/drivers/firewire/ohci.c
index f3d0882a876c..26c64b60144d 100644
--- a/drivers/firewire/ohci.c
+++ b/drivers/firewire/ohci.c
@@ -3608,18 +3608,12 @@ static int pci_probe(struct pci_dev *dev,
 		return -ENXIO;
 	}
 
-	err = pci_request_region(dev, 0, ohci_driver_name);
+	err = pcim_iomap_regions(dev, 1 << 0, ohci_driver_name);
 	if (err) {
-		ohci_err(ohci, "MMIO resource unavailable\n");
-		return err;
-	}
-
-	ohci->registers = pci_iomap(dev, 0, OHCI1394_REGISTER_SIZE);
-	if (ohci->registers == NULL) {
-		ohci_err(ohci, "failed to remap registers\n");
-		err = -ENXIO;
-		goto fail_iomem;
+		ohci_err(ohci, "request and map MMIO resource unavailable\n");
+		return -ENXIO;
 	}
+	ohci->registers = pcim_iomap_table(dev)[0];
 
 	for (i = 0; i < ARRAY_SIZE(ohci_quirks); i++)
 		if ((ohci_quirks[i].vendor == dev->vendor) &&
@@ -3644,10 +3638,8 @@ static int pci_probe(struct pci_dev *dev,
 					       PAGE_SIZE,
 					       &ohci->misc_buffer_bus,
 					       GFP_KERNEL);
-	if (!ohci->misc_buffer) {
-		err = -ENOMEM;
-		goto fail_iounmap;
-	}
+	if (!ohci->misc_buffer)
+		return -ENOMEM;
 
 	err = ar_context_init(&ohci->ar_request_ctx, ohci, 0,
 			      OHCI1394_AsReqRcvContextControlSet);
@@ -3747,10 +3739,6 @@ static int pci_probe(struct pci_dev *dev,
  fail_misc_buf:
 	dma_free_coherent(ohci->card.device, PAGE_SIZE,
 			  ohci->misc_buffer, ohci->misc_buffer_bus);
- fail_iounmap:
-	pci_iounmap(dev, ohci->registers);
- fail_iomem:
-	pci_release_region(dev, 0);
 
 	return err;
 }
@@ -3793,8 +3781,6 @@ static void pci_remove(struct pci_dev *dev)
 	kfree(ohci->it_context_list);
 	kfree(ohci->ir_context_list);
 	pci_disable_msi(dev);
-	pci_iounmap(dev, ohci->registers);
-	pci_release_region(dev, 0);
 
 	dev_notice(&dev->dev, "removing fw-ohci device\n");
 }
-- 
2.39.2