linux-kernel - [PATCH v3 1/9] PCI: Make pcim_iounmap

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Message-ID: <20240822134744.44919-2-pstanner@redhat.com>
Date: Thu, 22 Aug 2024 15:47:33 +0200
From: Philipp Stanner <pstanner@...hat.com>
To: Jonathan Corbet <corbet@....net>,
	Jens Axboe <axboe@...nel.dk>,
	Wu Hao <hao.wu@...el.com>,
	Tom Rix <trix@...hat.com>,
	Moritz Fischer <mdf@...nel.org>,
	Xu Yilun <yilun.xu@...el.com>,
	Andy Shevchenko <andy@...nel.org>,
	Linus Walleij <linus.walleij@...aro.org>,
	Bartosz Golaszewski <brgl@...ev.pl>,
	"David S. Miller" <davem@...emloft.net>,
	Eric Dumazet <edumazet@...gle.com>,
	Jakub Kicinski <kuba@...nel.org>,
	Paolo Abeni <pabeni@...hat.com>,
	Alexandre Torgue <alexandre.torgue@...s.st.com>,
	Jose Abreu <joabreu@...opsys.com>,
	Maxime Coquelin <mcoquelin.stm32@...il.com>,
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	Alvaro Karsz <alvaro.karsz@...id-run.com>,
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	Mark Brown <broonie@...nel.org>,
	David Lechner <dlechner@...libre.com>,
	Uwe Kleine-König <u.kleine-koenig@...gutronix.de>,
	Philipp Stanner <pstanner@...hat.com>,
	Damien Le Moal <dlemoal@...nel.org>,
	Hannes Reinecke <hare@...e.de>,
	Chaitanya Kulkarni <kch@...dia.com>
Cc: linux-doc@...r.kernel.org,
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	linux-block@...r.kernel.org,
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	linux-pci@...r.kernel.org,
	virtualization@...ts.linux.dev
Subject: [PATCH v3 1/9] PCI: Make pcim_iounmap_region() a public function

The function pcim_iounmap_regions() is problematic because it uses a
bitmask mechanism to release / iounmap multiple BARs at once. It, thus,
prevents getting rid of the problematic iomap table mechanism which was
deprecated in commit e354bb84a4c1 ("PCI: Deprecate pcim_iomap_table(),
pcim_iomap_regions_request_all()").

Make pcim_iounmap_region() public as the successor of
pcim_iounmap_regions().

Signed-off-by: Philipp Stanner <pstanner@...hat.com>
Reviewed-by: Damien Le Moal <dlemoal@...nel.org>
---
 drivers/pci/devres.c | 3 ++-
 include/linux/pci.h  | 1 +
 2 files changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/devres.c b/drivers/pci/devres.c
index b97589e99fad..4dbba385e6b4 100644
--- a/drivers/pci/devres.c
+++ b/drivers/pci/devres.c
@@ -771,7 +771,7 @@ EXPORT_SYMBOL(pcim_iomap_region);
  * Unmap a BAR and release its region manually. Only pass BARs that were
  * previously mapped by pcim_iomap_region().
  */
-static void pcim_iounmap_region(struct pci_dev *pdev, int bar)
+void pcim_iounmap_region(struct pci_dev *pdev, int bar)
 {
 	struct pcim_addr_devres res_searched;
 
@@ -782,6 +782,7 @@ static void pcim_iounmap_region(struct pci_dev *pdev, int bar)
 	devres_release(&pdev->dev, pcim_addr_resource_release,
 			pcim_addr_resources_match, &res_searched);
 }
+EXPORT_SYMBOL(pcim_iounmap_region);
 
 /**
  * pcim_iomap_regions - Request and iomap PCI BARs (DEPRECATED)
diff --git a/include/linux/pci.h b/include/linux/pci.h
index 01b9f1a351be..9625d8a7b655 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -2297,6 +2297,7 @@ void __iomem * const *pcim_iomap_table(struct pci_dev *pdev);
 int pcim_request_region(struct pci_dev *pdev, int bar, const char *name);
 void __iomem *pcim_iomap_region(struct pci_dev *pdev, int bar,
 				       const char *name);
+void pcim_iounmap_region(struct pci_dev *pdev, int bar);
 int pcim_iomap_regions(struct pci_dev *pdev, int mask, const char *name);
 int pcim_iomap_regions_request_all(struct pci_dev *pdev, int mask,
 				   const char *name);
-- 
2.46.0