[PATCH 5.15.y 4/6] PCI: Add kerneldoc for pci_resize_resource()

[Sasha Levin <sashal@kernel.org>]

From: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>

[ Upstream commit d787018e2dfdc4c1331538e7a8717690d1b7c9b3 ]

As pci_resize_resource() is meant to be used also outside of PCI core,
document the interface with kerneldoc.

Signed-off-by: Ilpo Järvinen <ilpo.jarvinen@linux.intel.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
Tested-by: Alex Bennée <alex.bennee@linaro.org> # AVA, AMD GPU
Link: https://patch.msgid.link/20251113162628.5946-8-ilpo.jarvinen@linux.intel.com
Stable-dep-of: ee7471fe968d ("PCI: Skip Resizable BAR restore on read error")
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
 drivers/pci/setup-res.c | 20 ++++++++++++++++++++
 1 file changed, 20 insertions(+)

diff --git a/drivers/pci/setup-res.c b/drivers/pci/setup-res.c
index 9561365c95b37f..aa66e85a3a4715 100644
--- a/drivers/pci/setup-res.c
+++ b/drivers/pci/setup-res.c
@@ -422,6 +422,26 @@ void pci_release_resource(struct pci_dev *dev, int resno)
 }
 EXPORT_SYMBOL(pci_release_resource);
 
+/**
+ * pci_resize_resource - reconfigure a Resizable BAR and resources
+ * @dev: the PCI device
+ * @resno: index of the BAR to be resized
+ * @size: new size as defined in the spec (0=1MB, 31=128TB)
+ * @exclude_bars: a mask of BARs that should not be released
+ *
+ * Reconfigure @resno to @size and re-run resource assignment algorithm
+ * with the new size.
+ *
+ * Prior to resize, release @dev resources that share a bridge window with
+ * @resno.  This unpins the bridge window resource to allow changing it.
+ *
+ * The caller may prevent releasing a particular BAR by providing
+ * @exclude_bars mask, but this may result in the resize operation failing
+ * due to insufficient space.
+ *
+ * Return: 0 on success, or negative on error. In case of an error, the
+ *         resources are restored to their original places.
+ */
 int pci_resize_resource(struct pci_dev *dev, int resno, int size,
 			int exclude_bars)
 {
-- 
2.53.0