linux-kernel - [PATCH v2 pci-next] PCI: Keep both device name and resource name for config space remaps

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Date:   Thu, 19 Nov 2020 21:26:33 +0000
From:   Alexander Lobakin <alobakin@...me>
To:     Bjorn Helgaas <bhelgaas@...gle.com>
Cc:     linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
        Alexander Lobakin <alobakin@...me>
Subject: [PATCH v2 pci-next] PCI: Keep both device name and resource name for config space remaps

Follow the rule taken in commit 35bd8c07db2c
("devres: keep both device name and resource name in pretty name")
and keep both device and resource names while requesting memory
regions for PCI config space to prettify e.g. /proc/iomem output:

Before (DWC Host Controller):

18b00000-18b01fff : dbi
18b10000-18b11fff : config
18b20000-18b21fff : dbi
18b30000-18b31fff : config

After:

18b00000-18b01fff : 18b00000.pci dbi
18b10000-18b11fff : 18b00000.pci config
18b20000-18b21fff : 18b20000.pci dbi
18b30000-18b31fff : 18b20000.pci config

Since v1 [0]:
 - massage subject and commit message (Bjorn);
 - no functional changes.

[0] https://lore.kernel.org/lkml/JvyOzv8K8n5CCdP1xfLOdOWh4AbFrXdMMOEExr6em8@cp4-web-036.plabs.ch

Cc: Bjorn Helgaas <bhelgaas@...gle.com>
Signed-off-by: Alexander Lobakin <alobakin@...me>
---
 drivers/pci/pci.c | 9 ++++++++-
 1 file changed, 8 insertions(+), 1 deletion(-)

diff --git a/drivers/pci/pci.c b/drivers/pci/pci.c
index e578d34095e9..0716691f7d14 100644
--- a/drivers/pci/pci.c
+++ b/drivers/pci/pci.c
@@ -4188,7 +4188,14 @@ void __iomem *devm_pci_remap_cfg_resource(struct device *dev,
 	}
 
 	size = resource_size(res);
-	name = res->name ?: dev_name(dev);
+
+	if (res->name)
+		name = devm_kasprintf(dev, GFP_KERNEL, "%s %s", dev_name(dev),
+				      res->name);
+	else
+		name = devm_kstrdup(dev, dev_name(dev), GFP_KERNEL);
+	if (!name)
+		return IOMEM_ERR_PTR(-ENOMEM);
 
 	if (!devm_request_mem_region(dev, res->start, size, name)) {
 		dev_err(dev, "can't request region for resource %pR\n", res);
-- 
2.29.2