linux-kernel - [PATCH 2/2] nvmem: core: append offset to cell name in sysfs

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Date:   Tue, 18 Jul 2023 14:55:57 +0100
From:   Daniel Golle <daniel@...rotopia.org>
To:     Miquel Raynal <miquel.raynal@...tlin.com>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        Srinivas Kandagatla <srinivas.kandagatla@...aro.org>,
        linux-kernel@...r.kernel.org
Subject: [PATCH 2/2] nvmem: core: append offset to cell name in sysfs

The device tree node names are not required to be unique. Append the
offset to the name to make cell nodes with identical names become
accessible via sysfs and avoid kernel stackdump caused by
sysfs: cannot create duplicate filename '...'

Fixes: 757f8b3835c9 ("nvmem: core: Expose cells through sysfs")
Signed-off-by: Daniel Golle <daniel@...rotopia.org>
---
 drivers/nvmem/core.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/drivers/nvmem/core.c b/drivers/nvmem/core.c
index 70e951088826d..90fe9dc30f8ba 100644
--- a/drivers/nvmem/core.c
+++ b/drivers/nvmem/core.c
@@ -480,7 +480,9 @@ static int nvmem_populate_sysfs_cells(struct nvmem_device *nvmem)
 	/* Initialize each attribute to take the name and size of the cell */
 	list_for_each_entry(entry, &nvmem->cells, node) {
 		sysfs_bin_attr_init(&attrs[i]);
-		attrs[i].attr.name = devm_kstrdup(&nvmem->dev, entry->name, GFP_KERNEL);
+		attrs[i].attr.name = devm_kasprintf(&nvmem->dev, GFP_KERNEL,
+						    "%s@%d", entry->name,
+						    entry->offset);
 		attrs[i].attr.mode = 0444;
 		attrs[i].size = entry->bytes;
 		attrs[i].read = &nvmem_cell_attr_read;
-- 
2.41.0