linux-kernel - [PATCH v2 2/2] misc: sram: Generate unique names for subpools

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Message-Id: <20230417-ux500-sram-v2-2-6e62ad551faa@linaro.org>
Date:   Thu, 20 Apr 2023 23:17:35 +0200
From:   Linus Walleij <linus.walleij@...aro.org>
To:     Rob Herring <robh+dt@...nel.org>,
        Krzysztof Kozlowski <krzysztof.kozlowski+dt@...aro.org>,
        Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Cc:     Rob Herring <robh@...nel.org>, devicetree@...r.kernel.org,
        linux-kernel@...r.kernel.org,
        Linus Walleij <linus.walleij@...aro.org>
Subject: [PATCH v2 2/2] misc: sram: Generate unique names for subpools

The current code will, if we do not specify unique labels
for the SRAM subnodes, fail to register several nodes named
the same.

Example:

sram@...20000 {
  (...)
  sram@0 {
    (...)
  };
  sram@...0 {
    (...)
  };
};

Since the child->name in both cases will be "sram" the
gen_pool_create() will fail because the name is not unique.

Use dev_name() for the device as this will have bus ID
set to the fully translated address for the node, and that
will always be unique.

Signed-off-by: Linus Walleij <linus.walleij@...aro.org>
---
ChangeLog v1->v2:
- Stop complicating things and just use dev_name()
---
 drivers/misc/sram.c | 9 +++++----
 1 file changed, 5 insertions(+), 4 deletions(-)

diff --git a/drivers/misc/sram.c b/drivers/misc/sram.c
index f0e7f02605eb..f80c3adddf0b 100644
--- a/drivers/misc/sram.c
+++ b/drivers/misc/sram.c
@@ -240,10 +240,11 @@ static int sram_reserve_regions(struct sram_dev *sram, struct resource *res)
 				goto err_chunks;
 			}
 			if (!label)
-				label = child->name;
-
-			block->label = devm_kstrdup(sram->dev,
-						    label, GFP_KERNEL);
+				block->label = devm_kasprintf(sram->dev, GFP_KERNEL,
+							      "%s", dev_name(sram->dev));
+			else
+				block->label = devm_kstrdup(sram->dev,
+							    label, GFP_KERNEL);
 			if (!block->label) {
 				ret = -ENOMEM;
 				goto err_chunks;

-- 
2.40.0