linux-kernel - [PATCH 2/2] block: allow empty cmdline partition set

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Message-Id: <b84381943483d1e0b44ca28b4e549f2f912349bf.1634856658.git.mirq-linux@rere.qmqm.pl>
Date:   Fri, 22 Oct 2021 00:51:24 +0200
From:   Michał Mirosław <mirq-linux@...e.qmqm.pl>
To:     Jonathan Corbet <corbet@....net>, Jens Axboe <axboe@...nel.dk>
Cc:     linux-doc@...r.kernel.org, linux-kernel@...r.kernel.org,
        linux-block@...r.kernel.org
Subject: [PATCH 2/2] block: allow empty cmdline partition set

Make no-partitions setting valid. This makes it possible to prevent
kernel from trying to read a partition table from a device.

Signed-off-by: Michał Mirosław <mirq-linux@...e.qmqm.pl>
---
 Documentation/block/cmdline-partition.rst | 2 +-
 block/partitions/cmdline.c                | 8 +++-----
 2 files changed, 4 insertions(+), 6 deletions(-)

diff --git a/Documentation/block/cmdline-partition.rst b/Documentation/block/cmdline-partition.rst
index 530bedff548a..a5ccacee982f 100644
--- a/Documentation/block/cmdline-partition.rst
+++ b/Documentation/block/cmdline-partition.rst
@@ -13,7 +13,7 @@ Users can easily change the partition.
 The format for the command line is just like mtdparts:
 
 blkdevparts=<blkdev-def>[;<blkdev-def>]
-  <blkdev-def> := <blkdev-id>:<partdef>[,<partdef>]
+  <blkdev-def> := <blkdev-id>:[<partdef>[,<partdef>]]
     <partdef> := <size>[@<offset>](part-name)
 
 <blkdev-id>
diff --git a/block/partitions/cmdline.c b/block/partitions/cmdline.c
index 1af610f0ba8c..3655e8c8e949 100644
--- a/block/partitions/cmdline.c
+++ b/block/partitions/cmdline.c
@@ -164,11 +164,9 @@ static int parse_parts(struct cmdline_parts **parts, const char *bdevdef)
 		next_subpart = &(*next_subpart)->next_subpart;
 	}
 
-	if (!newparts->subpart) {
-		pr_warn("cmdline partition has no valid partition.");
-		ret = -EINVAL;
-		goto fail;
-	}
+	if (!newparts->subpart)
+		pr_warn("%s: cmdline partition has no valid partitions.",
+			newparts->name);
 
 	*parts = newparts;
 
-- 
2.30.2