From a5a14281160881fbb39d80a2572a18ecadbeedd5 Mon Sep 17 00:00:00 2001

From: Yu Watanabe <watanabe.yu+github@gmail.com>

Date: Sun, 12 Sep 2021 16:05:51 +0900

Subject: [PATCH] udev-node: simplify the example of race

(cherry picked from commit 3df566a66723490914ef3bae0ca8046044b70dce)

Related: #1977994

---

 src/udev/udev-node.c | 10 +++++-----

 1 file changed, 5 insertions(+), 5 deletions(-)

diff --git a/src/udev/udev-node.c b/src/udev/udev-node.c

index bb551d86b0..61cb9a449b 100644

--- a/src/udev/udev-node.c

+++ b/src/udev/udev-node.c

@@ -272,14 +272,14 @@ static int update_timestamp(sd_device *dev, const char *path, struct stat *prev)

         /* Even if a symlink in the stack directory is created/removed, the mtime of the directory may

          * not be changed. Why? Let's consider the following situation. For simplicity, let's assume

-         * there exist three udev workers (A, B, and C) and all of them calls link_update() for the

-         * same devlink simultaneously.

+         * there exist two udev workers (A and B) and all of them calls link_update() for the same

+         * devlink simultaneously.

          *

-         * 1. B creates/removes a symlink in the stack directory.

+         * 1. A creates/removes a symlink in the stack directory.

          * 2. A calls the first stat() in the loop of link_update().

          * 3. A calls link_find_prioritized().

-         * 4. C creates/removes another symlink in the stack directory, so the result of the step 3 is outdated.

-         * 5. B and C finish link_update().

+         * 4. B creates/removes another symlink in the stack directory, so the result of the step 3 is outdated.

+         * 5. B finishes link_update().

          * 6. A creates/removes devlink according to the outdated result in the step 3.

          * 7. A calls the second stat() in the loop of link_update().

          *