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Sven Eckelmann 10a7796576 batman-adv: Fix double-hold of meshif when getting enabled
It was originally meant to replace the dev_hold with netdev_hold. But this
was missed in batadv_hardif_enable_interface(). As result, there was an
imbalance and a hang when trying to remove the mesh-interface with
(previously) active hard-interfaces:

  unregister_netdevice: waiting for batadv0 to become free. Usage count = 3

Fixes: 00b3553081 ("batman-adv: adopt netdev_hold() / netdev_put()")
Suggested-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot+ff3aa851d46ab82953a3@syzkaller.appspotmail.com
Reported-by: syzbot+4036165fc595a74b09b2@syzkaller.appspotmail.com
Reported-by: syzbot+c35d73ce910d86c0026e@syzkaller.appspotmail.com
Reported-by: syzbot+48c14f61594bdfadb086@syzkaller.appspotmail.com
Reported-by: syzbot+f37372d86207b3bb2941@syzkaller.appspotmail.com
Signed-off-by: Sven Eckelmann <sven@narfation.org>
Reviewed-by: Eric Dumazet <edumazet@google.com>
Link: https://patch.msgid.link/20250414-double_hold_fix-v5-1-10e056324cde@narfation.org
Signed-off-by: Jakub Kicinski <kuba@kernel.org>
History 2025-04-15 17:56:47 -07:00
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Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.