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Mohammad Heib 8553bf2e09 i40e: drop udp_tunnel_get_rx_info() call from i40e_open() 
[ Upstream commit 4085719495 ]

The i40e driver calls udp_tunnel_get_rx_info() during i40e_open().
This is redundant because UDP tunnel RX offload state is preserved
across device down/up cycles. The udp_tunnel core handles
synchronization automatically when required.

Furthermore, recent changes in the udp_tunnel infrastructure require
querying RX info while holding the udp_tunnel lock. Calling it
directly from the ndo_open path violates this requirement,
triggering the following lockdep warning:

  Call Trace:
   <TASK>
   ? __udp_tunnel_nic_assert_locked+0x39/0x40 [udp_tunnel]
   i40e_open+0x135/0x14f [i40e]
   __dev_open+0x121/0x2e0
   __dev_change_flags+0x227/0x270
   dev_change_flags+0x3d/0xb0
   devinet_ioctl+0x56f/0x860
   sock_do_ioctl+0x7b/0x130
   __x64_sys_ioctl+0x91/0xd0
   do_syscall_64+0x90/0x170
   ...
   </TASK>

Remove the redundant and unsafe call to udp_tunnel_get_rx_info() from
i40e_open() resolve the locking violation.

Fixes: 1ead750109 ("udp_tunnel: remove rtnl_lock dependency")
Signed-off-by: Mohammad Heib <mheib@redhat.com>
Reviewed-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com>
Reviewed-by: Paul Menzel <pmenzel@molgen.mpg.de>
Tested-by: Rinitha S <sx.rinitha@intel.com> (A Contingent worker at Intel)
Signed-off-by: Tony Nguyen <anthony.l.nguyen@intel.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2026-02-11 13:41:56 +01:00
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README

README 

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.