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In some occasions task held spinlock (mac_filter_hash_lock), while being rescheduled due to admin queue mutex_lock. The struct i40e_spinlock asq_spinlock, which later expands to struct mutex spinlock. Moved i40e_aq_set_vsi_multicast_promiscuous(), i40e_aq_set_vsi_unicast_promiscuous(), i40e_aq_set_vsi_mc_promisc_on_vlan(), and i40e_aq_set_vsi_uc_promisc_on_vlan() outside of atomic context. Without this patch there is a race condition, which might result in scheduling while in atomic context. The race condition is between the thread, which holds mac_filter_hash_lock, while trying to acquire an admin queue mutex and a thread, which already has said admin queue mutex. The thread, which holds spinlock, fails to acquire the mutex, which causes this thread to sleep. Signed-off-by: Arkadiusz Kubalewski <arkadiusz.kubalewski@intel.com> Signed-off-by: Aleksandr Loktionov <aleksandr.loktionov@intel.com> Tested-by: Andrew Bowers <andrewx.bowers@intel.com> Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
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 Restructured Text 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.