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Jacob Keller ba4e003d29 i40e: don't hold spinlock while resetting VF 
When we refactored handling of the PVID in commit 9af52f60b2
("i40e: use (add|rm)_vlan_all_mac helper functions when changing PVID")
we introduced a scheduling while atomic regression.

This occurred because we now held the spinlock across a call to
i40e_reset_vf(), which results in a usleep_range() call that triggers
a scheduling while atomic bug. This was rare as it only occurred if the
user configured a VLAN on a VF and also attempted to reconfigure the VF
from the host system with a port VLAN.

We do need to hold the lock while calling i40e_is_vsi_in_vlan(), but we
should not be holding it while we reset the VF.

We'll fix this by introducing a separate helper function
i40e_vsi_has_vlans which checks whether we have a PVID and whether the
VSI has configured VLANs. This helper function will manage its own need
for the mac_filter_hash_lock.

Then, we can move the acquiring of the spinlock until after we reset the
VF, which ensures that we do not sleep while holding the lock.

Using a separate function like this makes the code more clear and is
easier to read than attempting to release and re-acquire the spinlock
when we reset the VF.

Signed-off-by: Jacob Keller <jacob.e.keller@intel.com>
Tested-by: Andrew Bowers <andrewx.bowers@intel.com>
Signed-off-by: Jeff Kirsher <jeffrey.t.kirsher@intel.com>
2017-10-02 12:46:35 -07:00
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drivers i40e: don't hold spinlock while resetting VF 2017-10-02 12:46:35 -07:00
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include net/dst: Make skb parameter of skb{metadata_dst, tunnel_info}() const 2017-10-02 11:06:07 -07:00
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kernel bpf: Fix compiler warning on info.map_ids for 32bit platform 2017-10-01 04:09:42 +01:00
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net flow_dissector: dissect tunnel info 2017-10-02 11:06:07 -07:00
samples samples/bpf: fix warnings in xdp_monitor_user 2017-10-01 23:08:24 -07:00
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tools selftests: rtnetlink.sh: add vxlan and fou test cases 2017-10-02 11:15:31 -07:00
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README 

Linux kernel
============

This file was moved to Documentation/admin-guide/README.rst

Please notice that there are several guides for kernel developers and users.
These guides can be rendered in a number of formats, like HTML and PDF.

In order to build the documentation, use ``make htmldocs`` or
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There are various text files in the Documentation/ subdirectory,
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See Documentation/00-INDEX for a list of what is contained in each file.

Please read the Documentation/process/changes.rst file, as it contains the
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the problems which may result by upgrading your kernel.