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When (a) "dev" is a bridge port which the DSA switch tree offloads, but is otherwise not a dsa slave (such as a LAG netdev), or (b) "dev" is the bridge net device itself then strange things happen to the dev_hold/dev_put pair: dsa_schedule_work() will still be called with a DSA port that offloads that netdev, but dev_hold() will be called on the non-DSA netdev. Then the "if" condition in dsa_slave_switchdev_event_work() does not pass, because "dev" is not a DSA netdev, so dev_put() is not called. This results in the simple fact that we have a reference counting mismatch on the "dev" net device. This can be seen when we add support for host addresses installed on the bridge net device. ip link add br1 type bridge ip link set br1 address 00:01:02:03:04:05 ip link set swp0 master br1 ip link del br1 [ 968.512278] unregister_netdevice: waiting for br1 to become free. Usage count = 5 It seems foolish to do penny pinching and not add the net_device pointer in the dsa_switchdev_event_work structure, so let's finally do that. As an added bonus, when we start offloading local entries pointing towards the bridge, these will now properly appear as 'offloaded' in 'bridge fdb' (this was not possible before, because 'dev' was assumed to only be a DSA net device): 00:01:02:03:04:05 dev br0 vlan 1 offload master br0 permanent 00:01:02:03:04:05 dev br0 offload master br0 permanent Signed-off-by: Vladimir Oltean <vladimir.oltean@nxp.com> Signed-off-by: David S. Miller <davem@davemloft.net> |
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arch | ||
block | ||
certs | ||
crypto | ||
Documentation | ||
drivers | ||
fs | ||
include | ||
init | ||
ipc | ||
kernel | ||
lib | ||
LICENSES | ||
mm | ||
net | ||
samples | ||
scripts | ||
security | ||
sound | ||
tools | ||
usr | ||
virt | ||
.clang-format | ||
.cocciconfig | ||
.get_maintainer.ignore | ||
.gitattributes | ||
.gitignore | ||
.mailmap | ||
COPYING | ||
CREDITS | ||
Kbuild | ||
Kconfig | ||
MAINTAINERS | ||
Makefile | ||
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 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.