net: core: decouple ifalias get/set from rtnl lock

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Device alias can be set by either rtnetlink (rtnl is held) or sysfs.

rtnetlink hold the rtnl mutex, sysfs acquires it for this purpose.
Add an extra mutex for it and use rcu to protect concurrent accesses.

This allows the sysfs path to not take rtnl and would later allow
to not hold it when dumping ifalias.

Based on suggestion from Eric Dumazet.

Signed-off-by: Florian Westphal <fw@strlen.de>
Signed-off-by: David S. Miller <davem@davemloft.net>

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This commit is contained in:

Florian Westphal 2017-10-02 23:50:05 +02:00 • committed by David S. Miller

parent 4d2c0cda07

commit 6c5570016b

4 changed files with 65 additions and 25 deletions

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8

include/linux/netdevice.h

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52

net/core/dev.c

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17

net/core/net-sysfs.c

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13

net/core/rtnetlink.c

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