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| author | Javier Martinez Canillas <javier@dowhile0.org> | 2012-01-03 13:36:19 +0000 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-01-03 20:24:15 -0500 |
| commit | 6386994e03ebbe60338ded3d586308a41e81c0dc (patch) | |
| tree | 2fe7a1f71b5ae587b3203180a865bacb25089e51 /net/socket.c | |
| parent | 43c6759e73907e4c8e6624f70f5c4a860518b203 (diff) | |
| download | lwn-6386994e03ebbe60338ded3d586308a41e81c0dc.tar.gz lwn-6386994e03ebbe60338ded3d586308a41e81c0dc.zip | |
net/smsc911x: Check if PHY is in operational mode before software reset
SMSC LAN generation 4 chips integrate an IEEE 802.3 ethernet physical layer.
The PHY driver for this integrated chip enable an energy detect power-down mode.
When the PHY is in a power-down mode, it prevents the MAC portion chip to be
software reseted.
That means that if we compile the kernel with the configuration option SMSC_PHY
enabled and try to bring the network interface up without an cable plug-ed the
PHY will be in a low power mode and the software reset will fail returning -EIO
to user-space:
root@igep00x0:~# ifconfig eth0 up
ifconfig: SIOCSIFFLAGS: Input/output error
This patch disable the energy detect power-down mode before trying to software
reset the LAN chip and re-enables after it was reseted successfully.
Signed-off-by: Javier Martinez Canillas <javier@dowhile0.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'net/socket.c')
0 files changed, 0 insertions, 0 deletions