qeth: don't query for info if hardware not ready.
authorEugene Crosser <Eugene.Crosser@ru.ibm.com>
Tue, 2 Sep 2014 06:20:17 +0000 (08:20 +0200)
committerDavid S. Miller <davem@davemloft.net>
Tue, 2 Sep 2014 20:54:06 +0000 (13:54 -0700)
commit511c24456ad19d51fcdbc5eda9df7be98c20e6b0
tree89d36bcc3fa41515c01c77b85a92700205b7d98e
parentc24f33796830aa42c496c2b2529ce6d51533af84
qeth: don't query for info if hardware not ready.

When qeth device is queried for ethtool data, hardware operation
is performed to extract the necessary information from the card.
If the card is not online at the moment (e.g. it is undergoing
recovery), this operation produces undesired effects like
temporarily freezing the system. This patch prevents execution
of the hardware query operation when the card is not online.
In such case, ioctl() operation returns error with errno ENODEV.

Reviewed-by: Ursula Braun <ursula.braun@de.ibm.com>
Signed-off-by: Eugene Crosser <Eugene.Crosser@ru.ibm.com>
Signed-off-by: Frank Blaschka <blaschka@linux.vnet.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
drivers/s390/net/qeth_core.h
drivers/s390/net/qeth_core_main.c
drivers/s390/net/qeth_l2_sys.c