tree c9887cac68c41adc43eaf78beffccdace4491b59
parent 8f6637b878c9efc70ceee1ed3f480c55f697720a
author Julian Wiedmann <jwi@linux.ibm.com> 1537979351 +0200
committer David S. Miller <davem@davemloft.net> 1537980967 -0700

s390/qeth: remove CARD_FROM_CDEV helper

The cdev-to-card translation walks through two layers of drvdata,
with no locking or refcounting (where eg. the ccwgroup core only
accesses a cdev's drvdata while holding the ccwlock).

This might be safe for now, but any careless usage of the helper has the
potential for subtle races and use-after-free's. Luckily there's only
one occurrence where we _really_ need it (in qeth_irq()), for any other
user we can just pass through an appropriate card pointer.

Signed-off-by: Julian Wiedmann <jwi@linux.ibm.com>
Signed-off-by: David S. Miller <davem@davemloft.net>