s390/qeth: remove CARD_FROM_CDEV helper

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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>

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Julian Wiedmann 2018-09-26 18:29:11 +02:00 • committed by David S. Miller

parent 8f6637b878

commit 8d908eb045

1 changed files with 29 additions and 44 deletions

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73

drivers/s390/net/qeth_core_main.c

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