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| author | Stefan Weinhuber <wein@de.ibm.com> | 2011-04-20 10:15:30 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2011-04-20 10:15:43 +0200 |
| commit | 65f8da475995f667af5298c644707dbd9d646ca6 (patch) | |
| tree | bca8597443060e79f09a8843903bbc55b2dece52 /drivers/power | |
| parent | Merge branch 'drm-fixes' of git://git.kernel.org/pub/scm/linux/kernel/git/air... (diff) | |
| download | linux-65f8da475995f667af5298c644707dbd9d646ca6.tar.xz linux-65f8da475995f667af5298c644707dbd9d646ca6.zip | |
[S390] dasd: fix race between open and offline
The dasd_open function uses the private_data pointer of the gendisk to
find the dasd_block structure that matches the gendisk. When a DASD
device is set offline, we set the private_data pointer of the gendisk
to NULL and later remove the dasd_block structure, but there is still
a small race window, in which dasd_open could first read a pointer
from the private_data field and then try to use it, after the structure
has already been freed.
To close this race window, we will store a pointer to the dasd_devmap
structure of the base device in the private_data field. The devmap
entries are not deleted, and we already have proper locking and
reference counting in place, so that we can safely get from a devmap
pointer to the dasd_device and dasd_block structures of the device.
Signed-off-by: Stefan Weinhuber <wein@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/power')
0 files changed, 0 insertions, 0 deletions