diff options
| author |   Stefan Haberland <stefan.haberland@de.ibm.com> | 2010-02-26 22:37:46 +0100 |
|---|---|---|
| committer |   Martin Schwidefsky <sky@mschwide.boeblingen.de.ibm.com> | 2010-02-26 22:37:32 +0100 |
| commit | 9eb251225ab4dbea3119cfcf4c5194eed223a740 (patch) | |
| tree | 6305782cf36aee2949b7a6d1661db24ef618e2ce /drivers/s390/block/dasd_genhd.c | |
| parent | [S390] use kprobes_built_in() in mm/fault code (diff) | |
| download | linux-dev-9eb251225ab4dbea3119cfcf4c5194eed223a740.tar.xz linux-dev-9eb251225ab4dbea3119cfcf4c5194eed223a740.zip | |
[S390] dasd: fix online/offline race
Setting a DASD online and offline in quick succession may cause
a kernel panic or let the chhccwdev command wait forever.
The Online process is split into two parts. After the first part
is finished the offline process may be called. This may result
in a situation where the second online processing part tries to
set the DASD offline as well.
Use a mutex to protect online and offline against each other.
Also correct some checking.
Signed-off-by: Stefan Haberland <stefan.haberland@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'drivers/s390/block/dasd_genhd.c')
| -rw-r--r-- | drivers/s390/block/dasd_genhd.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/s390/block/dasd_genhd.c b/drivers/s390/block/dasd_genhd.c index d3198303b93c..94f92a1247f2 100644 --- a/drivers/s390/block/dasd_genhd.c +++ b/drivers/s390/block/dasd_genhd.c @@ -88,6 +88,7 @@ void dasd_gendisk_free(struct dasd_block *block) if (block->gdp) { del_gendisk(block->gdp); block->gdp->queue = NULL; + block->gdp->private_data = NULL; put_disk(block->gdp); block->gdp = NULL; } |