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| author | Boaz Harrosh <bharrosh@panasas.com> | 2009-11-16 20:44:02 +0200 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@suse.de> | 2009-12-04 12:01:45 -0600 |
| commit | 89f5e1f2f13b1079b8d7ff7d3ade345b7ad7c009 (patch) | |
| tree | e2a6c1a93428c870561646558666e2a01d05a5fa /drivers/scsi/osd/osd_uld.c | |
| parent | c7d2dc2a204fa37bdf607d4d062dfd14e392aaf1 (diff) | |
| download | linux-89f5e1f2f13b1079b8d7ff7d3ade345b7ad7c009.tar.gz linux-89f5e1f2f13b1079b8d7ff7d3ade345b7ad7c009.tar.bz2 linux-89f5e1f2f13b1079b8d7ff7d3ade345b7ad7c009.zip | |
[SCSI] osduld: Ref-counting bug fix
If scsi has released the device (logout), and exofs has last
reference on the osduld_device it will be freed by
osd_uld_release() within the call to fput(). But this will
oops in cdev_release() which is called after the fops->release.
(cdev is embedded within osduld_device). __uld_get/put pair
makes sure we have a cdev for the duration of fput()
Signed-off-by: Boaz Harrosh <bharrosh@panasas.com>
Signed-off-by: James Bottomley <James.Bottomley@suse.de>
Diffstat (limited to 'drivers/scsi/osd/osd_uld.c')
| -rw-r--r-- | drivers/scsi/osd/osd_uld.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/drivers/scsi/osd/osd_uld.c b/drivers/scsi/osd/osd_uld.c index 0bdef3390902..1ea6447f9418 100644 --- a/drivers/scsi/osd/osd_uld.c +++ b/drivers/scsi/osd/osd_uld.c @@ -224,7 +224,15 @@ void osduld_put_device(struct osd_dev *od) BUG_ON(od->scsi_device != oud->od.scsi_device); + /* If scsi has released the device (logout), and exofs has last + * reference on oud it will be freed by above osd_uld_release + * within fput below. But this will oops in cdev_release which + * is called after the fops->release. __uld_get/put pair makes + * sure we have a cdev for the duration of fput + */ + __uld_get(oud); fput(od->file); + __uld_put(oud); kfree(od); } } |