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| author | Gerald Schaefer | 2008-08-21 19:46:40 +0200 |
|---|---|---|
| committer | Martin Schwidefsky | 2008-08-21 19:46:42 +0200 |
| commit | 04f64b5756872b474d9429e3b6987ada10bb8012 (patch) | |
| tree | 3a772f76a2fdbd6e570611202736b1f53b2e4c2d | |
| parent | [S390] cio: call ccw driver notify function with lock held (diff) | |
| download | kernel-qcow2-linux-04f64b5756872b474d9429e3b6987ada10bb8012.tar.gz kernel-qcow2-linux-04f64b5756872b474d9429e3b6987ada10bb8012.tar.xz kernel-qcow2-linux-04f64b5756872b474d9429e3b6987ada10bb8012.zip | |
[S390] dcssblk: fix race in dcssblk_add_store()
Concurrently adding the same segment may lead to duplicate device_register()
calls, which will trigger an error in kobject code:
"... don't try to register things with the same name in the same directory".
This patch adds a check to avoid this.
Signed-off-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | drivers/s390/block/dcssblk.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/drivers/s390/block/dcssblk.c b/drivers/s390/block/dcssblk.c index 01fcdd91b846..db85f1fb131e 100644 --- a/drivers/s390/block/dcssblk.c +++ b/drivers/s390/block/dcssblk.c @@ -384,6 +384,10 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char * get minor, add to list */ down_write(&dcssblk_devices_sem); + if (dcssblk_get_segment_by_name(local_buf)) { + rc = -EEXIST; + goto release_gd; + } rc = dcssblk_assign_free_minor(dev_info); if (rc) { up_write(&dcssblk_devices_sem); |