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[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>
This commit is contained in:
Gerald Schaefer 2008-08-21 19:46:40 +02:00 committed by Martin Schwidefsky
parent 91c36919a4
commit 04f64b5756
1 changed files with 4 additions and 0 deletions
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4
drivers/s390/block/dcssblk.c
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@ -384,6 +384,10 @@ dcssblk_add_store(struct device *dev, struct device_attribute *attr, const char
* get minor, add to list * get minor, add to list
*/ */
down_write(&dcssblk_devices_sem); 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); rc = dcssblk_assign_free_minor(dev_info);
if (rc) { if (rc) {
up_write(&dcssblk_devices_sem); up_write(&dcssblk_devices_sem);