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[S390] dcssblk: fix race in dcssblk_add_store()
[firefly-linux-kernel-4.4.55.git]
/
drivers
/
s390
/
block
/
dcssblk.c
diff --git
a/drivers/s390/block/dcssblk.c
b/drivers/s390/block/dcssblk.c
index 01fcdd91b846533a920cc3076c67bf85ca3816c2..db85f1fb131e0494dfb3e7a4838b23c269d9d36b 100644
(file)
--- 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);
* 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);
rc = dcssblk_assign_free_minor(dev_info);
if (rc) {
up_write(&dcssblk_devices_sem);