From 04f64b5756872b474d9429e3b6987ada10bb8012 Mon Sep 17 00:00:00 2001 From: Gerald Schaefer Date: Thu, 21 Aug 2008 19:46:40 +0200 Subject: [PATCH] [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 Signed-off-by: Martin Schwidefsky --- drivers/s390/block/dcssblk.c | 4 ++++ 1 file changed, 4 insertions(+) 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); -- 2.20.1