On 2024/6/19 9:38, Ming Lei wrote:
Target debugfs entry is removed via async_schedule() which isn't drained
when adding same name target, so failure of "Directory 'target11:0:0' with
parent 'scsi_debug' already present!" can be triggered easily.
Fix it by switching to domain async schedule, and draining it before
adding new target debugfs entry.
Thank you for the fix, the change is looks good to me.
Cc: Wenchao Hao <haowenchao2@xxxxxxxxxx>
Fixes: f084fe52c640 ("scsi: scsi_debug: Add debugfs interface to fail target reset")
Signed-off-by: Ming Lei <ming.lei@xxxxxxxxxx>
---
drivers/scsi/scsi_debug.c | 6 +++++-
1 file changed, 5 insertions(+), 1 deletion(-)
diff --git a/drivers/scsi/scsi_debug.c b/drivers/scsi/scsi_debug.c
index acf0592d63da..91f022fb8d0c 100644
--- a/drivers/scsi/scsi_debug.c
+++ b/drivers/scsi/scsi_debug.c
@@ -926,6 +926,7 @@ static const int device_qfull_result =
static const int condition_met_result = SAM_STAT_CONDITION_MET;
static struct dentry *sdebug_debugfs_root;
+static ASYNC_DOMAIN_EXCLUSIVE(sdebug_async_domain);
static void sdebug_err_free(struct rcu_head *head)
{
@@ -1148,6 +1149,8 @@ static int sdebug_target_alloc(struct scsi_target *starget)
if (!targetip)
return -ENOMEM;
+ async_synchronize_full_domain(&sdebug_async_domain);
+
targetip->debugfs_entry = debugfs_create_dir(dev_name(&starget->dev),
sdebug_debugfs_root);
@@ -1174,7 +1177,8 @@ static void sdebug_target_destroy(struct scsi_target *starget)
targetip = (struct sdebug_target_info *)starget->hostdata;
if (targetip) {
starget->hostdata = NULL;
- async_schedule(sdebug_tartget_cleanup_async, targetip);
+ async_schedule_domain(sdebug_tartget_cleanup_async, targetip,
+ &sdebug_async_domain);
}
}
