| Message ID | 20240619013803.3008857-1-ming.lei@redhat.com |
|---|---|
| State | New |
| Headers | show |
| Series | scsi: scsi_debug: fix create target debugfs failure | expand |
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@huawei.com> > Fixes: f084fe52c640 ("scsi: scsi_debug: Add debugfs interface to fail target reset") > Signed-off-by: Ming Lei <ming.lei@redhat.com> > --- > 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); > } > } >
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); } }
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. Cc: Wenchao Hao <haowenchao2@huawei.com> Fixes: f084fe52c640 ("scsi: scsi_debug: Add debugfs interface to fail target reset") Signed-off-by: Ming Lei <ming.lei@redhat.com> --- drivers/scsi/scsi_debug.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-)