@@ -453,8 +453,8 @@ static int initialize_controller(struct scsi_device *sdev,
if (!h->ctlr)
err = SCSI_DH_RES_TEMP_UNAVAIL;
else {
- list_add_rcu(&h->node, &h->ctlr->dh_list);
h->sdev = sdev;
+ list_add_rcu(&h->node, &h->ctlr->dh_list);
}
spin_unlock(&list_lock);
err = SCSI_DH_OK;
@@ -778,11 +778,11 @@ static void rdac_bus_detach( struct scsi_device *sdev )
spin_lock(&list_lock);
if (h->ctlr) {
list_del_rcu(&h->node);
- h->sdev = NULL;
kref_put(&h->ctlr->kref, release_controller);
}
spin_unlock(&list_lock);
sdev->handler_data = NULL;
+ synchronize_rcu();
kfree(h);
}
We get follow BUG_ON when rdac scan: [595952.944297] kernel BUG at drivers/scsi/device_handler/scsi_dh_rdac.c:427! [595952.951143] Internal error: Oops - BUG: 0 [#1] SMP ...... [595953.251065] Call trace: [595953.259054] check_ownership+0xb0/0x118 [595953.269794] rdac_bus_attach+0x1f0/0x4b0 [595953.273787] scsi_dh_handler_attach+0x3c/0xe8 [595953.278211] scsi_dh_add_device+0xc4/0xe8 [595953.282291] scsi_sysfs_add_sdev+0x8c/0x2a8 [595953.286544] scsi_probe_and_add_lun+0x9fc/0xd00 [595953.291142] __scsi_scan_target+0x598/0x630 [595953.295395] scsi_scan_target+0x120/0x130 [595953.299481] fc_user_scan+0x1a0/0x1c0 [scsi_transport_fc] [595953.304944] store_scan+0xb0/0x108 [595953.308420] dev_attr_store+0x44/0x60 [595953.312160] sysfs_kf_write+0x58/0x80 [595953.315893] kernfs_fop_write+0xe8/0x1f0 [595953.319888] __vfs_write+0x60/0x190 [595953.323448] vfs_write+0xac/0x1c0 [595953.326836] ksys_write+0x74/0xf0 [595953.330221] __arm64_sys_write+0x24/0x30 BUG_ON code is in check_ownership: list_for_each_entry_rcu(tmp, &h->ctlr->dh_list, node) { /* h->sdev should always be valid */ BUG_ON(!tmp->sdev); tmp->sdev->access_state = access_state; } rdac_bus_attach initialize_controller list_add_rcu(&h->node, &h->ctlr->dh_list); h->sdev = sdev; rdac_bus_detach list_del_rcu(&h->node); h->sdev = NULL; There is race runing rdac_bus_attach concurrently, maybe we access rdac_dh_data but h->sdev has not been set. Signed-off-by: Ye Bin <yebin10@huawei.com> --- drivers/scsi/device_handler/scsi_dh_rdac.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)