crypto: hisilicon - Adjust debugfs creation and release order

There is a scenario where the file directory is created but the
file memory is not set. In this case, if a user accesses the
file, an error occurs.

So during the creation process of debugfs, memory should be
allocated first before creating the directory. In the release
process, the directory should be deleted first before releasing
the memory to avoid the situation where the memory does not
exist when accessing the directory.

In addition, the directory released by the debugfs is a global
variable. When the debugfs of an accelerator fails to be
initialized, releasing the directory of the global variable
affects the debugfs initialization of other accelerators.
The debugfs root directory released by debugfs init should be a
member of qm, not a global variable.

Signed-off-by: Chenghai Huang <huangchenghai2@huawei.com>
Signed-off-by: Herbert Xu <herbert@gondor.apana.org.au>

1 files changed, 10 insertions, 11 deletions

diff --git a/drivers/crypto/hisilicon/hpre/hpre_main.c b/drivers/crypto/hisilicon/hpre/hpre_main.c
index d93aa6630a57..25b44416da45 100644
--- a/drivers/crypto/hisilicon/hpre/hpre_main.c
+++ b/drivers/crypto/hisilicon/hpre/hpre_main.c
@@ -1074,41 +1074,40 @@ static int hpre_debugfs_init(struct hisi_qm *qm)
 	struct device *dev = &qm->pdev->dev;
 	int ret;
 
-	qm->debug.debug_root = debugfs_create_dir(dev_name(dev),
-						  hpre_debugfs_root);
-
-	qm->debug.sqe_mask_offset = HPRE_SQE_MASK_OFFSET;
-	qm->debug.sqe_mask_len = HPRE_SQE_MASK_LEN;
 	ret = hisi_qm_regs_debugfs_init(qm, hpre_diff_regs, ARRAY_SIZE(hpre_diff_regs));
 	if (ret) {
 		dev_warn(dev, "Failed to init HPRE diff regs!\n");
-		goto debugfs_remove;
+		return ret;
 	}
 
+	qm->debug.debug_root = debugfs_create_dir(dev_name(dev),
+							hpre_debugfs_root);
+	qm->debug.sqe_mask_offset = HPRE_SQE_MASK_OFFSET;
+	qm->debug.sqe_mask_len = HPRE_SQE_MASK_LEN;
+
 	hisi_qm_debug_init(qm);
 
 	if (qm->pdev->device == PCI_DEVICE_ID_HUAWEI_HPRE_PF) {
 		ret = hpre_ctrl_debug_init(qm);
 		if (ret)
-			goto failed_to_create;
+			goto debugfs_remove;
 	}
 
 	hpre_dfx_debug_init(qm);
 
 	return 0;
 
-failed_to_create:
-	hisi_qm_regs_debugfs_uninit(qm, ARRAY_SIZE(hpre_diff_regs));
 debugfs_remove:
 	debugfs_remove_recursive(qm->debug.debug_root);
+	hisi_qm_regs_debugfs_uninit(qm, ARRAY_SIZE(hpre_diff_regs));
 	return ret;
 }
 
 static void hpre_debugfs_exit(struct hisi_qm *qm)
 {
-	hisi_qm_regs_debugfs_uninit(qm, ARRAY_SIZE(hpre_diff_regs));
-
 	debugfs_remove_recursive(qm->debug.debug_root);
+
+	hisi_qm_regs_debugfs_uninit(qm, ARRAY_SIZE(hpre_diff_regs));
 }
 
 static int hpre_pre_store_cap_reg(struct hisi_qm *qm)