[PATCH v2] mailbox: pcc: Add missed acpi_put_table() to fix memory leak

[Zhen Ni <zhen.ni@easystack.cn>]

In pcc_mbox_probe(), the PCCT table acquired via acpi_get_table()
is only released in error paths but not in the success path. This
leads to a permanent ACPI memory leak when the driver successfully
initializes.

Fixes: ce028702ddbc ("mailbox: pcc: Move bulk of PCCT parsing into pcc_mbox_probe")
Cc: stable@vger.kernel.org
Signed-off-by: Zhen Ni <zhen.ni@easystack.cn>
---
Changes in v2:
- Add tags of 'Fixes' and 'Cc'
- Change goto target from out_put_pcct to e_nomem
---
 drivers/mailbox/pcc.c | 17 ++++++++---------
 1 file changed, 8 insertions(+), 9 deletions(-)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index f6714c233f5a..b5b4e3665593 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -763,19 +763,19 @@ static int pcc_mbox_probe(struct platform_device *pdev)
 					 GFP_KERNEL);
 	if (!pcc_mbox_channels) {
 		rc = -ENOMEM;
-		goto err;
+		goto e_nomem;
 	}
 
 	chan_info = devm_kcalloc(dev, count, sizeof(*chan_info), GFP_KERNEL);
 	if (!chan_info) {
 		rc = -ENOMEM;
-		goto err;
+		goto e_nomem;
 	}
 
 	pcc_mbox_ctrl = devm_kzalloc(dev, sizeof(*pcc_mbox_ctrl), GFP_KERNEL);
 	if (!pcc_mbox_ctrl) {
 		rc = -ENOMEM;
-		goto err;
+		goto e_nomem;
 	}
 
 	/* Point to the first PCC subspace entry */
@@ -796,17 +796,17 @@ static int pcc_mbox_probe(struct platform_device *pdev)
 		    !pcc_mbox_ctrl->txdone_irq) {
 			pr_err("Platform Interrupt flag must be set to 1");
 			rc = -EINVAL;
-			goto err;
+			goto e_nomem;
 		}
 
 		if (pcc_mbox_ctrl->txdone_irq) {
 			rc = pcc_parse_subspace_irq(pchan, pcct_entry);
 			if (rc < 0)
-				goto err;
+				goto e_nomem;
 		}
 		rc = pcc_parse_subspace_db_reg(pchan, pcct_entry);
 		if (rc < 0)
-			goto err;
+			goto e_nomem;
 
 		pcc_parse_subspace_shmem(pchan, pcct_entry);
 
@@ -827,9 +827,8 @@ static int pcc_mbox_probe(struct platform_device *pdev)
 	rc = mbox_controller_register(pcc_mbox_ctrl);
 	if (rc)
 		pr_err("Err registering PCC as Mailbox controller: %d\n", rc);
-	else
-		return 0;
-err:
+
+e_nomem:
 	acpi_put_table(pcct_tbl);
 	return rc;
 }
-- 
2.20.1