linux-kernel - [PATCH] mailbox: pcc: Put the PCCT table for error path

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Date:   Wed, 22 Jul 2020 17:40:40 +0800
From:   Hanjun Guo <guohanjun@...wei.com>
To:     Jassi Brar <jassisinghbrar@...il.com>
CC:     <linux-kernel@...r.kernel.org>, Hanjun Guo <guohanjun@...wei.com>
Subject: [PATCH] mailbox: pcc: Put the PCCT table for error path

The acpi_get_table() should be coupled with acpi_put_table() if
the mapped table is not used at runtime to release the table
mapping.

In acpi_pcc_probe(), the PCCT table entries will be used as private
data for communication chan at runtime, but the table should be put
for error path.

Signed-off-by: Hanjun Guo <guohanjun@...wei.com>
---
 drivers/mailbox/pcc.c | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/drivers/mailbox/pcc.c b/drivers/mailbox/pcc.c
index 8c7fac3..ef9ecd1 100644
--- a/drivers/mailbox/pcc.c
+++ b/drivers/mailbox/pcc.c
@@ -457,14 +457,17 @@ static int __init acpi_pcc_probe(void)
 			pr_warn("Error parsing PCC subspaces from PCCT\n");
 		else
 			pr_warn("Invalid PCCT: %d PCC subspaces\n", count);
-		return -EINVAL;
+
+		rc = -EINVAL;
+		goto err_put_pcct;
 	}
 
 	pcc_mbox_channels = kcalloc(count, sizeof(struct mbox_chan),
 				    GFP_KERNEL);
 	if (!pcc_mbox_channels) {
 		pr_err("Could not allocate space for PCC mbox channels\n");
-		return -ENOMEM;
+		rc = -ENOMEM;
+		goto err_put_pcct;
 	}
 
 	pcc_doorbell_vaddr = kcalloc(count, sizeof(void *), GFP_KERNEL);
@@ -535,6 +538,8 @@ static int __init acpi_pcc_probe(void)
 	kfree(pcc_doorbell_vaddr);
 err_free_mbox:
 	kfree(pcc_mbox_channels);
+err_put_pcct:
+	acpi_put_table(pcct_tbl);
 	return rc;
 }
 
-- 
1.7.12.4