linux-kernel - [PATCH v1 2/2] ACPI: NFIT: Use modern scope based rollback

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Message-ID: <20230926184520.2239723-3-michal.wilczynski@intel.com>
Date:   Tue, 26 Sep 2023 21:45:20 +0300
From:   Michal Wilczynski <michal.wilczynski@...el.com>
To:     linux-acpi@...r.kernel.org, linux-kernel@...r.kernel.org,
        nvdimm@...ts.linux.dev
Cc:     rafael.j.wysocki@...el.com, andriy.shevchenko@...el.com,
        lenb@...nel.org, dan.j.williams@...el.com,
        vishal.l.verma@...el.com, ira.weiny@...el.com,
        Michal Wilczynski <michal.wilczynski@...el.com>,
        Dave Jiang <dave.jiang@...el.com>,
        Andy Shevchenko <andy.shevchenko@...il.com>
Subject: [PATCH v1 2/2] ACPI: NFIT: Use modern scope based rollback

Change rollback in acpi_nfit_init_interleave_set() to use modern scope
based attribute __free(). This is similar to C++ RAII and is a preferred
way for handling local memory allocations.

Suggested-by: Dave Jiang <dave.jiang@...el.com>
Suggested-by: Andy Shevchenko <andy.shevchenko@...il.com>
Signed-off-by: Michal Wilczynski <michal.wilczynski@...el.com>
---
 drivers/acpi/nfit/core.c | 32 ++++++++++----------------------
 1 file changed, 10 insertions(+), 22 deletions(-)

diff --git a/drivers/acpi/nfit/core.c b/drivers/acpi/nfit/core.c
index 78f0f855c4de..079bd663495f 100644
--- a/drivers/acpi/nfit/core.c
+++ b/drivers/acpi/nfit/core.c
@@ -2257,29 +2257,23 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 		struct nd_region_desc *ndr_desc,
 		struct acpi_nfit_system_address *spa)
 {
+	u16 nr = ndr_desc->num_mappings;
+	struct nfit_set_info2 *info2 __free(kfree) =
+		kcalloc(nr, sizeof(*info2), GFP_KERNEL);
+	struct nfit_set_info *info __free(kfree) =
+		kcalloc(nr, sizeof(*info), GFP_KERNEL);
 	struct device *dev = acpi_desc->dev;
 	struct nd_interleave_set *nd_set;
-	u16 nr = ndr_desc->num_mappings;
-	struct nfit_set_info2 *info2;
-	struct nfit_set_info *info;
-	int err = 0;
 	int i;
 
+	if (!info || !info2)
+		return -ENOMEM;
+
 	nd_set = devm_kzalloc(dev, sizeof(*nd_set), GFP_KERNEL);
 	if (!nd_set)
 		return -ENOMEM;
 	import_guid(&nd_set->type_guid, spa->range_guid);
 
-	info = kcalloc(nr, sizeof(*info), GFP_KERNEL);
-	if (!info)
-		return -ENOMEM;
-
-	info2 = kcalloc(nr, sizeof(*info2), GFP_KERNEL);
-	if (!info2) {
-		err = -ENOMEM;
-		goto free_info;
-	}
-
 	for (i = 0; i < nr; i++) {
 		struct nd_mapping_desc *mapping = &ndr_desc->mapping[i];
 		struct nvdimm *nvdimm = mapping->nvdimm;
@@ -2292,8 +2286,7 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 
 		if (!memdev || !nfit_mem->dcr) {
 			dev_err(dev, "%s: failed to find DCR\n", __func__);
-			err = -ENODEV;
-			goto free_info2;
+			return -ENODEV;
 		}
 
 		map->region_offset = memdev->region_offset;
@@ -2342,12 +2335,7 @@ static int acpi_nfit_init_interleave_set(struct acpi_nfit_desc *acpi_desc,
 
 	ndr_desc->nd_set = nd_set;
 
-free_info2:
-	kfree(info2);
-free_info:
-	kfree(info);
-
-	return err;
+	return 0;
 }
 
 static int ars_get_cap(struct acpi_nfit_desc *acpi_desc,
-- 
2.41.0