linux-kernel - [PATCH v3 05/23] ata: libahci_platform: Explicitly set rc on devres

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Message-ID: <20220511231810.4928-6-Sergey.Semin@baikalelectronics.ru>
Date:   Thu, 12 May 2022 02:17:52 +0300
From:   Serge Semin <Sergey.Semin@...kalelectronics.ru>
To:     Damien Le Moal <damien.lemoal@...nsource.wdc.com>,
        Hans de Goede <hdegoede@...hat.com>,
        Jens Axboe <axboe@...nel.dk>
CC:     Serge Semin <Sergey.Semin@...kalelectronics.ru>,
        Serge Semin <fancer.lancer@...il.com>,
        Alexey Malahov <Alexey.Malahov@...kalelectronics.ru>,
        Pavel Parkhomenko <Pavel.Parkhomenko@...kalelectronics.ru>,
        Rob Herring <robh+dt@...nel.org>, <linux-ide@...r.kernel.org>,
        <linux-kernel@...r.kernel.org>, <devicetree@...r.kernel.org>
Subject: [PATCH v3 05/23] ata: libahci_platform: Explicitly set rc on devres_alloc failure

It's better for readability and maintainability to explicitly assign an
error number to the variable used then as a return value from the method
on the cleanup-on-error path. So adding new code in the method we won't
have to think whether the overridden rc-variable is set afterward in case
of an error. Saving one line of code doesn't worth it especially seeing
the rest of the ahci_platform_get_resources() function errors handling
blocks do explicitly write errno to rc.

Signed-off-by: Serge Semin <Sergey.Semin@...kalelectronics.ru>

---

Changelog v2:
- Drop rc variable initialization (@Damien)
---
 drivers/ata/libahci_platform.c | 6 ++++--
 1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/drivers/ata/libahci_platform.c b/drivers/ata/libahci_platform.c
index 32495ae96567..f7f9bfcfc164 100644
--- a/drivers/ata/libahci_platform.c
+++ b/drivers/ata/libahci_platform.c
@@ -389,7 +389,7 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 	struct ahci_host_priv *hpriv;
 	struct clk *clk;
 	struct device_node *child;
-	int i, enabled_ports = 0, rc = -ENOMEM, child_nodes;
+	int i, enabled_ports = 0, rc, child_nodes;
 	u32 mask_port_map = 0;
 
 	if (!devres_open_group(dev, NULL, GFP_KERNEL))
@@ -397,8 +397,10 @@ struct ahci_host_priv *ahci_platform_get_resources(struct platform_device *pdev,
 
 	hpriv = devres_alloc(ahci_platform_put_resources, sizeof(*hpriv),
 			     GFP_KERNEL);
-	if (!hpriv)
+	if (!hpriv) {
+		rc = -ENOMEM;
 		goto err_out;
+	}
 
 	devres_add(dev, hpriv);
 
-- 
2.35.1