Re: [PATCH v3 05/23] ata: libahci_platform: Explicitly set rc on devres_alloc failure

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On 5/12/22 01:17, Serge Semin wrote:
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@xxxxxxxxxxxxxxxxxxxx>

---

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);
I disagree.
As 'rc' is now only initialized within a conditional we're risking 'rc' will be left uninitialized. And in the end, it's a matter of style; this patch doesn't change the flow of events and the benefits are hard to see.

Cheers,

Hannes
--
Dr. Hannes Reinecke		           Kernel Storage Architect
hare@xxxxxxx			                  +49 911 74053 688
SUSE Software Solutions Germany GmbH, Maxfeldstr. 5, 90409 Nürnberg
HRB 36809 (AG Nürnberg), GF: Felix Imendörffer



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