Re: [PATCH 1/2] ata: pata_parport: pin the protocol module before device_register()

On Wed, Sep 02, 2026 at 12:06:08PM +0000, sashiko-bot@kernel.org wrote:

Thank you for your contribution! Sashiko AI review found 1 potential issue(s) to consider:
- [Low] Unused label `out_unreg_dev` causes compiler warning.
--

commit 99f7607699410f6446da6e37e3bed84251a51bd8
Author: Pei Xiao [off-list ref]

ata: pata_parport: pin the protocol module before device_register()

Take the module reference before registering the device to prevent a race
condition where the device is visible but the protocol module is not yet
pinned. Also ensure the reference is dropped on the device_register()
failure path.

quoted

diff --git a/drivers/ata/pata_parport/pata_parport.c b/drivers/ata/pata_parport/pata_parport.c
index cf81a6128f552..7462f9b1acc57 100644
--- a/drivers/ata/pata_parport/pata_parport.c
+++ b/drivers/ata/pata_parport/pata_parport.c

[ ... ]

quoted

@@ -517,15 +525,12 @@ static struct pi_adapter *pi_init_one(struct parport *parport,
 	pi->dev.id = id;
 	dev_set_name(&pi->dev, "pata_parport.%u", pi->dev.id);
 	if (device_register(&pi->dev)) {
+		module_put(pi->proto->owner);
 		put_device(&pi->dev);
 		/* pata_parport_dev_release will do ida_free(dev->id) and kfree(pi) */
 		return NULL;
 	}
 
-	pi->proto = pr;
-
-	if (!try_module_get(pi->proto->owner))
-		goto out_unreg_dev;

[Severity: Low]
Does removing this goto leave the out_unreg_dev label unused at the bottom
of pi_init_one()?

If the label is no longer referenced, compiling the kernel will emit a
-Wunused-label warning. This can cause build failures in configurations
that enforce -Werror.

We don't want to introduce any new build warnings.

W=1 builds are important too, even if not default.


Kind regards,
Niklas