linux-kernel - Re: [PATCH V2 2/4] mailbox: zynqmp-ipi: Remove dev.parent check in zynqmp_ipi_free

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Message-ID: <20250929104659.GB15568@nxa18884-linux.ap.freescale.net>
Date: Mon, 29 Sep 2025 18:46:59 +0800
From: Peng Fan <peng.fan@....nxp.com>
To: Harini T <harini.t@....com>
Cc: jassisinghbrar@...il.com, michal.simek@....com, peng.fan@....com,
	linux-kernel@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	git@....com
Subject: Re: [PATCH V2 2/4] mailbox: zynqmp-ipi: Remove dev.parent check in
 zynqmp_ipi_free_mboxes

On Mon, Sep 29, 2025 at 01:07:21PM +0530, Harini T wrote:
>The ipi_mbox->dev.parent check is unreliable proxy for registration
>status as it fails to protect against probe failures that occur after
>the parent is assigned but before device_register() completes.
>
>device_is_registered() is the canonical and robust method to verify the
>registration status.
>
>Remove ipi_mbox->dev.parent check in zynqmp_ipi_free_mboxes().
>
>Fixes: 4981b82ba2ff ("mailbox: ZynqMP IPI mailbox controller")
>Signed-off-by: Harini T <harini.t@....com>

Reviewed-by: Peng Fan <peng.fan@....com>