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SubjectRe: [PATCH] firmware: xilinx: Fix an error handling path in 'zynqmp_firmware_probe()'
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Reviewed-by: Jolly Shah <jolly.shah@xilinx.com>

> ------Original Message------
> From: Christophe Jaillet <christophe.jaillet@wanadoo.fr>
> Sent: Sunday, May 10, 2020 6:03AM
> To: Michal Simek <michal.simek@xilinx.com>, Rajan Vaja
<rajan.vaja@xilinx.com>, Jolly Shah <jolly.shah@xilinx.com>, 'Greg Kh'
<gregkh@linuxfoundation.org>, Tejas Patel <tejas.patel@xilinx.com>,
Manish Narani <manish.narani@xilinx.com>, Ravi Patel <ravi.patel@xilinx.com>
> Cc: Linux-arm-kernel@lists.infradead.org
<linux-arm-kernel@lists.infradead.org>, Linux-kernel@vger.kernel.org
<linux-kernel@vger.kernel.org>, Kernel-janitors
<kernel-janitors@vger.kernel.org>, Christophe Jaillet
<christophe.jaillet@wanadoo.fr>
> Subject: [PATCH] firmware: xilinx: Fix an error handling path in
'zynqmp_firmware_probe()'
>
> If 'mfd_add_devices()' fails, we must undo 'zynqmp_pm_api_debugfs_init()'
> otherwise some debugfs directory and files will be left.
>
> Just move the call to 'zynqmp_pm_api_debugfs_init()' a few lines below to
> fix the issue.
>
> Fixes: e23d9c6d0d49 ("drivers: soc: xilinx: Add ZynqMP power domain driver")
> Signed-off-by: Christophe JAILLET <christophe.jaillet@wanadoo.fr>
> ---
> Not related to this fix, but I think that:
> - a call to 'of_platform_depopulate()' is missing in the remove function
> - we shouldn't return of_platform_populate(); directly because we
> don't have the opportunity to call 'mfd_remove_devices()' as done in
> the remove function, and 'of_platform_depopulate()' for what have
> been populated yet
>
> I'm not familiar with this API, so I just point it out to get feedback.

Agree. This needs to be fixed.

Thanks,
Jolly Shah


> ---
> drivers/firmware/xilinx/zynqmp.c | 4 ++--
> 1 file changed, 2 insertions(+), 2 deletions(-)
>
> diff --git a/drivers/firmware/xilinx/zynqmp.c b/drivers/firmware/xilinx/zynqmp.c
> index 8095fa84d5d7..8d1ff2454e2e 100644
> --- a/drivers/firmware/xilinx/zynqmp.c
> +++ b/drivers/firmware/xilinx/zynqmp.c
> @@ -1235,8 +1235,6 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
> pr_info("%s Trustzone version v%d.%d\n", __func__,
> pm_tz_version >> 16, pm_tz_version & 0xFFFF);
>
> - zynqmp_pm_api_debugfs_init();
> -
> ret = mfd_add_devices(&pdev->dev, PLATFORM_DEVID_NONE, firmware_devs,
> ARRAY_SIZE(firmware_devs), NULL, 0, NULL);
> if (ret) {
> @@ -1244,6 +1242,8 @@ static int zynqmp_firmware_probe(struct platform_device *pdev)
> return ret;
> }
>
> + zynqmp_pm_api_debugfs_init();
> +
> return of_platform_populate(dev->of_node, NULL, NULL, dev);
> }
>
>

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