linux-kernel - [PATCH] firmware: xilinx: Fix an error handling path in 'zynqmp_firmware

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Date:   Sun, 10 May 2020 15:03:57 +0200
From:   Christophe JAILLET <christophe.jaillet@...adoo.fr>
To:     michal.simek@...inx.com, rajan.vaja@...inx.com,
        jolly.shah@...inx.com, gregkh@...uxfoundation.org,
        tejas.patel@...inx.com, manish.narani@...inx.com,
        ravi.patel@...inx.com
Cc:     linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org,
        kernel-janitors@...r.kernel.org,
        Christophe JAILLET <christophe.jaillet@...adoo.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@...adoo.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.
---
 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);
 }
 
-- 
2.25.1