linux-kernel - [PATCH 2/3] mmc: sdhci-acpi: Check device status before calling fix_up

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Message-Id: <20170225172357.26294-3-hdegoede@redhat.com>
Date:   Sat, 25 Feb 2017 18:23:56 +0100
From:   Hans de Goede <hdegoede@...hat.com>
To:     Adrian Hunter <adrian.hunter@...el.com>,
        Ulf Hansson <ulf.hansson@...aro.org>,
        Jean Delvare <jdelvare@...e.com>
Cc:     Hans de Goede <hdegoede@...hat.com>, Takashi Iwai <tiwai@...e.de>,
        "russianneuromancer @ ya . ru" <russianneuromancer@...ru>,
        linux-mmc@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [PATCH 2/3] mmc: sdhci-acpi: Check device status before calling fix_up_power()

Calling acpi_device_fix_up_power() on a device which is not present
is not a good idea.

While at it also call acpi_bus_get_status() on the children before
the status check to make sure that child->status contains valid data.

Signed-off-by: Hans de Goede <hdegoede@...hat.com>
---
 drivers/mmc/host/sdhci-acpi.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/mmc/host/sdhci-acpi.c b/drivers/mmc/host/sdhci-acpi.c
index 96465ff..873beae 100644
--- a/drivers/mmc/host/sdhci-acpi.c
+++ b/drivers/mmc/host/sdhci-acpi.c
@@ -394,15 +394,15 @@ static int sdhci_acpi_probe(struct platform_device *pdev)
 	if (acpi_bus_get_device(handle, &device))
 		return -ENODEV;
 
+	if (acpi_bus_get_status(device) || !device->status.present)
+		return -ENODEV;
+
 	/* Power on the SDHCI controller and its children */
 	acpi_device_fix_up_power(device);
 	list_for_each_entry(child, &device->children, node)
 		if (child->status.present && child->status.enabled)
 			acpi_device_fix_up_power(child);
 
-	if (acpi_bus_get_status(device) || !device->status.present)
-		return -ENODEV;
-
 	if (sdhci_acpi_byt_defer(dev))
 		return -EPROBE_DEFER;
 
-- 
2.9.3