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i2c: Not all adapters have a parent

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The code in acpi_i2c_register_devices() assumes that all i2c adapters
have a parent. This is not necessarily the case, for example the
i2c-stub driver instantiate a virtual i2c adapter without a parent.
Check for this to avoid a NULL pointer deference.

Signed-off-by: Jean Delvare <jdelvare@suse.de>
Acked-by: Mika Westerberg <mika.westerberg@linux.intel.com>
Signed-off-by: Wolfram Sang <wsa@the-dreams.de>
This commit is contained in:
Jean Delvare 2013-10-10 08:04:06 +02:00 committed by Wolfram Sang
parent 6d2cfb1097
commit 47b6e477ed
1 changed files with 3 additions and 0 deletions
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3
drivers/i2c/i2c-core.c
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@ -1134,6 +1134,9 @@ static void acpi_i2c_register_devices(struct i2c_adapter *adap)
acpi_handle handle; acpi_handle handle;
acpi_status status; acpi_status status;
if (!adap->dev.parent)
return;
handle = ACPI_HANDLE(adap->dev.parent); handle = ACPI_HANDLE(adap->dev.parent);
if (!handle) if (!handle)
return; return;