[Xen-devel] [PATCH]Check the existence of serial port before using

["Chen, Huacai" <huacai.chen@xxxxxxxxx>]

Hi, Keir,
   Xen doesn't check the existence of serial ports before using in the
current version. This brings some problems, e.g., we will get a zero
value when reading a non-existent register, if this value is used as a
divider later the system will crash. We found some machines without
serial port will fail to do S3 because of this issue. The attached patch
fixed this problem.

Signed-off-by: Huacai Chen <huacai.chen@xxxxxxxxx>

Attachment: serial_check.patch
Description: serial_check.patch

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