Re: [Xen-devel] [PATCH] Fix blkback/blktap sysfs read bug.

["Jan Beulich" <JBeulich@xxxxxxxxxx>]

>>> "Joe Jin" <joe.jin@xxxxxxxxxx> 20.01.10 11:51 >>>
>On 2010-01-20 07:46, Jan Beulich wrote:
>> And btw., in both cases with the lock added there's no need to check
>> both 'be' and 'be->blkif', since be->blkif can't be NULL when be is
>> non-NULL.
>
>No we must check it, as I have methioned, root cause is vbd was been
>freed after open sysfs file.

Why? You're inside the locked region, so either 'be' is NULL, or both
'be' and 'be->blkif' are non-NULL.

Jan


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