[SLOF] [PATCH] dev-null: The "read" function has to return 0 if nothing has been read

Alexey Kardashevskiy aik at ozlabs.ru
Wed Feb 24 11:39:40 AEDT 2016

On 02/24/2016 01:54 AM, Laurent Vivier wrote:
> On 23/02/2016 15:40, Thomas Huth wrote:
>> The "read" function of the dev-null device currently claims that
>> the same amount of bytes has been read as input bytes have been
>> requested. This causes grub to hang forever at the boot selection
>> menu, since grub then thinks that there's a continuous stream of input
>> data. If nothing has been read (which is always the case for the
>> dev-null device), the "read" function should simply return 0 instead.
>> Then grub also boots properly again after the typical short timeout.
>> Reported-by: Laurent Vivier <lvivier at redhat.com>
>> Signed-off-by: Thomas Huth <thuth at redhat.com>
> Tested-by: Laurent Vivier <lvivier at redhat.com>

Thanks, applied.

But how did you get this hang? How come that I've never seen that?


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