On 18.01.22 15:41, Andrew Cooper wrote:
> On 16/01/2022 08:33, Juergen Gross wrote:
>> diff --git a/blkfront.c b/blkfront.c
>> index e3f42bef..ed902702 100644
>> --- a/blkfront.c
>> +++ b/blkfront.c
>> @@ -483,9 +483,13 @@ int blkfront_aio_poll(struct blkfront_dev *dev)
>>   
>>   moretodo:
>>   #ifdef HAVE_LIBC
>> -    if (dev->fd != -1) {
>> -        files[dev->fd].read = false;
>> -        mb(); /* Make sure to let the handler set read to 1 before we start looking at the ring */
>> +    {
>> +        struct file *file = get_file_from_fd(dev->fd);
>> +
>> +        if ( file ) {
> 
> Style, as this is is being indented.

Oh, missed that one. :-(

> 
>> +            file->read = false;
>> +            mb(); /* Make sure to let the handler set read to 1 before we start looking at the ring */
> 
> MiniOS is in desperate need of being dragged over to LKMM, and to stop
> using inappropriate fences.  Things will go much faster when these have
> all been corrected to smp barriers.

Indeed.


Juergen