[linux-dvb] buffer synchronization

[Andreas Schultz <andreas@aschultz.net>]

Hi,

When searching for the cause of the datacorruption reported on the VDR 
mallinglist under the topic of "ERROR: can't record MPEG1" i stumbled 
accross something in the DVB driver, that looks strange to me.

What i'm most interrested in is how the synchronization on the buffer in 
DmxDevBufferRead() and DmxDevBufferWrite() is supposed to work.

As far as i could see is DmxDevBufferWrite() called from an IRQ, while 
DmxDevBuffeRead() is called from a read() system call. A system call 
however can be interrupted by an IRQ at any point.
DmxDevBufferRead() is using pwrite multiple times to calculate things, 
pwrite could be modified at the same time by an DmxDevBufferWrite() 
called from an IRQ.

Could somebody please enlighten me wether the above is correct or not 
and if it could lead to DmxDevBufferRead() to return corrupted data.

Have fun

    Andreas



-- 
Info:
To unsubscribe send a mail to listar@linuxtv.org with "unsubscribe linux-dvb" as subject.