Hi, Le Wed, 25 Oct 2006 14:03:50 -0500, Dinesh <dbhat@xxxxxxxxx> a écrit : > Our PCI drivers work alright on most of the systems with different > Linux flavours. On 2.6.17 and above systems, when our PCI device > shares irq with other devices, kernel generates irq 12: nobody cared > errors. Our driver implements irq_handler method and returns > IRQ_HANDLED. We are trying to reproduce the problem. However, on the > machines we are testing it, irq is not being shared. Thus, we do not > see a similar behavior. <disclaimer> The following is the result of some random readings of documentation about the kernel. May be completely true, completely false, or any variation in between. </disclaimer> If the interrupt is shared, I think that your interrupt handler must check if the interrupt was for him. If not, it should return IRQ_NONE, if yes, it should return IRQ_HANDLED. If you always return IRQ_HANDLED, then the IRQ sharing mechanism won't work. See page 15 and page 21 of http://lwn.net/images/pdf/LDD3/ch10.pdf. Sincerly, Thomas -- Thomas Petazzoni - thomas.petazzoni@xxxxxxxx http://{thomas,sos,kos}.enix.org - http://www.toulibre.org http://www.{livret,agenda}dulibre.org -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
