Hi, The cause of the OOPS message depends on the processing performed by your patch. The occurence of successive interrupts may not be a problem because when an interrupt handler is executing, that particular interrupt is disabled in case of slow interrupts whereas all other interrupts are disabled in case of fast handler. You can split the interupt handler into two halves i.e. top half & bottom half. Keep the top half handler as small as possible and shift the bulk amount of processing to the bottom half handler. The description of the two halves is explained in Linux device driver edition 2 (Alexandro Rubini) Regards, Anj ----- Original Message ----- From: "Chandan K Shanbhag" <cshanbha@students.uiuc.edu> To: <kernelnewbies@nl.linux.org> Sent: Wednesday, November 13, 2002 1:25 AM Subject: newbie - interrupt handler problems > hi > I am writing a patch to the 2.4.19 kernel to measure statistics of > packets sent on the n/w interfaces. I have a function that is called when > net/core/dev.c:net_rx_action() is invoked to record received > packets. > Now this works fine when small amounts of data are sent on the > n/w. But doing a huge file transfer brings about a panic. > The trace says a NULL pointer reference occured and that the > interrupt handler was killed. The EIP > points to an instruction in my routine (as figured from System.map). I am > checking for NULL values before I access anything. > This is what I think is the problem. This routine of mine takes > too long to be part of an interrupt handler. So, when I am doing a massive > data transfer, the device is probably sending more interrupts than can be > handled and something goes bad. Is this possible? And how do I fix this. > > OR more generally, if I have a interrupt handler which takes long, > is there some trick by which I can do less work in the handler and move > the bulk of the work somewhere else. > > Thanks in advance > Chandan > > > -- > Kernelnewbies: Help each other learn about the Linux kernel. > Archive: http://mail.nl.linux.org/kernelnewbies/ > FAQ: http://kernelnewbies.org/faq/ > > -- Kernelnewbies: Help each other learn about the Linux kernel. Archive: http://mail.nl.linux.org/kernelnewbies/ FAQ: http://kernelnewbies.org/faq/
