I'm porting a driver for a DAC board from 2.0 to 2.2. Since I'm learning
kernel programming as I do this, I have some questions about how to make
this driver SMP aware.
After reading this article,
http://news.tucows.com/ext2/99/11/articles/ext2112919991.shtml, I was
left wondering about when to use the spinlocks.
A piece of code like this:
for (i=0;i<count;i++)
outb(*buf++, addr);
should be protected in all SMP instances? As in:
spin_lock(&lock);
for (i=0;i<count;i++)
outb(*buf++, addr);
spin_unlock(&lock);
How about:
for (i=0;i<count;i++)
*dest++ = inb(addr);
should a spinlock be placed here too?
Thanks.
-- Rafael Herrera Laboratory for Computational Neuroscience University of Pittsburgh http://www.neuronet.pitt.edu/~raffo- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.rutgers.edu Please read the FAQ at http://www.tux.org/lkml/