Hello, I have a question about spinlocks and copy_to_user(): copy_to_user() can sleep so it should not be called when a spin_lock is held. However, I have data (a structure, not atomic variable) which can be changed in interrupt context in my module; so this data is protected by spinlocks. I use ioctl to pass this data to user space; this ioctl() calls copy_to_user(); when I call spin_lock_bh() before cp[y_to_user() in this ioctl , I get: "kernel: BUG: sleeping function called from invalid context at include/linux/kernel.h:155". How should I call copy_to_user() so that it won't pass wrong data to user space ? If I remove the spin_lock_bh() before the call to copy_to_user() , I have a chance to copy wrong data (to copy data while it is changing in my module ). Regards, Mark -- To unsubscribe from this list: send an email with "unsubscribe kernelnewbies" to ecartis@xxxxxxxxxxxx Please read the FAQ at http://kernelnewbies.org/FAQ
