break;
case MON_IOCQ_RING_SIZE:
+ mutex_lock(&rp->fetch_lock);
ret = rp->b_size;
+ mutex_unlock(&rp->fetch_lock);
break;
case MON_IOCT_RING_SIZE:
unsigned long offset, chunk_idx;
struct page *pageptr;
+ mutex_lock(&rp->fetch_lock);
offset = vmf->pgoff << PAGE_SHIFT;
- if (offset >= rp->b_size)
+ if (offset >= rp->b_size) {
+ mutex_unlock(&rp->fetch_lock);
return VM_FAULT_SIGBUS;
+ }
chunk_idx = offset / CHUNK_SIZE;
pageptr = rp->b_vec[chunk_idx].pg;
get_page(pageptr);
+ mutex_unlock(&rp->fetch_lock);
vmf->page = pageptr;
return 0;
}