diff options
Diffstat (limited to 'sys/fs/procfs/procfs_mem.c')
| -rw-r--r-- | sys/fs/procfs/procfs_mem.c | 11 |
1 files changed, 3 insertions, 8 deletions
diff --git a/sys/fs/procfs/procfs_mem.c b/sys/fs/procfs/procfs_mem.c index b8c60d6..e109146 100644 --- a/sys/fs/procfs/procfs_mem.c +++ b/sys/fs/procfs/procfs_mem.c @@ -83,6 +83,8 @@ procfs_rwmem(curp, p, uio) vm_prot_t reqprot; vm_offset_t kva; + GIANT_REQUIRED; + /* * if the vmspace is in the midst of being deallocated or the * process is exiting, don't try to grab anything. The page table @@ -91,12 +93,8 @@ procfs_rwmem(curp, p, uio) vm = p->p_vmspace; if ((p->p_flag & P_WEXIT)) return EFAULT; - - mtx_lock(&vm_mtx); - if (vm->vm_refcnt < 1) { - mtx_unlock(&vm_mtx); + if (vm->vm_refcnt < 1) return EFAULT; - } ++vm->vm_refcnt; /* * The map we want... @@ -214,9 +212,7 @@ procfs_rwmem(curp, p, uio) /* * Now do the i/o move. */ - mtx_unlock(&vm_mtx); error = uiomove((caddr_t)(kva + page_offset), len, uio); - mtx_lock(&vm_mtx); pmap_kremove(kva); @@ -235,7 +231,6 @@ procfs_rwmem(curp, p, uio) kmem_free(kernel_map, kva, PAGE_SIZE); vmspace_free(vm); - mtx_unlock(&vm_mtx); return (error); } |
