diff options
| -rw-r--r-- | arch/um/os-Linux/sigio.c | 9 |
1 files changed, 8 insertions, 1 deletions
diff --git a/arch/um/os-Linux/sigio.c b/arch/um/os-Linux/sigio.c index 0d2422a7d72..d22623e8fce 100644 --- a/arch/um/os-Linux/sigio.c +++ b/arch/um/os-Linux/sigio.c @@ -191,6 +191,13 @@ int ignore_sigio_fd(int fd) struct pollfd *p; int err = 0, i, n = 0; + /* This is called from exitcalls elsewhere in UML - if + * sigio_cleanup has already run, then update_thread will hang + * or fail because the thread is no longer running. + */ + if(write_sigio_pid == -1) + return -EIO; + sigio_lock(); for(i = 0; i < current_poll.used; i++){ if(current_poll.poll[i].fd == fd) break; @@ -215,7 +222,7 @@ int ignore_sigio_fd(int fd) update_thread(); out: sigio_unlock(); - return(err); + return err; } static struct pollfd *setup_initial_poll(int fd) |