Revert "Fix a Python spinlock bug"

This reverts commit 2df509fc0e.

src/core/lib/iomgr/ev_poll_posix.cc

@@ -71,7 +71,6 @@ struct grpc_fd {
   int shutdown;
   int closed;
   int released;
-  gpr_atm pollhup;
   grpc_error* shutdown_error;
 
   /* The watcher list.
@@ -336,7 +335,6 @@ static grpc_fd* fd_create(int fd, const char* name) {
   r->on_done_closure = nullptr;
   r->closed = 0;
   r->released = 0;
-  gpr_atm_no_barrier_store(&r->pollhup, 0);
   r->read_notifier_pollset = nullptr;
 
   char* name2;
@@ -952,8 +950,7 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
       pfds[0].events = POLLIN;
       pfds[0].revents = 0;
       for (i = 0; i < pollset->fd_count; i++) {
-        if (fd_is_orphaned(pollset->fds[i]) ||
-            gpr_atm_no_barrier_load(&pollset->fds[i]->pollhup) == 1) {
+        if (fd_is_orphaned(pollset->fds[i])) {
           GRPC_FD_UNREF(pollset->fds[i], "multipoller");
         } else {
           pollset->fds[fd_count++] = pollset->fds[i];
@@ -1020,12 +1017,6 @@ static grpc_error* pollset_work(grpc_pollset* pollset,
                       pfds[i].fd, (pfds[i].revents & POLLIN_CHECK) != 0,
                       (pfds[i].revents & POLLOUT_CHECK) != 0, pfds[i].revents);
             }
-            /* This is a mitigation to prevent poll() from spinning on a
-             ** POLLHUP https://github.com/grpc/grpc/pull/13665
-             */
-            if (pfds[i].revents & POLLHUP) {
-              gpr_atm_no_barrier_store(&watchers[i].fd->pollhup, 1);
-            }
             fd_end_poll(&watchers[i], pfds[i].revents & POLLIN_CHECK,
                         pfds[i].revents & POLLOUT_CHECK, pollset);
           }