io_uring: move min_events sanitisation

iopoll and normal waiting already duplicate min_completion truncation,
so move them inside the corresponding routines.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/254adb289cc04638f25d746a7499260fa89a179e.1742829388.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

io_uring/io_uring.c

@@ -1505,11 +1505,13 @@ static __cold void io_iopoll_try_reap_events(struct io_ring_ctx *ctx)
 	mutex_unlock(&ctx->uring_lock);
 }
 
-static int io_iopoll_check(struct io_ring_ctx *ctx, long min_events)
+static int io_iopoll_check(struct io_ring_ctx *ctx, unsigned int min_events)
 {
 	unsigned int nr_events = 0;
 	unsigned long check_cq;
 
+	min_events = min(min_events, ctx->cq_entries);
+
 	lockdep_assert_held(&ctx->uring_lock);
 
 	if (!io_allowed_run_tw(ctx))
@@ -2537,6 +2539,8 @@ static int io_cqring_wait(struct io_ring_ctx *ctx, int min_events, u32 flags,
 	ktime_t start_time;
 	int ret;
 
+	min_events = min_t(int, min_events, ctx->cq_entries);
+
 	if (!io_allowed_run_tw(ctx))
 		return -EEXIST;
 	if (io_local_work_pending(ctx))
@@ -3420,22 +3424,16 @@ SYSCALL_DEFINE6(io_uring_enter, unsigned int, fd, u32, to_submit,
 			mutex_lock(&ctx->uring_lock);
 iopoll_locked:
 			ret2 = io_validate_ext_arg(ctx, flags, argp, argsz);
-			if (likely(!ret2)) {
-				min_complete = min(min_complete,
-						   ctx->cq_entries);
+			if (likely(!ret2))
 				ret2 = io_iopoll_check(ctx, min_complete);
-			}
 			mutex_unlock(&ctx->uring_lock);
 		} else {
 			struct ext_arg ext_arg = { .argsz = argsz };
 
 			ret2 = io_get_ext_arg(ctx, flags, argp, &ext_arg);
-			if (likely(!ret2)) {
-				min_complete = min(min_complete,
-						   ctx->cq_entries);
+			if (likely(!ret2))
 				ret2 = io_cqring_wait(ctx, min_complete, flags,
 						      &ext_arg);
-			}
 		}
 
 		if (!ret) {