io_uring: disable ENTER_EXT_ARG_REG for IOPOLL

IOPOLL doesn't use the extended arguments, no need for it to support
IORING_ENTER_EXT_ARG_REG. Let's disable it for IOPOLL, if anything it
leaves more space for future extensions.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/a35ecd919dbdc17bd5b7932273e317832c531b45.1731689588.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>

diff --git a/io_uring/io_uring.c b/io_uring/io_uring.c
index bd71782057de2cdf9966a9c533d7e0fe9e90eaf9..464a70bde7e67c83471c2b343300bec8891ec8d2 100644 (file)
--- a/io_uring/io_uring.c
+++ b/io_uring/io_uring.c
@@ -3214,12 +3214,8 @@ static int io_validate_ext_arg(struct io_ring_ctx *ctx, unsigned flags,
 
        if (!(flags & IORING_ENTER_EXT_ARG))
                return 0;
-
-       if (flags & IORING_ENTER_EXT_ARG_REG) {
-               if (argsz != sizeof(struct io_uring_reg_wait))
-                       return -EINVAL;
-               return PTR_ERR(io_get_ext_arg_reg(ctx, argp));
-       }
+       if (flags & IORING_ENTER_EXT_ARG_REG)
+               return -EINVAL;
        if (argsz != sizeof(arg))
                return -EINVAL;
        if (copy_from_user(&arg, argp, sizeof(arg)))