6.6-stable review patch. If anyone has any objections, please let me know.
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From: Jens Axboe axboe@kernel.dk
Commit ae6a888a4357131c01d85f4c91fb32552dd0bf70 upstream.
A previous commit improved how !FMODE_NOWAIT is dealt with, but inadvertently negated a check whilst doing so. This caused -EAGAIN to be returned from reading files with O_NONBLOCK set. Fix up the check for REQ_F_SUPPORT_NOWAIT.
Reported-by: Julian Orth ju.orth@gmail.com Link: https://github.com/axboe/liburing/issues/1270 Fixes: f7c913438533 ("io_uring/rw: allow pollable non-blocking attempts for !FMODE_NOWAIT") Signed-off-by: Jens Axboe axboe@kernel.dk Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- io_uring/rw.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/io_uring/rw.c +++ b/io_uring/rw.c @@ -696,7 +696,7 @@ static int io_rw_init_file(struct io_kio * reliably. If not, or it IOCB_NOWAIT is set, don't retry. */ if (kiocb->ki_flags & IOCB_NOWAIT || - ((file->f_flags & O_NONBLOCK && (req->flags & REQ_F_SUPPORT_NOWAIT)))) + ((file->f_flags & O_NONBLOCK && !(req->flags & REQ_F_SUPPORT_NOWAIT)))) req->flags |= REQ_F_NOWAIT;
if (ctx->flags & IORING_SETUP_IOPOLL) {