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io_uring: make reg buf init consistent

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The default (i.e. empty) state of register buffer is dummy_ubuf, so set
it to dummy on init instead of NULL.

Signed-off-by: Pavel Begunkov <asml.silence@gmail.com>
Link: https://lore.kernel.org/r/c5456aecf03d9627fbd6e65e100e2b5293a6151e.1655310733.git.asml.silence@gmail.com
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Pavel Begunkov 2022-06-15 17:33:47 +01:00 committed by Jens Axboe
parent 61a2732af4
commit 5ff4fdffad
1 changed files with 3 additions and 6 deletions
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9
io_uring/rsrc.c
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@ -567,7 +567,7 @@ static int __io_sqe_buffers_update(struct io_ring_ctx *ctx,
io_buffer_unmap(ctx, &imu);
break;
}
ctx->user_bufs[i] = NULL;
ctx->user_bufs[i] = ctx->dummy_ubuf;
needs_switch = true;
}
@ -1203,14 +1203,11 @@ static int io_sqe_buffer_register(struct io_ring_ctx *ctx, struct iovec *iov,
size_t size;
int ret, nr_pages, i;
if (!iov->iov_base) {
*pimu = ctx->dummy_ubuf;
*pimu = ctx->dummy_ubuf;
if (!iov->iov_base)
return 0;
}
*pimu = NULL;
ret = -ENOMEM;
pages = io_pin_pages((unsigned long) iov->iov_base, iov->iov_len,
&nr_pages);
if (IS_ERR(pages)) {