io_uring/kbuf: get rid of bl->is_ready
commit 3b80cff5a4
upstream.
Now that xarray is being exclusively used for the buffer_list lookup,
this check is no longer needed. Get rid of it and the is_ready member.
Cc: stable@vger.kernel.org # v6.4+
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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parent
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@ -61,7 +61,6 @@ static int io_buffer_add_list(struct io_ring_ctx *ctx,
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* always under the ->uring_lock, but the RCU lookup from mmap does.
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*/
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bl->bgid = bgid;
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smp_store_release(&bl->is_ready, 1);
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return xa_err(xa_store(&ctx->io_bl_xa, bgid, bl, GFP_KERNEL));
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}
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@ -730,13 +729,6 @@ void *io_pbuf_get_address(struct io_ring_ctx *ctx, unsigned long bgid)
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if (!bl || !bl->is_mmap)
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return NULL;
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/*
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* Ensure the list is fully setup. Only strictly needed for RCU lookup
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* via mmap, and in that case only for the array indexed groups. For
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* the xarray lookups, it's either visible and ready, or not at all.
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*/
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if (!smp_load_acquire(&bl->is_ready))
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return NULL;
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return bl->buf_ring;
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}
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@ -29,8 +29,6 @@ struct io_buffer_list {
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__u8 is_mapped;
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/* ring mapped provided buffers, but mmap'ed by application */
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__u8 is_mmap;
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/* bl is visible from an RCU point of view for lookup */
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__u8 is_ready;
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};
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struct io_buffer {
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