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aio: clean up aio ring in the fail path 

Clean up the aio ring file in the fail path of aio_setup_ring
and ioctx_alloc. And maybe it can fix the GPF issue reported by
Dave Jones:
https://lkml.org/lkml/2013/11/25/898

Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Benjamin LaHaise <bcrl@kvack.org>
This commit is contained in:
Gu Zheng 2013-12-04 18:19:06 +08:00 committed by Benjamin LaHaise
parent ddb8c45ba1
commit d1b9432712
1 changed files with 6 additions and 2 deletions
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8
fs/aio.c
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@ -316,9 +316,11 @@ static int aio_setup_ring(struct kioctx *ctx)
if (nr_pages > AIO_RING_PAGES) { if (nr_pages > AIO_RING_PAGES) {
ctx->ring_pages = kcalloc(nr_pages, sizeof(struct page *), ctx->ring_pages = kcalloc(nr_pages, sizeof(struct page *),
GFP_KERNEL); GFP_KERNEL);
if (!ctx->ring_pages) if (!ctx->ring_pages) {
put_aio_ring_file(ctx);
return -ENOMEM; return -ENOMEM;
} }
}
ctx->mmap_size = nr_pages * PAGE_SIZE; ctx->mmap_size = nr_pages * PAGE_SIZE;
pr_debug("attempting mmap of %lu bytes\n", ctx->mmap_size); pr_debug("attempting mmap of %lu bytes\n", ctx->mmap_size);
@ -594,7 +596,7 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
aio_nr + nr_events < aio_nr) { aio_nr + nr_events < aio_nr) {
spin_unlock(&aio_nr_lock); spin_unlock(&aio_nr_lock);
err = -EAGAIN; err = -EAGAIN;
goto err; goto err_ctx;
} }
aio_nr += ctx->max_reqs; aio_nr += ctx->max_reqs;
spin_unlock(&aio_nr_lock); spin_unlock(&aio_nr_lock);
@ -611,6 +613,8 @@ static struct kioctx *ioctx_alloc(unsigned nr_events)
err_cleanup: err_cleanup:
aio_nr_sub(ctx->max_reqs); aio_nr_sub(ctx->max_reqs);
err_ctx:
aio_free_ring(ctx);
err: err:
free_percpu(ctx->cpu); free_percpu(ctx->cpu);
free_percpu(ctx->reqs.pcpu_count); free_percpu(ctx->reqs.pcpu_count);