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libnvdimm, pmem: move request_queue allocation earlier in probe
Before the dynamically allocated struct pages from devm_memremap_pages() can be put to use outside the driver, we need a mechanism to track whether they are still in use at teardown. Towards that goal reorder the initialization sequence to allow the 'q_usage_counter' from the request_queue to be used by the devm_memremap_pages() implementation (in subsequent patches). Signed-off-by: Dan Williams <dan.j.williams@intel.com> Cc: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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@ -159,6 +159,7 @@ static struct pmem_device *pmem_alloc(struct device *dev,
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struct resource *res, int id)
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{
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struct pmem_device *pmem;
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struct request_queue *q;
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pmem = devm_kzalloc(dev, sizeof(*pmem), GFP_KERNEL);
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if (!pmem)
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@ -176,6 +177,10 @@ static struct pmem_device *pmem_alloc(struct device *dev,
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return ERR_PTR(-EBUSY);
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}
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q = blk_alloc_queue_node(GFP_KERNEL, dev_to_node(dev));
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if (!q)
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return ERR_PTR(-ENOMEM);
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pmem->pfn_flags = PFN_DEV;
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if (pmem_should_map_pages(dev)) {
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pmem->virt_addr = (void __pmem *) devm_memremap_pages(dev, res,
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@ -186,9 +191,12 @@ static struct pmem_device *pmem_alloc(struct device *dev,
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pmem->phys_addr, pmem->size,
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ARCH_MEMREMAP_PMEM);
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if (IS_ERR(pmem->virt_addr))
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if (IS_ERR(pmem->virt_addr)) {
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blk_cleanup_queue(q);
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return (void __force *) pmem->virt_addr;
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}
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pmem->pmem_queue = q;
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return pmem;
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}
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@ -208,10 +216,6 @@ static int pmem_attach_disk(struct device *dev,
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int nid = dev_to_node(dev);
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struct gendisk *disk;
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pmem->pmem_queue = blk_alloc_queue_node(GFP_KERNEL, nid);
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if (!pmem->pmem_queue)
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return -ENOMEM;
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blk_queue_make_request(pmem->pmem_queue, pmem_make_request);
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blk_queue_physical_block_size(pmem->pmem_queue, PAGE_SIZE);
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blk_queue_max_hw_sectors(pmem->pmem_queue, UINT_MAX);
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@ -446,19 +450,22 @@ static int nd_pmem_probe(struct device *dev)
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return -ENOMEM;
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nvdimm_namespace_add_poison(ndns, &pmem->bb, 0);
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if (is_nd_btt(dev))
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if (is_nd_btt(dev)) {
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/* btt allocates its own request_queue */
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blk_cleanup_queue(pmem->pmem_queue);
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pmem->pmem_queue = NULL;
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return nvdimm_namespace_attach_btt(ndns);
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}
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if (is_nd_pfn(dev))
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return nvdimm_namespace_attach_pfn(ndns);
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if (nd_btt_probe(ndns, pmem) == 0) {
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/* we'll come back as btt-pmem */
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return -ENXIO;
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}
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if (nd_pfn_probe(ndns, pmem) == 0) {
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/* we'll come back as pfn-pmem */
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if (nd_btt_probe(ndns, pmem) == 0 || nd_pfn_probe(ndns, pmem) == 0) {
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/*
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* We'll come back as either btt-pmem, or pfn-pmem, so
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* drop the queue allocation for now.
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*/
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blk_cleanup_queue(pmem->pmem_queue);
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return -ENXIO;
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}
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