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nvme-pci: check for NULL return from pci_alloc_p2pmem()

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Modify nvme_alloc_sq_cmds() to call pci_free_p2pmem() to free the memory
it allocated using pci_alloc_p2pmem() in case pci_p2pmem_virt_to_bus()
returns null.

Makes sure not to call pci_free_p2pmem() if pci_alloc_p2pmem() returned
NULL, which can happen if CONFIG_PCI_P2PDMA is not configured.

The current implementation is not expected to leak since
pci_p2pmem_virt_to_bus() is expected to fail only if pci_alloc_p2pmem()
returns null. However, checking the return value of pci_alloc_p2pmem()
is more explicit.

Signed-off-by: Alan Mikhak <alan.mikhak@sifive.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Alan Mikhak 2019-07-08 10:05:11 -07:00 committed by Christoph Hellwig
parent 0298d54352
commit bfac8e9f55
1 changed files with 9 additions and 5 deletions
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14
drivers/nvme/host/pci.c
View File

@ -1439,11 +1439,15 @@ static int nvme_alloc_sq_cmds(struct nvme_dev *dev, struct nvme_queue *nvmeq,
if (qid && dev->cmb_use_sqes && (dev->cmbsz & NVME_CMBSZ_SQS)) {
nvmeq->sq_cmds = pci_alloc_p2pmem(pdev, SQ_SIZE(depth));
nvmeq->sq_dma_addr = pci_p2pmem_virt_to_bus(pdev,
nvmeq->sq_cmds);
if (nvmeq->sq_dma_addr) {
set_bit(NVMEQ_SQ_CMB, &nvmeq->flags);
return 0;
if (nvmeq->sq_cmds) {
nvmeq->sq_dma_addr = pci_p2pmem_virt_to_bus(pdev,
nvmeq->sq_cmds);
if (nvmeq->sq_dma_addr) {
set_bit(NVMEQ_SQ_CMB, &nvmeq->flags);
return 0;
}
pci_free_p2pmem(pdev, nvmeq->sq_cmds, SQ_SIZE(depth));
}
}