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nvme-pci: clean up CMBMSC when registering CMB fails

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[ Upstream commit 6a3572e10f740acd48e2713ef37e92186a3ce5e8 ]

CMB decoding should get disabled when the CMB block isn't successfully
registered to P2P DMA subsystem.

Clean up the CMBMSC register in this error handling codepath to disable
CMB decoding (and CMBLOC/CMBSZ registers).

Signed-off-by: Icenowy Zheng <uwu@icenowy.me>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Keith Busch <kbusch@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Icenowy Zheng
2025-02-13 01:04:43 +08:00
committed by Greg Kroah-Hartman
parent 6fca3c84f1
commit 159ef31d18
1 changed files with 1 additions and 0 deletions
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1
drivers/nvme/host/pci.c
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@@ -1949,6 +1949,7 @@ static void nvme_map_cmb(struct nvme_dev *dev)
if (pci_p2pdma_add_resource(pdev, bar, size, offset)) {
dev_warn(dev->ctrl.device,
"failed to register the CMB\n");
hi_lo_writeq(0, dev->bar + NVME_REG_CMBMSC);
return;
}