5.15-stable review patch. If anyone has any objections, please let me know.
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From: Icenowy Zheng uwu@icenowy.me
[ 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 --- drivers/nvme/host/pci.c | 1 + 1 file changed, 1 insertion(+)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 2eb692876f695..39df3ac10a21f 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1870,6 +1870,7 @@ 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; }