[ Upstream commit 7637de311bd2124b298a072852448b940d8a34b9 ]
When running a NVMe device that is attached to a addressing challenged PCIe root port that requires bounce buffering, our request sizes can easily overflow the swiotlb bounce buffer size. Limit the maximum I/O size to the limit exposed by the DMA mapping subsystem.
Signed-off-by: Christoph Hellwig hch@lst.de Reported-by: Atish Patra Atish.Patra@wdc.com Tested-by: Atish Patra Atish.Patra@wdc.com Reviewed-by: Sagi Grimberg sagi@grimberg.me Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/nvme/host/pci.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 245b6e2151c1..7fbcd72c438f 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -2521,7 +2521,8 @@ static void nvme_reset_work(struct work_struct *work) * Limit the max command size to prevent iod->sg allocations going * over a single page. */ - dev->ctrl.max_hw_sectors = NVME_MAX_KB_SZ << 1; + dev->ctrl.max_hw_sectors = min_t(u32, + NVME_MAX_KB_SZ << 1, dma_max_mapping_size(dev->dev) >> 9); dev->ctrl.max_segments = NVME_MAX_SEGS;
/*