> Why is this setting being done and undone on each IO? Wouldn't it be > more efficient to set it once during device initialization? > > And more importantly, this isn't thread safe: one CPU may be setting the > device's dma alignment mask to 0 while another CPU is expecting it to be > NVME_CTRL_PAGE_SIZE - 1.
I was having trouble getting the OS booted when setting it once during initialization. However when I rebased to the latest rc6 this morning it seems to be working with setting the mask on probe. I am still testing out and will appreciate any idea what may cause the nvme driver to fail with a single mask. -- Jianxiong Gao
