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nvme-pci: clear shadow doorbell memory on resets

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The host memory doorbell and event buffers need to be initialized on
each reset so the driver doesn't observe stale values from the previous
instantiation.

Signed-off-by: Keith Busch <kbusch@kernel.org>
Tested-by: John Levon <john.levon@nutanix.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Keith Busch 2021-10-14 09:45:42 -07:00 committed by Christoph Hellwig
parent 0974812200
commit 58847f12fe
1 changed files with 8 additions and 1 deletions
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9
drivers/nvme/host/pci.c
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@ -245,8 +245,15 @@ static int nvme_dbbuf_dma_alloc(struct nvme_dev *dev)
{
unsigned int mem_size = nvme_dbbuf_size(dev);
if (dev->dbbuf_dbs)
if (dev->dbbuf_dbs) {
/*
* Clear the dbbuf memory so the driver doesn't observe stale
* values from the previous instantiation.
*/
memset(dev->dbbuf_dbs, 0, mem_size);
memset(dev->dbbuf_eis, 0, mem_size);
return 0;
}
dev->dbbuf_dbs = dma_alloc_coherent(dev->dev, mem_size,
&dev->dbbuf_dbs_dma_addr,