From: Keith Busch Date: Fri, 8 Apr 2016 22:11:02 +0000 (-0600) Subject: NVMe: Fix reset/remove race X-Git-Tag: v4.6-rc4~8^2~2 X-Git-Url: https://git.karo-electronics.de/?a=commitdiff_plain;h=9bf2b972afeaffd173fe2ce211ebc555ea7e8a87;p=karo-tx-linux.git NVMe: Fix reset/remove race This fixes a scenario where device is present and being reset, but a request to unbind the driver occurs. A previous patch series addressing a device failure removal scenario flushed reset_work after controller disable to unblock reset_work waiting on a completion that wouldn't occur. This isn't safe as-is. The broken scenario can potentially be induced with: modprobe nvme && modprobe -r nvme To fix, the reset work is flushed immediately after setting the controller removing flag, and any subsequent reset will not proceed with controller initialization if the flag is set. The controller status must be polled while active, so the watchdog timer is also left active until the controller is disabled to cleanup requests that may be stuck during namespace removal. [Fixes: ff23a2a15a2117245b4599c1352343c8b8fb4c43] Signed-off-by: Keith Busch Reviewed-by: Christoph Hellwig Reviewed-by: Johannes Thumshirn Reviewed-by: Sagi Grimberg Signed-off-by: Jens Axboe --- diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index 24ccda303efb..660ec84bc40f 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -1859,6 +1859,9 @@ static void nvme_reset_work(struct work_struct *work) if (dev->ctrl.ctrl_config & NVME_CC_ENABLE) nvme_dev_disable(dev, false); + if (test_bit(NVME_CTRL_REMOVING, &dev->flags)) + goto out; + set_bit(NVME_CTRL_RESETTING, &dev->flags); result = nvme_pci_enable(dev); @@ -2078,11 +2081,10 @@ static void nvme_remove(struct pci_dev *pdev) { struct nvme_dev *dev = pci_get_drvdata(pdev); - del_timer_sync(&dev->watchdog_timer); - set_bit(NVME_CTRL_REMOVING, &dev->flags); pci_set_drvdata(pdev, NULL); flush_work(&dev->async_work); + flush_work(&dev->reset_work); flush_work(&dev->scan_work); nvme_remove_namespaces(&dev->ctrl); nvme_uninit_ctrl(&dev->ctrl);