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nvme: protect against simultaneous shutdown invocations 

Signed-off-by: Keith Busch <keith.busch@intel.com>
[hch: split from a larger patch]
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Keith Busch 2015-11-26 12:21:29 +01:00 committed by Jens Axboe
parent 7385014c07
commit 77bf25ea70
1 changed files with 5 additions and 0 deletions
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5
drivers/nvme/host/pci.c
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@ -31,6 +31,7 @@
#include <linux/mm.h>
#include <linux/module.h>
#include <linux/moduleparam.h>
#include <linux/mutex.h>
#include <linux/pci.h>
#include <linux/poison.h>
#include <linux/ptrace.h>
@ -113,6 +114,7 @@ struct nvme_dev {
struct work_struct reset_work;
struct work_struct probe_work;
struct work_struct scan_work;
struct mutex shutdown_lock;
bool subsystem;
void __iomem *cmb;
dma_addr_t cmb_dma_addr;
@ -2073,6 +2075,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
nvme_dev_list_remove(dev);
mutex_lock(&dev->shutdown_lock);
if (dev->bar) {
nvme_freeze_queues(dev);
csts = readl(dev->bar + NVME_REG_CSTS);
@ -2091,6 +2094,7 @@ static void nvme_dev_shutdown(struct nvme_dev *dev)
for (i = dev->queue_count - 1; i >= 0; i--)
nvme_clear_queue(dev->queues[i]);
mutex_unlock(&dev->shutdown_lock);
}
static int nvme_setup_prp_pools(struct nvme_dev *dev)
@ -2333,6 +2337,7 @@ static int nvme_probe(struct pci_dev *pdev, const struct pci_device_id *id)
INIT_WORK(&dev->scan_work, nvme_dev_scan);
INIT_WORK(&dev->probe_work, nvme_probe_work);
INIT_WORK(&dev->reset_work, nvme_reset_work);
mutex_init(&dev->shutdown_lock);
result = nvme_setup_prp_pools(dev);
if (result)