lkml.org 
[lkml]   [2018]   [Feb]   [11]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 9/9] nvme-pci: discard wait timeout when delete cq/sq
Date
Currently, nvme_disable_io_queues could be wakeup by both request
completion and wait timeout path. This is unnecessary and could
introduce race between nvme_dev_disable and request timeout path.
When delete cq/sq command expires, the nvme_disable_io_queues will
also be wakeup and return to nvme_dev_disable, then handle the
outstanding requests. This will race with the request timeout path.

To fix it, just use wait_for_completion instead of the timeout one.
The request timeout path will wakeup it.

Signed-off-by: Jianchao Wang <jianchao.w.wang@oracle.com>
---
drivers/nvme/host/pci.c | 6 +-----
1 file changed, 1 insertion(+), 5 deletions(-)

diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c
index a0ff18e..28f077b 100644
--- a/drivers/nvme/host/pci.c
+++ b/drivers/nvme/host/pci.c
@@ -2058,7 +2058,6 @@ static int nvme_delete_queue(struct nvme_queue *nvmeq, u8 opcode)
static void nvme_disable_io_queues(struct nvme_dev *dev)
{
int pass, queues = dev->online_queues - 1;
- unsigned long timeout;
u8 opcode = nvme_admin_delete_sq;

for (pass = 0; pass < 2; pass++) {
@@ -2066,15 +2065,12 @@ static void nvme_disable_io_queues(struct nvme_dev *dev)

reinit_completion(&dev->ioq_wait);
retry:
- timeout = ADMIN_TIMEOUT;
for (; i > 0; i--, sent++)
if (nvme_delete_queue(&dev->queues[i], opcode))
break;

while (sent--) {
- timeout = wait_for_completion_io_timeout(&dev->ioq_wait, timeout);
- if (timeout == 0)
- return;
+ wait_for_completion(&dev->ioq_wait);
if (i)
goto retry;
}
--
2.7.4
\
 
 \ /
  Last update: 2018-02-11 10:42    [W:0.166 / U:0.024 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site