NVMe: Only clear the enable bit when disabling controller

Many of the bits in the Controller Configuration register may only be
modified when the Enable bit is clear.  Clearing them at the same time
as the Enable bit might be OK, but let's play it safe and only touch the
Enable bit.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>

1 files changed, 4 insertions, 1 deletions

diff --git a/drivers/block/nvme-core.c b/drivers/block/nvme-core.c
index 2b1b5a74dc72..310d573b9e8d 100644
--- a/drivers/block/nvme-core.c
+++ b/drivers/block/nvme-core.c
@@ -1137,7 +1137,10 @@ static int nvme_wait_ready(struct nvme_dev *dev, u64 cap, bool enabled)
  */
 static int nvme_disable_ctrl(struct nvme_dev *dev, u64 cap)
 {
-        writel(0, &dev->bar->cc);
+        u32 cc = readl(&dev->bar->cc);
+
+        if (cc & NVME_CC_ENABLE)
+                writel(cc & ~NVME_CC_ENABLE, &dev->bar->cc);
         return nvme_wait_ready(dev, cap, false);
 }