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NVMe: Only clear the enable bit when disabling controller

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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>
This commit is contained in:
Matthew Wilcox 2013-05-04 06:43:17 -04:00
parent ba47e3865e
commit 44af146a84
1 changed files with 4 additions and 1 deletions
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5
drivers/block/nvme-core.c
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@ -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);
}