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authorKeith Busch <keith.busch@intel.com>2014-03-04 03:39:13 +0400
committerMatthew Wilcox <matthew.r.wilcox@intel.com>2014-03-24 16:54:40 +0400
commit4f5099af4f3d5f999d8ab7784472d93e810e3912 (patch)
treef0dc2bc897e723037ae63a5f7f41bb3bff710399 /include/linux/nvme.h
parent5a92e700af2e5e0e6404988d6a7f2ed3dad3f46f (diff)
downloadlinux-4f5099af4f3d5f999d8ab7784472d93e810e3912.tar.xz
NVMe: IOCTL path RCU protect queue access
This adds rcu protected access to a queue in the nvme IOCTL path to fix potential races between a surprise removal and queue usage in nvme_submit_sync_cmd. The fix holds the rcu_read_lock() here to prevent the nvme_queue from freeing while this path is executing so it can't sleep, and so this path will no longer wait for a available command id should they all be in use at the time a passthrough IOCTL request is received. Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
Diffstat (limited to 'include/linux/nvme.h')
-rw-r--r--include/linux/nvme.h5
1 files changed, 1 insertions, 4 deletions
diff --git a/include/linux/nvme.h b/include/linux/nvme.h
index 98d367b06f9c..7c3f85bc10f1 100644
--- a/include/linux/nvme.h
+++ b/include/linux/nvme.h
@@ -151,10 +151,7 @@ struct nvme_iod *nvme_map_user_pages(struct nvme_dev *dev, int write,
unsigned long addr, unsigned length);
void nvme_unmap_user_pages(struct nvme_dev *dev, int write,
struct nvme_iod *iod);
-struct nvme_queue *get_nvmeq(struct nvme_dev *dev);
-void put_nvmeq(struct nvme_queue *nvmeq);
-int nvme_submit_sync_cmd(struct nvme_queue *nvmeq, struct nvme_command *cmd,
- u32 *result, unsigned timeout);
+int nvme_submit_io_cmd(struct nvme_dev *, struct nvme_command *, u32 *);
int nvme_submit_flush_data(struct nvme_queue *nvmeq, struct nvme_ns *ns);
int nvme_submit_admin_cmd(struct nvme_dev *, struct nvme_command *,
u32 *result);