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NVMe: Detect commands that are completed twice 

Set the context value to CMD_CTX_COMPLETED, and print a message in the
sync_completion handler if we see it.

Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
This commit is contained in:
Matthew Wilcox 2011-02-06 08:49:55 -05:00
parent be7b62754e
commit b36235df01
1 changed files with 12 additions and 3 deletions
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15
drivers/block/nvme.c
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@ -169,12 +169,15 @@ enum {
#define CMD_CTX_BASE (POISON_POINTER_DELTA + sync_completion_id)
#define CMD_CTX_CANCELLED (0x2008 + CMD_CTX_BASE)
#define CMD_CTX_COMPLETED (0x2010 + CMD_CTX_BASE)
static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid)
{
unsigned long data;
unsigned offset = cmdid + BITS_TO_LONGS(nvmeq->q_depth);
data = nvmeq->cmdid_data[cmdid + BITS_TO_LONGS(nvmeq->q_depth)];
data = nvmeq->cmdid_data[offset];
nvmeq->cmdid_data[offset] = CMD_CTX_COMPLETED;
clear_bit(cmdid, nvmeq->cmdid_data);
wake_up(&nvmeq->sq_full);
return data;
@ -182,8 +185,8 @@ static unsigned long free_cmdid(struct nvme_queue *nvmeq, int cmdid)
static void cancel_cmdid_data(struct nvme_queue *nvmeq, int cmdid)
{
nvmeq->cmdid_data[cmdid + BITS_TO_LONGS(nvmeq->q_depth)] =
CMD_CTX_CANCELLED;
unsigned offset = cmdid + BITS_TO_LONGS(nvmeq->q_depth);
nvmeq->cmdid_data[offset] = CMD_CTX_CANCELLED;
}
static struct nvme_queue *get_nvmeq(struct nvme_ns *ns)
@ -402,6 +405,12 @@ static void sync_completion(struct nvme_queue *nvmeq, void *ctx,
struct sync_cmd_info *cmdinfo = ctx;
if ((unsigned long)cmdinfo == CMD_CTX_CANCELLED)
return;
if (unlikely((unsigned long)cmdinfo == CMD_CTX_COMPLETED)) {
dev_warn(nvmeq->q_dmadev,
"completed id %d twice on queue %d\n",
cqe->command_id, le16_to_cpup(&cqe->sq_id));
return;
}
cmdinfo->result = le32_to_cpup(&cqe->result);
cmdinfo->status = le16_to_cpup(&cqe->status) >> 1;
wake_up_process(cmdinfo->task);