diff options
| author | Christoph Hellwig <hch@lst.de> | 2016-03-02 18:07:12 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@fb.com> | 2016-03-03 14:43:10 -0700 |
| commit | 45686b6198bd824f083ff5293f191d78db9d708a (patch) | |
| tree | 5c752a162d53af164942242d217d4cf54a98afd8 | |
| parent | da35825d9a091a7a1d5824c8468168e2658333ff (diff) | |
| download | linux-45686b6198bd824f083ff5293f191d78db9d708a.tar.gz | |
nvme: fix max_segments integer truncation
The block layer uses an unsigned short for max_segments. The way we
calculate the value for NVMe tends to generate very large 32-bit values,
which after integer truncation may lead to a zero value instead of
the desired outcome.
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reported-by: Jeff Lien <Jeff.Lien@hgst.com>
Tested-by: Jeff Lien <Jeff.Lien@hgst.com>
Reviewed-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Jens Axboe <axboe@fb.com>
| -rw-r--r-- | drivers/nvme/host/core.c | 6 |
1 files changed, 4 insertions, 2 deletions
diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index cfee6ac399a3ab..03c46412fff4d6 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -844,9 +844,11 @@ static void nvme_set_queue_limits(struct nvme_ctrl *ctrl, struct request_queue *q) { if (ctrl->max_hw_sectors) { + u32 max_segments = + (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1; + blk_queue_max_hw_sectors(q, ctrl->max_hw_sectors); - blk_queue_max_segments(q, - (ctrl->max_hw_sectors / (ctrl->page_size >> 9)) + 1); + blk_queue_max_segments(q, min_t(u32, max_segments, USHRT_MAX)); } if (ctrl->stripe_size) blk_queue_chunk_sectors(q, ctrl->stripe_size >> 9); |