diff options
| author | Keith Busch <keith.busch@intel.com> | 2018-01-17 22:04:37 +0100 |
|---|---|---|
| committer | Jens Axboe <axboe@kernel.dk> | 2018-01-17 14:05:33 -0700 |
| commit | 20469a37aed12a886d0deda5a07c04037923144a (patch) | |
| tree | 4814f6a59399241d301081c4398d623ea42271fb /drivers/nvme | |
| parent | 32835a074171e7b83c1cefbbf9d681bb9518bbd5 (diff) | |
nvme-pci: check segement valid for SGL use
The driver needs to verify there is a payload with a command before
seeing if it should use SGLs to map it.
Fixes: 955b1b5a00ba ("nvme-pci: move use_sgl initialization to nvme_init_iod()")
Reported-by: Paul Menzel <pmenzel+linux-nvme@molgen.mpg.de>
Reviewed-by: Paul Menzel <pmenzel+linux-nvme@molgen.mpg.de>
Signed-off-by: Keith Busch <keith.busch@intel.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'drivers/nvme')
| -rw-r--r-- | drivers/nvme/host/pci.c | 7 |
1 files changed, 5 insertions, 2 deletions
diff --git a/drivers/nvme/host/pci.c b/drivers/nvme/host/pci.c index d53550e612bc..a7e94cc3c70e 100644 --- a/drivers/nvme/host/pci.c +++ b/drivers/nvme/host/pci.c @@ -451,10 +451,13 @@ static void **nvme_pci_iod_list(struct request *req) static inline bool nvme_pci_use_sgls(struct nvme_dev *dev, struct request *req) { struct nvme_iod *iod = blk_mq_rq_to_pdu(req); + int nseg = blk_rq_nr_phys_segments(req); unsigned int avg_seg_size; - avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), - blk_rq_nr_phys_segments(req)); + if (nseg == 0) + return false; + + avg_seg_size = DIV_ROUND_UP(blk_rq_payload_bytes(req), nseg); if (!(dev->ctrl.sgls & ((1 << 0) | (1 << 1)))) return false; |