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authorKeith Busch <keith.busch@intel.com>2014-03-24 10:03:56 -0400
committerMatthew Wilcox <matthew.r.wilcox@intel.com>2014-03-24 10:03:56 -0400
commitddcb776286c091189a7b928188112470ec7e9efc (patch)
tree077548a5b838e231dc10783079ccf2360b072a04
parent4f5099af4f3d5f999d8ab7784472d93e810e3912 (diff)
NVMe: Fix divide-by-zero in nvme_trans_io_get_num_cmds
dev->max_hw_sectors may be zero to indicate the device has no limit on the number of sectors. nvme_trans_do_nvme_io() should use the software limit, since this is guaranteed to be non-zero. Reported-by: Mundu <mundu2510@gmail.com> Signed-off-by: Keith Busch <keith.busch@intel.com> Signed-off-by: Matthew Wilcox <matthew.r.wilcox@intel.com>
-rw-r--r--drivers/block/nvme-scsi.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/block/nvme-scsi.c b/drivers/block/nvme-scsi.c
index e157e85bb5d7..111c920c1574 100644
--- a/drivers/block/nvme-scsi.c
+++ b/drivers/block/nvme-scsi.c
@@ -2044,7 +2044,7 @@ static int nvme_trans_do_nvme_io(struct nvme_ns *ns, struct sg_io_hdr *hdr,
struct nvme_command c;
u8 opcode = (is_write ? nvme_cmd_write : nvme_cmd_read);
u16 control;
- u32 max_blocks = nvme_block_nr(ns, dev->max_hw_sectors);
+ u32 max_blocks = queue_max_hw_sectors(ns->queue);
num_cmds = nvme_trans_io_get_num_cmds(hdr, cdb_info, max_blocks);