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NVMe: Fix divide-by-zero in nvme_trans_io_get_num_cmds

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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>
This commit is contained in:
Keith Busch 2014-03-24 10:03:56 -04:00 committed by Matthew Wilcox
parent 4f5099af4f
commit ddcb776286
1 changed files with 1 additions and 1 deletions
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drivers/block/nvme-scsi.c
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@ -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);