From a229dbf61e03b70d98f5ed46f476d6369870a6ab Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Mon, 6 Jun 2016 23:20:48 +0200 Subject: [PATCH] nvme: allow for size limitations from transport drivers Some transport drivers may have a lower transfer size than the controller. So allow the transport to set it in the controller max_hw_sectors. Reviewed-by: Sagi Grimberg Signed-off-by: Christoph Hellwig Reviewed-by: Keith Busch Signed-off-by: Jens Axboe --- drivers/nvme/host/core.c | 7 +++++-- 1 file changed, 5 insertions(+), 2 deletions(-) diff --git a/drivers/nvme/host/core.c b/drivers/nvme/host/core.c index 684062a9d392..7ded308fd67b 100644 --- a/drivers/nvme/host/core.c +++ b/drivers/nvme/host/core.c @@ -1105,6 +1105,7 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) struct nvme_id_ctrl *id; u64 cap; int ret, page_shift; + u32 max_hw_sectors; ret = ctrl->ops->reg_read32(ctrl, NVME_REG_VS, &ctrl->vs); if (ret) { @@ -1137,9 +1138,11 @@ int nvme_init_identify(struct nvme_ctrl *ctrl) memcpy(ctrl->model, id->mn, sizeof(id->mn)); memcpy(ctrl->firmware_rev, id->fr, sizeof(id->fr)); if (id->mdts) - ctrl->max_hw_sectors = 1 << (id->mdts + page_shift - 9); + max_hw_sectors = 1 << (id->mdts + page_shift - 9); else - ctrl->max_hw_sectors = UINT_MAX; + max_hw_sectors = UINT_MAX; + ctrl->max_hw_sectors = + min_not_zero(ctrl->max_hw_sectors, max_hw_sectors); if ((ctrl->quirks & NVME_QUIRK_STRIPE_SIZE) && id->vs[3]) { unsigned int max_hw_sectors; -- 2.11.0