in UFS, each request is designated via the triplet <iid, lun, task tag>. In UFS4.0 the Initiator ID field is 8 bits wide, comprised of the EXT_IID and IID fields. Together with the task tag (single byte), they limit the driver's hw queues capacity. Signed-off-by: Avri Altman <avri.altman@xxxxxxx> --- drivers/ufs/core/ufshcd.c | 4 ++++ 1 file changed, 4 insertions(+) diff --git a/drivers/ufs/core/ufshcd.c b/drivers/ufs/core/ufshcd.c index 35a3bd95c5e4..d529c42a682a 100644 --- a/drivers/ufs/core/ufshcd.c +++ b/drivers/ufs/core/ufshcd.c @@ -8468,6 +8468,10 @@ static int ufshcd_alloc_mcq(struct ufs_hba *hba) if (ret) goto err; + if (WARN_ONCE(hba->nutrs * hba->nr_hw_queues > (1 << 16) - 1, + "there can be at most 1<<16 inflight requests\n")) + goto err; + /* * Previously allocated memory for nutrs may not be enough in MCQ mode. * Number of supported tags in MCQ mode may be larger than SDB mode. -- 2.17.1
