Number of MW LUTs depends on NTB configuration and can be set to zero, in such scenario rounddown_pow_of_two will cause undefined behaviour and should not be performed. This patch ensures that rounddown_pow_of_two is called on valid value. Signed-off-by: Maciej Grochowski <Maciej.Grochowski@xxxxxxxx> --- drivers/ntb/hw/mscc/ntb_hw_switchtec.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c index ad1786be2554..6ab094b0850a 100644 --- a/drivers/ntb/hw/mscc/ntb_hw_switchtec.c +++ b/drivers/ntb/hw/mscc/ntb_hw_switchtec.c @@ -1202,7 +1202,8 @@ static void switchtec_ntb_init_mw(struct switchtec_ntb *sndev) sndev->mmio_self_ctrl); sndev->nr_lut_mw = ioread16(&sndev->mmio_self_ctrl->lut_table_entries); - sndev->nr_lut_mw = rounddown_pow_of_two(sndev->nr_lut_mw); + if (sndev->nr_lut_mw) + sndev->nr_lut_mw = rounddown_pow_of_two(sndev->nr_lut_mw); dev_dbg(&sndev->stdev->dev, "MWs: %d direct, %d lut\n", sndev->nr_direct_mw, sndev->nr_lut_mw); @@ -1212,7 +1213,8 @@ static void switchtec_ntb_init_mw(struct switchtec_ntb *sndev) sndev->peer_nr_lut_mw = ioread16(&sndev->mmio_peer_ctrl->lut_table_entries); - sndev->peer_nr_lut_mw = rounddown_pow_of_two(sndev->peer_nr_lut_mw); + if (sndev->peer_nr_lut_mw) + sndev->peer_nr_lut_mw = rounddown_pow_of_two(sndev->peer_nr_lut_mw); dev_dbg(&sndev->stdev->dev, "Peer MWs: %d direct, %d lut\n", sndev->peer_nr_direct_mw, sndev->peer_nr_lut_mw); -- 2.20.1
