6.12-stable review patch. If anyone has any objections, please let me know.
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From: André Draszik andre.draszik@linaro.org
commit 01aad16c2257ab8ff33b152b972c9f2e1af47912 upstream.
On Google gs101, the number of UTP transfer request slots (nutrs) is 32, and in this case the driver ends up programming the UTRL_NEXUS_TYPE incorrectly as 0.
This is because the left hand side of the shift is 1, which is of type int, i.e. 31 bits wide. Shifting by more than that width results in undefined behaviour.
Fix this by switching to the BIT() macro, which applies correct type casting as required. This ensures the correct value is written to UTRL_NEXUS_TYPE (0xffffffff on gs101), and it also fixes a UBSAN shift warning:
UBSAN: shift-out-of-bounds in drivers/ufs/host/ufs-exynos.c:1113:21 shift exponent 32 is too large for 32-bit type 'int'
For consistency, apply the same change to the nutmrs / UTMRL_NEXUS_TYPE write.
Fixes: 55f4b1f73631 ("scsi: ufs: ufs-exynos: Add UFS host support for Exynos SoCs") Cc: stable@vger.kernel.org Signed-off-by: André Draszik andre.draszik@linaro.org Link: https://lore.kernel.org/r/20250707-ufs-exynos-shift-v1-1-1418e161ae40@linaro... Reviewed-by: Bart Van Assche bvanassche@acm.org Reviewed-by: Peter Griffin peter.griffin@linaro.org Signed-off-by: Martin K. Petersen martin.petersen@oracle.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/ufs/host/ufs-exynos.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-)
--- a/drivers/ufs/host/ufs-exynos.c +++ b/drivers/ufs/host/ufs-exynos.c @@ -1078,8 +1078,8 @@ static int exynos_ufs_post_link(struct u hci_writel(ufs, val, HCI_TXPRDT_ENTRY_SIZE);
hci_writel(ufs, ilog2(DATA_UNIT_SIZE), HCI_RXPRDT_ENTRY_SIZE); - hci_writel(ufs, (1 << hba->nutrs) - 1, HCI_UTRL_NEXUS_TYPE); - hci_writel(ufs, (1 << hba->nutmrs) - 1, HCI_UTMRL_NEXUS_TYPE); + hci_writel(ufs, BIT(hba->nutrs) - 1, HCI_UTRL_NEXUS_TYPE); + hci_writel(ufs, BIT(hba->nutmrs) - 1, HCI_UTMRL_NEXUS_TYPE); hci_writel(ufs, 0xf, HCI_AXIDMA_RWDATA_BURST_LEN);
if (ufs->opts & EXYNOS_UFS_OPT_SKIP_CONNECTION_ESTAB)