From: Jernej Skrabec jernej.skrabec@gmail.com
[ Upstream commit eac0104dc69be50bed86926d6f32e82b44f8c921 ]
Because driver has enum type permissions and iommu subsystem has bitmap type, we have to be careful how check for combined read and write permissions is done. In such case, we have to mask both permissions and check that both are set at the same time.
Current code just masks both flags but doesn't check that both are set. In short, it always sets R/W permission, regardles if requested permissions were RO, WO or RW. Fix that.
Fixes: 4100b8c229b3 ("iommu: Add Allwinner H6 IOMMU driver") Signed-off-by: Jernej Skrabec jernej.skrabec@gmail.com Link: https://lore.kernel.org/r/20221025165415.307591-4-jernej.skrabec@gmail.com Signed-off-by: Joerg Roedel jroedel@suse.de Signed-off-by: Sasha Levin sashal@kernel.org --- drivers/iommu/sun50i-iommu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/drivers/iommu/sun50i-iommu.c b/drivers/iommu/sun50i-iommu.c index 2512eabbf4ac..68aee56e2231 100644 --- a/drivers/iommu/sun50i-iommu.c +++ b/drivers/iommu/sun50i-iommu.c @@ -272,7 +272,7 @@ static u32 sun50i_mk_pte(phys_addr_t page, int prot) enum sun50i_iommu_aci aci; u32 flags = 0;
- if (prot & (IOMMU_READ | IOMMU_WRITE)) + if ((prot & (IOMMU_READ | IOMMU_WRITE)) == (IOMMU_READ | IOMMU_WRITE)) aci = SUN50I_IOMMU_ACI_RD_WR; else if (prot & IOMMU_READ) aci = SUN50I_IOMMU_ACI_RD;