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| author | Alex Williamson <alex.williamson@redhat.com> | 2021-12-01 16:45:41 -0700 |
|---|---|---|
| committer | Alex Williamson <alex.williamson@redhat.com> | 2021-12-21 12:30:31 -0700 |
| commit | 21ab799585762e097387da82a4e0fd6c2ffb4000 (patch) | |
| tree | 7ef936e2892b09e2d55d8e7a35ad863e6ed7b67f | |
| parent | a7904a538933c525096ca2ccde1e60d0ee62c08e (diff) | |
| download | linux-21ab799585762e097387da82a4e0fd6c2ffb4000.tar.bz2 | |
vfio/pci: Resolve sparse endian warnings in IGD support
Sparse warns:
sparse warnings: (new ones prefixed by >>)
>> drivers/vfio/pci/vfio_pci_igd.c:146:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned short [addressable] [usertype] val @@ got restricted __le16 [usertype] @@
drivers/vfio/pci/vfio_pci_igd.c:146:21: sparse: expected unsigned short [addressable] [usertype] val
drivers/vfio/pci/vfio_pci_igd.c:146:21: sparse: got restricted __le16 [usertype]
>> drivers/vfio/pci/vfio_pci_igd.c:161:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned int [addressable] [usertype] val @@ got restricted __le32 [usertype] @@
drivers/vfio/pci/vfio_pci_igd.c:161:21: sparse: expected unsigned int [addressable] [usertype] val
drivers/vfio/pci/vfio_pci_igd.c:161:21: sparse: got restricted __le32 [usertype]
drivers/vfio/pci/vfio_pci_igd.c:176:21: sparse: sparse: incorrect type in assignment (different base types) @@ expected unsigned short [addressable] [usertype] val @@ got restricted __le16 [usertype] @@
drivers/vfio/pci/vfio_pci_igd.c:176:21: sparse: expected unsigned short [addressable] [usertype] val
drivers/vfio/pci/vfio_pci_igd.c:176:21: sparse: got restricted __le16 [usertype]
These are due to trying to use an unsigned to store the result of
a cpu_to_leXX() conversion. These are small variables, so pointer
tricks are wasteful and casting just generates different sparse
warnings. Store to and copy results from a separate little endian
variable.
Reported-by: kernel test robot <lkp@intel.com>
Link: https://lore.kernel.org/r/202111290026.O3vehj03-lkp@intel.com/
Link: https://lore.kernel.org/r/163840226123.138003.7668320168896210328.stgit@omen
Signed-off-by: Alex Williamson <alex.williamson@redhat.com>
| -rw-r--r-- | drivers/vfio/pci/vfio_pci_igd.c | 15 |
1 files changed, 9 insertions, 6 deletions
diff --git a/drivers/vfio/pci/vfio_pci_igd.c b/drivers/vfio/pci/vfio_pci_igd.c index 362f91ec8845..352c725ccf18 100644 --- a/drivers/vfio/pci/vfio_pci_igd.c +++ b/drivers/vfio/pci/vfio_pci_igd.c @@ -309,13 +309,14 @@ static ssize_t vfio_pci_igd_cfg_rw(struct vfio_pci_core_device *vdev, if ((pos & 3) && size > 2) { u16 val; + __le16 lval; ret = pci_user_read_config_word(pdev, pos, &val); if (ret) return ret; - val = cpu_to_le16(val); - if (copy_to_user(buf + count - size, &val, 2)) + lval = cpu_to_le16(val); + if (copy_to_user(buf + count - size, &lval, 2)) return -EFAULT; pos += 2; @@ -324,13 +325,14 @@ static ssize_t vfio_pci_igd_cfg_rw(struct vfio_pci_core_device *vdev, while (size > 3) { u32 val; + __le32 lval; ret = pci_user_read_config_dword(pdev, pos, &val); if (ret) return ret; - val = cpu_to_le32(val); - if (copy_to_user(buf + count - size, &val, 4)) + lval = cpu_to_le32(val); + if (copy_to_user(buf + count - size, &lval, 4)) return -EFAULT; pos += 4; @@ -339,13 +341,14 @@ static ssize_t vfio_pci_igd_cfg_rw(struct vfio_pci_core_device *vdev, while (size >= 2) { u16 val; + __le16 lval; ret = pci_user_read_config_word(pdev, pos, &val); if (ret) return ret; - val = cpu_to_le16(val); - if (copy_to_user(buf + count - size, &val, 2)) + lval = cpu_to_le16(val); + if (copy_to_user(buf + count - size, &lval, 2)) return -EFAULT; pos += 2; |