[Intel-gfx] [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value
The return value of pci_read_config_*() may not indicate a device error. However, the value read by these functions is more likely to indicate this kind of error. This presents two overlapping ways of reporting errors and complicates error checking. It is possible to move to one single way of checking for error if the dependencies on the return value of these functions are removed, then it can later be made to return void. Remove all uses of the return value of pci_read_config_*(). Check the actual value read for ~0. In this case, ~0 is an invalid value thus it indicates some kind of error. In some cases it madkes sence to make the calling function return void without causing any bug. Future callers can use the value obtained from these functions for validation. This case pertain to cs5536_read() and edac_pci_read_dword() MERGE: There is no dependency. Merge individually Saheed O. Bolarinwa (17): ata: Drop uses of pci_read_config_*() return value atm: Drop uses of pci_read_config_*() return value bcma: Drop uses of pci_read_config_*() return value hwrng: Drop uses of pci_read_config_*() return value dmaengine: ioat: Drop uses of pci_read_config_*() return value edac: Drop uses of pci_read_config_*() return value fpga: altera-cvp: Drop uses of pci_read_config_*() return value gpio: Drop uses of pci_read_config_*() return value drm/i915/vga: Drop uses of pci_read_config_*() return value hwmon: Drop uses of pci_read_config_*() return value intel_th: pci: Drop uses of pci_read_config_*() return value i2c: Drop uses of pci_read_config_*() return value ide: Drop uses of pci_read_config_*() return value IB: Drop uses of pci_read_config_*() return value iommu/vt-d: Drop uses of pci_read_config_*() return value mtd: Drop uses of pci_read_config_*() return value net: Drop uses of pci_read_config_*() return value drivers/ata/pata_cs5536.c | 6 +-- drivers/ata/pata_rz1000.c | 3 +- drivers/atm/eni.c | 3 +- drivers/atm/he.c | 12 +++-- drivers/atm/idt77252.c| 9 ++-- drivers/atm/iphase.c | 46 ++- drivers/atm/lanai.c | 4 +- drivers/atm/nicstar.c | 3 +- drivers/atm/zatm.c| 9 ++-- drivers/bcma/host_pci.c | 6 ++- drivers/char/hw_random/amd-rng.c | 6 +-- drivers/dma/ioat/dma.c| 6 +-- drivers/edac/amd64_edac.c | 8 ++-- drivers/edac/amd8111_edac.c | 16 ++- drivers/edac/amd8131_edac.c | 6 +-- drivers/edac/i82443bxgx_edac.c| 3 +- drivers/edac/sb_edac.c| 12 +++-- drivers/edac/skx_common.c | 18 +--- drivers/fpga/altera-cvp.c | 8 ++-- drivers/gpio/gpio-amd8111.c | 7 ++- drivers/gpio/gpio-rdc321x.c | 21 + drivers/gpu/drm/i915/display/intel_vga.c | 3 +- drivers/hwmon/i5k_amb.c | 12 +++-- drivers/hwmon/vt8231.c| 8 ++-- drivers/hwtracing/intel_th/pci.c | 12 ++--- drivers/i2c/busses/i2c-ali15x3.c | 6 ++- drivers/i2c/busses/i2c-elektor.c | 3 +- drivers/i2c/busses/i2c-nforce2.c | 4 +- drivers/i2c/busses/i2c-sis5595.c | 17 --- drivers/i2c/busses/i2c-sis630.c | 7 +-- drivers/i2c/busses/i2c-viapro.c | 11 +++-- drivers/ide/cs5536.c | 6 +-- drivers/ide/rz1000.c | 3 +- drivers/ide/setup-pci.c | 26 +++ drivers/infiniband/hw/hfi1/pcie.c | 38 +++ drivers/infiniband/hw/mthca/mthca_reset.c | 19 drivers/iommu/intel/iommu.c | 6 ++- drivers/mtd/maps/ichxrom.c| 4 +- drivers/net/can/peak_canfd/peak_pciefd_main.c | 6 ++- drivers/net/can/sja1000/peak_pci.c| 6 ++- drivers/net/ethernet/agere/et131x.c | 11 +++-- .../ethernet/broadcom/bnx2x/bnx2x_ethtool.c | 5 +- .../cavium/liquidio/cn23xx_pf_device.c| 4 +- drivers/net/ethernet/marvell/sky2.c | 5 +- drivers/net/ethernet/mellanox/mlx4/catas.c| 7 +-- drivers/net/ethernet/mellanox/mlx4/reset.c| 10 ++-- .../net/ethernet/myricom/myri10ge/myri10ge.c | 4 +- drivers/net/wan/farsync.c | 5 +- .../broadcom/brcm80211/brcmfmac/pcie.c| 4 +- .../net/wireless/intel/iwlwifi/pcie/trans.c | 15 -- 50 files changed, 270 insertions(+), 209 deletions(-) -- 2.18.4 ___ Intel-gfx mailing list Intel-gfx@lists.freedesktop.org https://lists.freedesktop.org/mailman/listinfo/intel-gfx
[Intel-gfx] [RFC PATCH 09/17] drm/i915/vga: Drop uses of pci_read_config_*() return value
The return value of pci_read_config_*() may not indicate a device error.
However, the value read by these functions is more likely to indicate
this kind of error. This presents two overlapping ways of reporting
errors and complicates error checking.
It is possible to move to one single way of checking for error if the
dependency on the return value of these functions is removed, then it
can later be made to return void.
Remove all uses of the return value of pci_read_config_*().
Check the actual value read for ~0. In this case, ~0 is an invalid
value thus it indicates some kind of error.
Suggested-by: Bjorn Helgaas
Signed-off-by: Saheed O. Bolarinwa
---
drivers/gpu/drm/i915/display/intel_vga.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/gpu/drm/i915/display/intel_vga.c
b/drivers/gpu/drm/i915/display/intel_vga.c
index be333699c515..6f9406699c9d 100644
--- a/drivers/gpu/drm/i915/display/intel_vga.c
+++ b/drivers/gpu/drm/i915/display/intel_vga.c
@@ -99,7 +99,8 @@ intel_vga_set_state(struct drm_i915_private *i915, bool
enable_decode)
unsigned int reg = INTEL_GEN(i915) >= 6 ? SNB_GMCH_CTRL :
INTEL_GMCH_CTRL;
u16 gmch_ctrl;
- if (pci_read_config_word(i915->bridge_dev, reg, &gmch_ctrl)) {
+ pci_read_config_word(i915->bridge_dev, reg, &gmch_ctrl);
+ if (gmch_ctrl == (u16)~0) {
drm_err(&i915->drm, "failed to read control word\n");
return -EIO;
}
--
2.18.4
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