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SubjectRFC: pci_write_bits*() convenience functions v.2
This is a version of the pci_write_bits*() with error checking included.

I don't know if you like the #defined function generator, but at
least this avoids copy-and-paste errors in case this needs some
changes in the future.

Signed-off-by: Michał Mirosław <mirq-linux@rere.qmqm.pl>

diff --git a/drivers/edac/edac_core.h b/drivers/edac/edac_core.h
index 4b55ec6..f1f8b94 100644
--- a/drivers/edac/edac_core.h
+++ b/drivers/edac/edac_core.h
@@ -722,54 +722,6 @@ struct edac_pci_ctl_info {
#define to_edac_pci_ctl_work(w) \
container_of(w, struct edac_pci_ctl_info,work)

-/* write all or some bits in a byte-register*/
-static inline void pci_write_bits8(struct pci_dev *pdev, int offset, u8 value,
- u8 mask)
-{
- if (mask != 0xff) {
- u8 buf;
-
- pci_read_config_byte(pdev, offset, &buf);
- value &= mask;
- buf &= ~mask;
- value |= buf;
- }
-
- pci_write_config_byte(pdev, offset, value);
-}
-
-/* write all or some bits in a word-register*/
-static inline void pci_write_bits16(struct pci_dev *pdev, int offset,
- u16 value, u16 mask)
-{
- if (mask != 0xffff) {
- u16 buf;
-
- pci_read_config_word(pdev, offset, &buf);
- value &= mask;
- buf &= ~mask;
- value |= buf;
- }
-
- pci_write_config_word(pdev, offset, value);
-}
-
-/* write all or some bits in a dword-register*/
-static inline void pci_write_bits32(struct pci_dev *pdev, int offset,
- u32 value, u32 mask)
-{
- if (mask != 0xffff) {
- u32 buf;
-
- pci_read_config_dword(pdev, offset, &buf);
- value &= mask;
- buf &= ~mask;
- value |= buf;
- }
-
- pci_write_config_dword(pdev, offset, value);
-}
-
#endif /* CONFIG_PCI */

extern struct mem_ctl_info *edac_mc_alloc(unsigned sz_pvt, unsigned nr_csrows,
diff --git a/include/linux/pci.h b/include/linux/pci.h
index feb4657..f5a4112 100644
--- a/include/linux/pci.h
+++ b/include/linux/pci.h
@@ -610,6 +610,28 @@ static inline int pci_write_config_dword(struct pci_dev *dev, int where,
return pci_bus_write_config_dword(dev->bus, dev->devfn, where, val);
}

+#define GEN_PCI_UPDATE_FUNC(t,b) \
+static inline int pci_write_bits##b(struct pci_dev *dev, int where, \
+ u##b value, u##b mask) \
+{ \
+ u##b buf; \
+ int err; \
+ \
+ err = pci_read_config_##t(dev, where, &buf); \
+ if (err) \
+ return err; \
+ \
+ buf &= ~mask; \
+ buf |= value; \
+ \
+ return pci_write_config_##t(dev, where, buf); \
+}
+
+GEN_PCI_UPDATE_FUNC(byte, 8)
+GEN_PCI_UPDATE_FUNC(word, 16)
+GEN_PCI_UPDATE_FUNC(dword, 32)
+#undef GEN_PCI_UPDATE_FUNC
+
int __must_check pci_enable_device(struct pci_dev *dev);
int __must_check pci_enable_device_io(struct pci_dev *dev);
int __must_check pci_enable_device_mem(struct pci_dev *dev);
--
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