[U-Boot-Users] [PATCH] PCI_READ_VIA_DWORD_OP: initialize val parameter on fail

[Shinya Kuribayashi <shinya.kuribayashi@necel.com>]

Wolfgang,

> I have to admit that I don't get wht you need all this "error_code"
> trickery instead of simpley writing
> 
> 	*val = -1;
> 
> 
> Can you please change your patch like that, and while you are at it
> please fix the other uses of this ugly construct as well?

I simply tried to remove error_code trickery for the remaining part,
but failed to compile. *val = -1; is not allowed for config write.
If we want to remove error_code completely, pci_##rw##_config_##size()
should be revised first.

I have a feeling the current macro may be compact tough, let's see
the patch. Of course compiled and tested.

Thanks.

---

This patch contains the following cleanups for PCI_OP macro:
- Split PCI_OP into PCI_READ_OP and PCI_WRITE_OP, respectivly
- Fix bad brace style
- Initialize *val with -1 on error. This obsoletes error_code trick

Signed-off-by: Shinya Kuribayashi <shinya.kuribayashi@necel.com>

---

 drivers/pci.c |   34 ++++++++++++++++++++++------------
 1 file changed, 22 insertions(+), 12 deletions(-)

Index: b/drivers/pci.c
===================================================================
--- a/drivers/pci.c
+++ b/drivers/pci.c
@@ -53,26 +53,36 @@ PCI_HOSE_OP(write, word, u16)
 PCI_HOSE_OP(write, dword, u32)
 
 #ifndef CONFIG_IXP425
-#define PCI_OP(rw, size, type, error_code)				\
-int pci_##rw##_config_##size(pci_dev_t dev, int offset, type value)	\
+#define PCI_READ_OP(size, type)						\
+int pci_read_config_##size(pci_dev_t dev, int offset, type value)	\
 {									\
 	struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));	\
 									\
-	if (!hose)							\
-	{								\
-		error_code;						\
+	if (!hose) {							\
+		*value = -1;						\
 		return -1;						\
 	}								\
 									\
-	return pci_hose_##rw##_config_##size(hose, dev, offset, value);	\
+	return pci_hose_read_config_##size(hose, dev, offset, value);	\
+}
+
+#define PCI_WRITE_OP(size, type)					\
+int pci_write_config_##size(pci_dev_t dev, int offset, type value)	\
+{									\
+	struct pci_controller *hose = pci_bus_to_hose(PCI_BUS(dev));	\
+									\
+	if (!hose)							\
+		return -1;						\
+									\
+	return pci_hose_write_config_##size(hose, dev, offset, value);	\
 }
 
-PCI_OP(read, byte, u8 *, *value = 0xff)
-PCI_OP(read, word, u16 *, *value = 0xffff)
-PCI_OP(read, dword, u32 *, *value = 0xffffffff)
-PCI_OP(write, byte, u8, )
-PCI_OP(write, word, u16, )
-PCI_OP(write, dword, u32, )
+PCI_READ_OP(byte, u8 *)
+PCI_READ_OP(word, u16 *)
+PCI_READ_OP(dword, u32 *)
+PCI_WRITE_OP(byte, u8)
+PCI_WRITE_OP(word, u16)
+PCI_WRITE_OP(dword, u32)
 #endif	/* CONFIG_IXP425 */
 
 #define PCI_READ_VIA_DWORD_OP(size, type, off_mask)			\