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x86: Return -1 when reading a PCI config register fails 

This can fail for internal reasons, so return a sensible value rather than
a random one.

Signed-off-by: Simon Glass <sjg@chromium.org>
Reviewed-by: Bin Meng <bmeng.cn@gmail.com>
This commit is contained in:
Simon Glass 2015-08-12 20:09:30 -06:00
parent ecf674b772
commit 052e34b363
1 changed files with 6 additions and 3 deletions
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9
arch/x86/cpu/pci.c
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@ -76,7 +76,8 @@ unsigned int x86_pci_read_config8(pci_dev_t dev, unsigned where)
{
uint8_t value;
pci_hose_read_config_byte(get_hose(), dev, where, &value);
if (pci_hose_read_config_byte(get_hose(), dev, where, &value))
return -1U;
return value;
}
@ -85,7 +86,8 @@ unsigned int x86_pci_read_config16(pci_dev_t dev, unsigned where)
{
uint16_t value;
pci_hose_read_config_word(get_hose(), dev, where, &value);
if (pci_hose_read_config_word(get_hose(), dev, where, &value))
return -1U;
return value;
}
@ -94,7 +96,8 @@ unsigned int x86_pci_read_config32(pci_dev_t dev, unsigned where)
{
uint32_t value;
pci_hose_read_config_dword(get_hose(), dev, where, &value);
if (pci_hose_read_config_dword(get_hose(), dev, where, &value))
return -1U;
return value;
}