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PCI: Align checking of syscall user config accessors 

After 34e3207205 ("PCI: handle positive error codes"),
pci_user_read_config_*() and pci_user_write_config_*() return 0 or negative
errno values, not PCIBIOS_* values like PCIBIOS_SUCCESSFUL or
PCIBIOS_BAD_REGISTER_NUMBER.

Remove comparisons with PCIBIOS_SUCCESSFUL and check only for non-zero.  It
happens that PCIBIOS_SUCCESSFUL is zero, so this is not a functional
change, but it aligns this code with the user accessors.

[bhelgaas: commit log]
Fixes: 34e3207205 ("PCI: handle positive error codes")
Link: https://lore.kernel.org/r/f1220314-e518-1e18-bf94-8e6f8c703758@gmail.com
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
Signed-off-by: Bjorn Helgaas <bhelgaas@google.com>
This commit is contained in:
Heiner Kallweit 2021-01-24 16:39:32 +01:00 committed by Bjorn Helgaas
parent 7c53f6b671
commit ef9e4005cb
1 changed files with 5 additions and 5 deletions
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10
drivers/pci/syscall.c
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@ -20,7 +20,7 @@ SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
u16 word; u16 word;
u32 dword; u32 dword;
long err; long err;
long cfg_ret; int cfg_ret;
if (!capable(CAP_SYS_ADMIN)) if (!capable(CAP_SYS_ADMIN))
return -EPERM; return -EPERM;
@ -46,7 +46,7 @@ SYSCALL_DEFINE5(pciconfig_read, unsigned long, bus, unsigned long, dfn,
} }
err = -EIO; err = -EIO;
if (cfg_ret != PCIBIOS_SUCCESSFUL) if (cfg_ret)
goto error; goto error;
switch (len) { switch (len) {
@ -105,7 +105,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
if (err) if (err)
break; break;
err = pci_user_write_config_byte(dev, off, byte); err = pci_user_write_config_byte(dev, off, byte);
if (err != PCIBIOS_SUCCESSFUL) if (err)
err = -EIO; err = -EIO;
break; break;
@ -114,7 +114,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
if (err) if (err)
break; break;
err = pci_user_write_config_word(dev, off, word); err = pci_user_write_config_word(dev, off, word);
if (err != PCIBIOS_SUCCESSFUL) if (err)
err = -EIO; err = -EIO;
break; break;
@ -123,7 +123,7 @@ SYSCALL_DEFINE5(pciconfig_write, unsigned long, bus, unsigned long, dfn,
if (err) if (err)
break; break;
err = pci_user_write_config_dword(dev, off, dword); err = pci_user_write_config_dword(dev, off, dword);
if (err != PCIBIOS_SUCCESSFUL) if (err)
err = -EIO; err = -EIO;
break; break;