[Linux-kernel-mentees] [RFC PATCH 04/17] hwrng: Drop uses of pci_read_config_*() return value

Saheed O. Bolarinwa refactormyself at gmail.com
Sat Aug 1 11:24:33 UTC 2020

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 <bjorn at helgaas.com>
Signed-off-by: Saheed O. Bolarinwa <refactormyself at gmail.com>
 drivers/char/hw_random/amd-rng.c | 6 +++---
 1 file changed, 3 insertions(+), 3 deletions(-)

diff --git a/drivers/char/hw_random/amd-rng.c b/drivers/char/hw_random/amd-rng.c
index 9959c762da2f..e7bf17eedaa0 100644
--- a/drivers/char/hw_random/amd-rng.c
+++ b/drivers/char/hw_random/amd-rng.c
@@ -141,9 +141,9 @@ static int __init mod_init(void)
 	return -ENODEV;
-	err = pci_read_config_dword(pdev, 0x58, &pmbase);
-	if (err)
-		return err;
+	pci_read_config_dword(pdev, 0x58, &pmbase);
+	if (pmbase == (u32)~0)
+		return -ENODEV;
 	pmbase &= 0x0000FF00;
 	if (pmbase == 0)

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