Linux-Crypto Archive on lore.kernel.org
 help / color / Atom feed
From: "Saheed O. Bolarinwa" <refactormyself@gmail.com>
To: helgaas@kernel.org, Matt Mackall <mpm@selenic.com>,
	Herbert Xu <herbert@gondor.apana.org.au>,
	Arnd Bergmann <arnd@arndb.de>,
	Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Cc: "Saheed O. Bolarinwa" <refactormyself@gmail.com>,
	bjorn@helgaas.com, skhan@linuxfoundation.org,
	linux-kernel-mentees@lists.linuxfoundation.org,
	linux-pci@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-crypto@vger.kernel.org
Subject: [RFC PATCH 04/17] hwrng: Drop uses of pci_read_config_*() return value
Date: Sat,  1 Aug 2020 13:24:33 +0200
Message-ID: <20200801112446.149549-5-refactormyself@gmail.com> (raw)
In-Reply-To: <20200801112446.149549-1-refactormyself@gmail.com>

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@helgaas.com>
Signed-off-by: Saheed O. Bolarinwa <refactormyself@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;
 
 found:
-	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)
-- 
2.18.4


  reply index

Thread overview: 9+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-01 11:24 [RFC PATCH 00/17] " Saheed O. Bolarinwa
2020-08-01 11:24 ` Saheed O. Bolarinwa [this message]
2020-08-01 12:56 ` Borislav Petkov
2020-08-02 14:53   ` Tom Rix
2020-08-02 17:28   ` Saheed Bolarinwa
2020-08-02 18:46     ` Borislav Petkov
2020-08-02 19:14       ` Bjorn Helgaas
2020-08-02 20:18         ` Borislav Petkov
2020-08-03  6:56         ` Christoph Hellwig

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=20200801112446.149549-5-refactormyself@gmail.com \
    --to=refactormyself@gmail.com \
    --cc=arnd@arndb.de \
    --cc=bjorn@helgaas.com \
    --cc=gregkh@linuxfoundation.org \
    --cc=helgaas@kernel.org \
    --cc=herbert@gondor.apana.org.au \
    --cc=linux-crypto@vger.kernel.org \
    --cc=linux-kernel-mentees@lists.linuxfoundation.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=linux-pci@vger.kernel.org \
    --cc=mpm@selenic.com \
    --cc=skhan@linuxfoundation.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link

Linux-Crypto Archive on lore.kernel.org

Archives are clonable:
	git clone --mirror https://lore.kernel.org/linux-crypto/0 linux-crypto/git/0.git

	# If you have public-inbox 1.1+ installed, you may
	# initialize and index your mirror using the following commands:
	public-inbox-init -V2 linux-crypto linux-crypto/ https://lore.kernel.org/linux-crypto \
		linux-crypto@vger.kernel.org
	public-inbox-index linux-crypto

Example config snippet for mirrors

Newsgroup available over NNTP:
	nntp://nntp.lore.kernel.org/org.kernel.vger.linux-crypto


AGPL code for this site: git clone https://public-inbox.org/public-inbox.git