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 [thread overview] 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
WARNING: multiple messages have this Message-ID (diff)
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>, linux-kernel@vger.kernel.org, linux-crypto@vger.kernel.org, linux-pci@vger.kernel.org, linux-kernel-mentees@lists.linuxfoundation.org Subject: [Linux-kernel-mentees] [RFC PATCH 04/17] hwrng: Drop uses of pci_read_config_*() return value Date: Sat, 1 Aug 2020 13:24:33 +0200 [thread overview] 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 _______________________________________________ Linux-kernel-mentees mailing list Linux-kernel-mentees@lists.linuxfoundation.org https://lists.linuxfoundation.org/mailman/listinfo/linux-kernel-mentees
next prev parent reply other threads:[~2020-08-01 12:24 UTC|newest] Thread overview: 97+ messages / expand[flat|nested] mbox.gz Atom feed top 2020-08-01 11:24 [RFC PATCH 00/17] Drop uses of pci_read_config_*() return value Saheed O. Bolarinwa 2020-08-01 11:24 ` [Intel-gfx] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 01/17] ata: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 02/17] atm: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-05 10:51 ` kernel test robot 2020-08-01 11:24 ` [RFC PATCH 03/17] bcma: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa [this message] 2020-08-01 11:24 ` [Linux-kernel-mentees] [RFC PATCH 04/17] hwrng: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 05/17] dmaengine: ioat: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 06/17] edac: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 21:38 ` kernel test robot 2020-08-01 11:24 ` [RFC PATCH 07/17] fpga: altera-cvp: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 22:32 ` kernel test robot 2020-08-05 12:31 ` kernel test robot 2020-08-01 11:24 ` [RFC PATCH 08/17] gpio: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-18 19:59 ` Bartosz Golaszewski 2020-08-18 19:59 ` [Linux-kernel-mentees] " Bartosz Golaszewski 2020-08-19 2:21 ` Bjorn Helgaas 2020-08-19 2:21 ` [Linux-kernel-mentees] " Bjorn Helgaas 2020-08-01 11:24 ` [RFC PATCH 09/17] drm/i915/vga: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Intel-gfx] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 10/17] hwmon: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-04 21:26 ` Guenter Roeck 2020-08-04 21:26 ` [Linux-kernel-mentees] " Guenter Roeck 2020-08-01 11:24 ` [RFC PATCH 11/17] intel_th: pci: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 12/17] i2c: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 13/17] ide: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 14/17] IB: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 14:18 ` kernel test robot 2020-08-01 11:24 ` [RFC PATCH 15/17] iommu/vt-d: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 16/17] mtd: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 11:24 ` Saheed O. Bolarinwa 2020-08-01 11:24 ` [RFC PATCH 17/17] net: " Saheed O. Bolarinwa 2020-08-01 11:24 ` [Linux-kernel-mentees] " Saheed O. Bolarinwa 2020-08-01 14:58 ` kernel test robot 2020-08-01 12:56 ` [RFC PATCH 00/17] " Borislav Petkov 2020-08-01 12:56 ` [Intel-gfx] " Borislav Petkov 2020-08-01 12:56 ` Borislav Petkov 2020-08-01 12:56 ` [Linux-kernel-mentees] " Borislav Petkov 2020-08-01 12:56 ` Borislav Petkov 2020-08-01 12:56 ` Borislav Petkov 2020-08-02 14:53 ` Tom Rix 2020-08-02 14:53 ` [Intel-gfx] " Tom Rix 2020-08-02 14:53 ` Tom Rix 2020-08-02 14:53 ` [Linux-kernel-mentees] " Tom Rix 2020-08-02 14:53 ` Tom Rix 2020-08-02 14:53 ` Tom Rix 2020-08-02 17:28 ` Saheed Bolarinwa 2020-08-02 17:28 ` [Intel-gfx] " Saheed Bolarinwa 2020-08-02 17:28 ` Saheed Bolarinwa 2020-08-02 17:28 ` [Linux-kernel-mentees] " Saheed Bolarinwa 2020-08-02 17:28 ` Saheed Bolarinwa 2020-08-02 17:28 ` Saheed Bolarinwa 2020-08-02 18:46 ` Borislav Petkov 2020-08-02 18:46 ` [Intel-gfx] " Borislav Petkov 2020-08-02 18:46 ` Borislav Petkov 2020-08-02 18:46 ` [Linux-kernel-mentees] " Borislav Petkov 2020-08-02 18:46 ` Borislav Petkov 2020-08-02 18:46 ` Borislav Petkov 2020-08-02 19:14 ` Bjorn Helgaas 2020-08-02 19:14 ` [Intel-gfx] " Bjorn Helgaas 2020-08-02 19:14 ` Bjorn Helgaas 2020-08-02 19:14 ` [Linux-kernel-mentees] " Bjorn Helgaas 2020-08-02 19:14 ` Bjorn Helgaas 2020-08-02 19:14 ` Bjorn Helgaas 2020-08-02 20:18 ` Borislav Petkov 2020-08-02 20:18 ` [Intel-gfx] " Borislav Petkov 2020-08-02 20:18 ` Borislav Petkov 2020-08-02 20:18 ` [Linux-kernel-mentees] " Borislav Petkov 2020-08-02 20:18 ` Borislav Petkov 2020-08-02 20:18 ` Borislav Petkov 2020-08-03 6:56 ` Christoph Hellwig 2020-08-03 6:56 ` [Intel-gfx] " Christoph Hellwig 2020-08-03 6:56 ` [Linux-kernel-mentees] " Christoph Hellwig 2020-08-03 6:56 ` Christoph Hellwig 2020-08-03 6:56 ` Christoph Hellwig
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