netdev - Re: [PATCH v3 0/6] PCI/treewide: Cleanup/streamline PCI error code handling

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Message-ID: <20231010223530.GA1005985@bhelgaas>
Date: Tue, 10 Oct 2023 17:35:30 -0500
From: Bjorn Helgaas <helgaas@...nel.org>
To: Ilpo Järvinen <ilpo.jarvinen@...ux.intel.com>
Cc: Rob Herring <robh@...nel.org>, linux-pci@...r.kernel.org,
	linux-kernel@...r.kernel.org, 3chas3@...il.com, brking@...ibm.com,
	dalias@...c.org, glaubitz@...sik.fu-berlin.de,
	ink@...assic.park.msu.ru, jejb@...ux.ibm.com, kw@...ux.com,
	linux-alpha@...r.kernel.org, linux-arm-kernel@...ts.infradead.org,
	linux-atm-general@...ts.sourceforge.net, linux-scsi@...r.kernel.org,
	linux-sh@...r.kernel.org, lpieralisi@...nel.org,
	martin.petersen@...cle.com, mattst88@...il.com,
	netdev@...r.kernel.org, richard.henderson@...aro.org,
	toan@...amperecomputing.com, ysato@...rs.sourceforge.jp,
	Tadeusz Struk <tadeusz.struk@...el.com>
Subject: Re: [PATCH v3 0/6] PCI/treewide: Cleanup/streamline PCI error code
 handling

[+cc Tadeusz; updates to quirk_intel_qat_vf_cap()]

On Mon, Sep 11, 2023 at 03:53:48PM +0300, Ilpo Järvinen wrote:
> As the first step towards converting PCI accessor function return codes
> into normal errnos this series cleans up related code paths which have
> complicated multi-line construct to handle the PCI error checking.
> 
> I'd prefer these (the remaining ones) to be routed through PCI tree due
> to PCI accessor function return code conversion being built on top of
> them.
> 
> v3:
> - Return pci_generic_config_read32()'s error code directly
> - Removed already accepted patches
> 
> v2:
> - Moved ret local var to the inner block (I2C: ali15x3)
> - Removed already accepted patches
> 
> 
> Ilpo Järvinen (6):
>   alpha: Streamline convoluted PCI error handling
>   sh: pci: Do PCI error check on own line
>   atm: iphase: Do PCI error checks on own line
>   PCI: Do error check on own line to split long if conditions
>   PCI: xgene: Do PCI error check on own line & keep return value
>   scsi: ipr: Do PCI error checks on own line
> 
>  arch/alpha/kernel/sys_miata.c      | 17 +++++++++--------
>  arch/sh/drivers/pci/common.c       |  7 ++++---
>  drivers/atm/iphase.c               | 20 +++++++++++---------
>  drivers/pci/controller/pci-xgene.c |  7 ++++---
>  drivers/pci/pci.c                  |  9 ++++++---
>  drivers/pci/probe.c                |  6 +++---
>  drivers/pci/quirks.c               |  6 +++---
>  drivers/scsi/ipr.c                 | 12 ++++++++----
>  8 files changed, 48 insertions(+), 36 deletions(-)

Applied all to pci/config-errs for v6.7, thanks!

I made the tweaks below; heads-up to John Paul and Tadeusz.

Oh, and weird experience applying these via b4, git am: the
Signed-off-by was corrupted on these patches:

  https://lore.kernel.org/r/20230911125354.25501-7-ilpo.jarvinen@linux.intel.com  https://lore.kernel.org/r/20230911125354.25501-6-ilpo.jarvinen@linux.intel.com  https://lore.kernel.org/r/20230911125354.25501-3-ilpo.jarvinen@linux.intel.com

It looked like this:

  Signed-off-by: Ilpo JÃ¤rvinen <ilpo.jarvinen@...ux.intel.com>

Not sure why this happened; maybe one of the mailing lists screwed it
up and the order of arrival determines which one b4 uses?  The ones
from linux-alpha look like:

  Signed-off-by: Ilpo J=C3=A4rvinen <ilpo.jarvinen@...ux.intel.com>

which I think corresponds to the bad rendering.  I think I fixed them
all.

Bjorn

diff --git a/arch/sh/drivers/pci/common.c b/arch/sh/drivers/pci/common.c
index f59e5b9a6a80..ab9e791070b4 100644
--- a/arch/sh/drivers/pci/common.c
+++ b/arch/sh/drivers/pci/common.c
@@ -50,7 +50,7 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
 				int top_bus, int current_bus)
 {
 	u32 pci_devfn;
-	unsigned short vid;
+	u16 vid;
 	int cap66 = -1;
 	u16 stat;
 	int ret;
@@ -64,7 +64,7 @@ int __init pci_is_66mhz_capable(struct pci_channel *hose,
 					     pci_devfn, PCI_VENDOR_ID, &vid);
 		if (ret != PCIBIOS_SUCCESSFUL)
 			continue;
-		if (vid == 0xffff)
+		if (PCI_POSSIBLE_ERROR(vid))
 			continue;
 
 		/* check 66MHz capability */
diff --git a/drivers/pci/quirks.c b/drivers/pci/quirks.c
index 81f3da536a3c..f5fc92441194 100644
--- a/drivers/pci/quirks.c
+++ b/drivers/pci/quirks.c
@@ -5430,7 +5430,7 @@ static void quirk_intel_qat_vf_cap(struct pci_dev *pdev)
 
 		pdev->cfg_size = PCI_CFG_SPACE_EXP_SIZE;
 		ret = pci_read_config_dword(pdev, PCI_CFG_SPACE_SIZE, &status);
-		if ((ret != PCIBIOS_SUCCESSFUL) || (status == 0xffffffff))
+		if ((ret != PCIBIOS_SUCCESSFUL) || (PCI_POSSIBLE_ERROR(status)))
 			pdev->cfg_size = PCI_CFG_SPACE_SIZE;
 
 		if (pci_find_saved_cap(pdev, PCI_CAP_ID_EXP))