linux-kernel - Re: [PATCH] PCI: mvebu: Fix the use of the for_each_of

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Message-ID: <pedyo2xru5fmbh6ordly2o3gj63k2vakheqp75ri47mzuupi66@qchlw4pmwhny>
Date: Wed, 3 Sep 2025 19:33:30 +0200
From: Jan Palus <jpalus@...tmail.com>
To: Klaus Kudielka <klaus.kudielka@...il.com>
Cc: Thomas Petazzoni <thomas.petazzoni@...tlin.com>, 
	Pali Rohár <pali@...nel.org>, Lorenzo Pieralisi <lpieralisi@...nel.org>, 
	Krzysztof Wilczyński <kwilczynski@...nel.org>, Manivannan Sadhasivam <mani@...nel.org>, 
	Rob Herring <robh@...nel.org>, Bjorn Helgaas <bhelgaas@...gle.com>, linux-pci@...r.kernel.org, 
	linux-arm-kernel@...ts.infradead.org, linux-kernel@...r.kernel.org, Bjorn Helgaas <helgaas@...nel.org>
Subject: Re: [PATCH] PCI: mvebu: Fix the use of the for_each_of_range()
 iterator

On 02.09.2025 17:13, Klaus Kudielka wrote:
> The blamed commit simplifies code, by using the for_each_of_range()
> iterator. But it results in no pci devices being detected anymore on
> Turris Omnia (and probably other mvebu targets).
> 
> Analysis:
> 
> To determine range.flags, of_pci_range_parser_one() uses bus->get_flags(),
> which resolves to of_bus_pci_get_flags(). That function already returns an
> IORESOURCE bit field, and NOT the original flags from the "ranges"
> resource.
> 
> Then mvebu_get_tgt_attr() attempts the very same conversion again.
> But this is a misinterpretation of range.flags.
> 
> Remove the misinterpretation of range.flags in mvebu_get_tgt_addr(),
                                                               ^^^^

Just noticed the typo. Should be mvebu_get_tgt_attr().

> to restore the intended behavior.
> 
> Signed-off-by: Klaus Kudielka <klaus.kudielka@...il.com>
> Fixes: 5da3d94a23c6 ("PCI: mvebu: Use for_each_of_range() iterator for parsing "ranges"")
> Reported-by: Bjorn Helgaas <helgaas@...nel.org>
> Closes: https://lore.kernel.org/r/20250820184603.GA633069@bhelgaas/
> Reported-by: Jan Palus <jpalus@...tmail.com>
> Closes: https://bugzilla.kernel.org/show_bug.cgi?id=220479
> ---
>  drivers/pci/controller/pci-mvebu.c | 14 ++------------
>  1 file changed, 2 insertions(+), 12 deletions(-)