linux-kernel - Re: [PATCH v2 1/2] PCI: endpoint: pci-epf-test: Make use of cached 'epc_features' in pci_epf_test_core

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Message-ID: <20240517110638.GM202520@rocinante>
Date: Fri, 17 May 2024 20:06:38 +0900
From: Krzysztof Wilczyński <kw@...ux.com>
To: Manivannan Sadhasivam <manivannan.sadhasivam@...aro.org>
Cc: Kishon Vijay Abraham I <kishon@...nel.org>,
	Bjorn Helgaas <bhelgaas@...gle.com>,
	Lorenzo Pieralisi <lpieralisi@...nel.org>,
	linux-pci@...r.kernel.org, linux-kernel@...r.kernel.org,
	Niklas Cassel <cassel@...nel.org>,
	Dan Carpenter <dan.carpenter@...aro.org>
Subject: Re: [PATCH v2 1/2] PCI: endpoint: pci-epf-test: Make use of cached
 'epc_features' in pci_epf_test_core_init()

Hello,

> Instead of getting the epc_features from pci_epc_get_features() API, use
> the cached pci_epf_test::epc_features value to avoid the NULL check. Since
> the NULL check is already performed in pci_epf_test_bind(), having one more
> check in pci_epf_test_core_init() is redundant and it is not possible to
> hit the NULL pointer dereference.
> 
> Also with commit a01e7214bef9 ("PCI: endpoint: Remove "core_init_notifier"
> flag"), 'epc_features' got dereferenced without the NULL check, leading to
> the following false positive smatch warning:
> 
> drivers/pci/endpoint/functions/pci-epf-test.c:784 pci_epf_test_core_init()
> error: we previously assumed 'epc_features' could be null (see line 747)
> 
> So let's remove the redundant NULL check and also use the epc_features::
> {msix_capable/msi_capable} flags directly to avoid local variables.

Applied to endpoint, thank you!

[01/02] PCI: endpoint: pci-epf-test: Make use of cached 'epc_features' in pci_epf_test_core_init()
        https://git.kernel.org/pci/pci/c/3acb072c2433
[02/02] PCI: endpoint: pci-epf-test: Use 'msix_capable' flag directly in pci_epf_test_alloc_space()
        https://git.kernel.org/pci/pci/c/e79d1b1eb626

	Krzysztof