From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id CFFDA1F1313; Tue, 3 Dec 2024 14:37:17 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733236637; cv=none; b=OlZDLCU+REvJAGLx7C9ekTxf4n433zZ726oDjNbl6mPa/m80w5ud8w2/k2XTDGPgpCJDGsMFiaHj6+FsZsiCYj7zQJ29Y/3ybyRY8AT1XTE5AATKQu4vvLgJAOFAXwR1l9HRlcA+eaqjl9uJA++vTs85B6F3DdE6eZv73C2jYGU= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1733236637; c=relaxed/simple; bh=8VSZolyzL/T82uHBp4cu+XVFxONUZC3JZqlsS1edJto=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=VE2OYfhrAnBkZJNMZVeZncdryEVpiHSqxazgaNogAX2lUBQuaFk+8rFX1QSk/G/3WjM7RFIAGR9FFFkXbbV+SgfgMkidNdbGZKmtDFP0yx+06HdeWIXLTRq6/mu4rd8RHDPchEKpKPlBb9LSm2sHO4SER+PsD05Z/1HyxaSYSjg= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=CAcRWi/N; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="CAcRWi/N" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4B11DC4CECF; Tue, 3 Dec 2024 14:37:17 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1733236637; bh=8VSZolyzL/T82uHBp4cu+XVFxONUZC3JZqlsS1edJto=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=CAcRWi/NGBDYFOZYDmytu3BveZyuTIj3xAUnynORmb5EmXbw3N5IEc2fYpFaD74V6 OouP8rdLBJWlxZLrSkewwwQ0eEUmmmn+ZGCZjF4V/kuhgmbv4oPUDnbSk0CA8AVQDZ BV4m0en6ii89vI3G3XUaUenRjS1qQqlw8+MiiyiE= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Naveen Naidu , Bjorn Helgaas , Sasha Levin Subject: [PATCH 4.19 077/138] PCI: cpqphp: Use PCI_POSSIBLE_ERROR() to check config reads Date: Tue, 3 Dec 2024 15:31:46 +0100 Message-ID: <20241203141926.510751136@linuxfoundation.org> X-Mailer: git-send-email 2.47.1 In-Reply-To: <20241203141923.524658091@linuxfoundation.org> References: <20241203141923.524658091@linuxfoundation.org> User-Agent: quilt/0.67 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 4.19-stable review patch. If anyone has any objections, please let me know. ------------------ From: weiyufeng [ Upstream commit a18a025c2fb5fbf2d1d0606ea0d7441ac90e9c39 ] When config pci_ops.read() can detect failed PCI transactions, the data returned to the CPU is PCI_ERROR_RESPONSE (~0 or 0xffffffff). Obviously a successful PCI config read may *also* return that data if a config register happens to contain ~0, so it doesn't definitively indicate an error unless we know the register cannot contain ~0. Use PCI_POSSIBLE_ERROR() to check the response we get when we read data from hardware. This unifies PCI error response checking and makes error checks consistent and easier to find. Link: https://lore.kernel.org/r/b12005c0d57bb9d4c8b486724d078b7bd92f8321.1637243717.git.naveennaidu479@gmail.com Signed-off-by: Naveen Naidu Signed-off-by: Bjorn Helgaas Stable-dep-of: e2226dbc4a49 ("PCI: cpqphp: Fix PCIBIOS_* return value confusion") Signed-off-by: Sasha Levin --- drivers/pci/hotplug/cpqphp_pci.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) diff --git a/drivers/pci/hotplug/cpqphp_pci.c b/drivers/pci/hotplug/cpqphp_pci.c index 1b2b3f3b648bc..a20875da4ec70 100644 --- a/drivers/pci/hotplug/cpqphp_pci.c +++ b/drivers/pci/hotplug/cpqphp_pci.c @@ -138,7 +138,7 @@ static int PCI_RefinedAccessConfig(struct pci_bus *bus, unsigned int devfn, u8 o if (pci_bus_read_config_dword(bus, devfn, PCI_VENDOR_ID, &vendID) == -1) return -1; - if (vendID == 0xffffffff) + if (PCI_POSSIBLE_ERROR(vendID)) return -1; return pci_bus_read_config_dword(bus, devfn, offset, value); } @@ -251,7 +251,7 @@ static int PCI_GetBusDevHelper(struct controller *ctrl, u8 *bus_num, u8 *dev_num *dev_num = tdevice; ctrl->pci_bus->number = tbus; pci_bus_read_config_dword(ctrl->pci_bus, *dev_num, PCI_VENDOR_ID, &work); - if (!nobridge || (work == 0xffffffff)) + if (!nobridge || PCI_POSSIBLE_ERROR(work)) return 0; dbg("bus_num %d devfn %d\n", *bus_num, *dev_num); -- 2.43.0