linux-kernel - [PATCH] Remove attempt by intel-spi-pci to turn the SPI flash chip writeable

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [thread-next>] [day] [month] [year] [list]

Message-Id: <20200803134449.72502-1-daniel.gutson@eclypsium.com>
Date:   Mon,  3 Aug 2020 10:44:49 -0300
From:   Daniel Gutson <daniel.gutson@...ypsium.com>
To:     Tudor Ambarus <tudor.ambarus@...rochip.com>,
        Miquel Raynal <miquel.raynal@...tlin.com>,
        Richard Weinberger <richard@....at>,
        Vignesh Raghavendra <vigneshr@...com>,
        Mika Westerberg <mika.westerberg@...ux.intel.com>,
        Boris Brezillon <bbrezillon@...nel.org>,
        Daniel Gutson <daniel.gutson@...ypsium.com>,
        linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org,
        Alex Bazhaniuk <alex@...ypsium.com>,
        Richard Hughes <hughsient@...il.com>
Cc:     Arnd Bergmann <arnd@...db.de>,
        Greg Kroah-Hartman <gregkh@...uxfoundation.org>
Subject: [PATCH] Remove attempt by intel-spi-pci to turn the SPI flash chip writeable

Currently, the intel-spi-pci driver tries to unconditionally set
the SPI chip writeable. After discussing in the LKML, the original
author decided that it was better  to remove the attempt.

Context, the intel-spi has a module argument that controls
whether the driver attempts to turn the SPI flash chip writeable.
The default value is FALSE (don't try to make it writeable).
However, this flag applies only for a number of devices, coming from the
platform driver, whereas the devices detected through the PCI driver
(intel-spi-pci) are not subject to this check since the configuration
takes place in intel-spi-pci which doesn't have an argument.

This patch removes the code that attempts to turn the SPI chip writeable.

Signed-off-by: Daniel Gutson <daniel.gutson@...ypsium.com>
---
 drivers/mtd/spi-nor/controllers/intel-spi-pci.c | 6 ------
 1 file changed, 6 deletions(-)

diff --git a/drivers/mtd/spi-nor/controllers/intel-spi-pci.c b/drivers/mtd/spi-nor/controllers/intel-spi-pci.c
index 81329f680bec..d721ba4e8b41 100644
--- a/drivers/mtd/spi-nor/controllers/intel-spi-pci.c
+++ b/drivers/mtd/spi-nor/controllers/intel-spi-pci.c
@@ -41,13 +41,7 @@ static int intel_spi_pci_probe(struct pci_dev *pdev,
 	if (!info)
 		return -ENOMEM;
 
-	/* Try to make the chip read/write */
 	pci_read_config_dword(pdev, BCR, &bcr);
-	if (!(bcr & BCR_WPD)) {
-		bcr |= BCR_WPD;
-		pci_write_config_dword(pdev, BCR, bcr);
-		pci_read_config_dword(pdev, BCR, &bcr);
-	}
 	info->writeable = !!(bcr & BCR_WPD);
 
 	ispi = intel_spi_probe(&pdev->dev, &pdev->resource[0], info);
-- 
2.25.1