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[2003:ea:8f10:c200:7101:8b48:5eab:cb5f]) by smtp.googlemail.com with ESMTPSA id s2sm14818985wmh.46.2021.08.08.10.21.02 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Sun, 08 Aug 2021 10:21:05 -0700 (PDT) Subject: [PATCH 3/6] PCI/VPD: Remove member valid from struct pci_vpd From: Heiner Kallweit To: Bjorn Helgaas Cc: "linux-pci@vger.kernel.org" References: <1e61d5dc-824c-e855-01eb-6c7f45c55285@gmail.com> Message-ID: <9f777bc7-5316-e1b8-e5d4-f9f609bdb5dd@gmail.com> Date: Sun, 8 Aug 2021 19:21:02 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.12.0 MIME-Version: 1.0 In-Reply-To: <1e61d5dc-824c-e855-01eb-6c7f45c55285@gmail.com> Content-Type: text/plain; charset=utf-8 Content-Language: en-US Content-Transfer-Encoding: 7bit Precedence: bulk List-ID: X-Mailing-List: linux-pci@vger.kernel.org Instead of having a separate flag let's use vp->len != 0 as indicator that VPD validity has been checked. Now vpd->len == PCI_VPD_SZ_INVALID is used to indicate that VPD is invalid. Signed-off-by: Heiner Kallweit --- drivers/pci/vpd.c | 29 ++++++++++++----------------- 1 file changed, 12 insertions(+), 17 deletions(-) diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c index 6a0d617b2..d6c216caf 100644 --- a/drivers/pci/vpd.c +++ b/drivers/pci/vpd.c @@ -17,7 +17,6 @@ struct pci_vpd { struct mutex lock; unsigned int len; u8 cap; - unsigned int valid:1; }; static struct pci_dev *pci_get_func0_dev(struct pci_dev *dev) @@ -25,7 +24,8 @@ static struct pci_dev *pci_get_func0_dev(struct pci_dev *dev) return pci_get_slot(dev->bus, PCI_DEVFN(PCI_SLOT(dev->devfn), 0)); } -#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1) +#define PCI_VPD_MAX_SIZE (PCI_VPD_ADDR_MASK + 1) +#define PCI_VPD_SZ_INVALID UINT_MAX /** * pci_vpd_size - determine actual size of Vital Product Data @@ -36,6 +36,9 @@ static size_t pci_vpd_size(struct pci_dev *dev) size_t off = 0; unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */ + /* Otherwise the following reads would fail. */ + dev->vpd->len = PCI_VPD_MAX_SIZE; + while (pci_read_vpd(dev, off, 1, header) == 1) { unsigned char tag; size_t size; @@ -48,7 +51,7 @@ static size_t pci_vpd_size(struct pci_dev *dev) if (pci_read_vpd(dev, off + 1, 2, &header[1]) != 2) { pci_warn(dev, "failed VPD read at offset %zu\n", off + 1); - return off; + return off ?: PCI_VPD_SZ_INVALID; } size = pci_vpd_lrdt_size(header); if (off + size > PCI_VPD_MAX_SIZE) @@ -73,7 +76,7 @@ static size_t pci_vpd_size(struct pci_dev *dev) pci_info(dev, "invalid VPD tag %#04x at offset %zu%s\n", header[0], off, off == 0 ? "; assume missing optional EEPROM" : ""); - return off; + return off ?: PCI_VPD_SZ_INVALID; } /* @@ -130,12 +133,10 @@ static ssize_t pci_vpd_read(struct pci_dev *dev, loff_t pos, size_t count, if (pos < 0) return -EINVAL; - if (!vpd->valid) { - vpd->valid = 1; + if (!vpd->len) vpd->len = pci_vpd_size(dev); - } - if (vpd->len == 0) + if (vpd->len == PCI_VPD_SZ_INVALID) return -EIO; if (pos > vpd->len) @@ -201,12 +202,10 @@ static ssize_t pci_vpd_write(struct pci_dev *dev, loff_t pos, size_t count, if (pos < 0 || (pos & 3) || (count & 3)) return -EINVAL; - if (!vpd->valid) { - vpd->valid = 1; + if (!vpd->len) vpd->len = pci_vpd_size(dev); - } - if (vpd->len == 0) + if (vpd->len == PCI_VPD_SZ_INVALID) return -EIO; if (end > vpd->len) @@ -255,10 +254,8 @@ void pci_vpd_init(struct pci_dev *dev) if (!vpd) return; - vpd->len = PCI_VPD_MAX_SIZE; mutex_init(&vpd->lock); vpd->cap = cap; - vpd->valid = 0; dev->vpd = vpd; } @@ -423,8 +420,7 @@ DECLARE_PCI_FIXUP_CLASS_EARLY(PCI_VENDOR_ID_INTEL, PCI_ANY_ID, static void quirk_blacklist_vpd(struct pci_dev *dev) { if (dev->vpd) { - dev->vpd->len = 0; - dev->vpd->valid = 1; + dev->vpd->len = PCI_VPD_SZ_INVALID; pci_warn(dev, FW_BUG "disabling VPD access (can't determine size of non-standard VPD format)\n"); } } @@ -455,7 +451,6 @@ static void pci_vpd_set_size(struct pci_dev *dev, size_t len) if (!vpd || len == 0 || len > PCI_VPD_MAX_SIZE) return; - vpd->valid = 1; vpd->len = len; } -- 2.32.0