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(p200300ea8f384600dc152d5047c3384f.dip0.t-ipconnect.de. [2003:ea:8f38:4600:dc15:2d50:47c3:384f]) by smtp.googlemail.com with ESMTPSA id 136sm1858456wmb.7.2021.05.13.13.59.04 (version=TLS1_3 cipher=TLS_AES_128_GCM_SHA256 bits=128/128); Thu, 13 May 2021 13:59:06 -0700 (PDT) Subject: [PATCH 1/5] PCI/VPD: Refactor pci_vpd_size From: Heiner Kallweit To: Bjorn Helgaas Cc: "linux-pci@vger.kernel.org" References: Message-ID: <1cdda5f1-e1ea-af9f-cfbe-952b7d37e246@gmail.com> Date: Thu, 13 May 2021 22:58:40 +0200 User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:78.0) Gecko/20100101 Thunderbird/78.10.1 MIME-Version: 1.0 In-Reply-To: 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 The only Short Resource Data Type tag is the end tag. This allows to remove the generic SRDT tag handling and the code be significantly simplified. Signed-off-by: Heiner Kallweit --- drivers/pci/vpd.c | 46 ++++++++++++---------------------------------- 1 file changed, 12 insertions(+), 34 deletions(-) diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c index 26bf7c877..ecdce170f 100644 --- a/drivers/pci/vpd.c +++ b/drivers/pci/vpd.c @@ -73,50 +73,28 @@ EXPORT_SYMBOL(pci_write_vpd); static size_t pci_vpd_size(struct pci_dev *dev, size_t old_size) { size_t off = 0; - unsigned char header[1+2]; /* 1 byte tag, 2 bytes length */ + u8 header[3]; /* 1 byte tag, 2 bytes length */ while (off < old_size && pci_read_vpd(dev, off, 1, header) == 1) { - unsigned char tag; - if (!header[0] && !off) { pci_info(dev, "Invalid VPD tag 00, assume missing optional VPD EPROM\n"); return 0; } - if (header[0] & PCI_VPD_LRDT) { - /* Large Resource Data Type Tag */ - tag = pci_vpd_lrdt_tag(header); - /* Only read length from known tag items */ - if ((tag == PCI_VPD_LTIN_ID_STRING) || - (tag == PCI_VPD_LTIN_RO_DATA) || - (tag == PCI_VPD_LTIN_RW_DATA)) { - if (pci_read_vpd(dev, off+1, 2, - &header[1]) != 2) { - pci_warn(dev, "invalid large VPD tag %02x size at offset %zu", - tag, off + 1); - return 0; - } - off += PCI_VPD_LRDT_TAG_SIZE + - pci_vpd_lrdt_size(header); - } - } else { - /* Short Resource Data Type Tag */ - off += PCI_VPD_SRDT_TAG_SIZE + - pci_vpd_srdt_size(header); - tag = pci_vpd_srdt_tag(header); - } - - if (tag == PCI_VPD_STIN_END) /* End tag descriptor */ - return off; + if (header[0] == PCI_VPD_SRDT_END) + return off + PCI_VPD_SRDT_TAG_SIZE; - if ((tag != PCI_VPD_LTIN_ID_STRING) && - (tag != PCI_VPD_LTIN_RO_DATA) && - (tag != PCI_VPD_LTIN_RW_DATA)) { - pci_warn(dev, "invalid %s VPD tag %02x at offset %zu", - (header[0] & PCI_VPD_LRDT) ? "large" : "short", - tag, off); + if (header[0] != PCI_VPD_LRDT_ID_STRING && + header[0] != PCI_VPD_LRDT_RO_DATA && + header[0] != PCI_VPD_LRDT_RW_DATA) { + pci_warn(dev, "invalid VPD tag %02x at offset %zu", header[0], off); return 0; } + + if (pci_read_vpd(dev, off + 1, 2, header + 1) != 2) + return 0; + + off += PCI_VPD_LRDT_TAG_SIZE + pci_vpd_lrdt_size(header); } return 0; } -- 2.31.1