xhci: Fix an error in count_sg_trbs_needed()
[linux-2.6.git] / drivers / pci / vpd.c
1 /*
2  * File:        vpd.c
3  * Purpose:     Provide PCI VPD support
4  *
5  * Copyright (C) 2010 Broadcom Corporation.
6  */
7
8 #include <linux/pci.h>
9
10 int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
11 {
12         int i;
13
14         for (i = off; i < len; ) {
15                 u8 val = buf[i];
16
17                 if (val & PCI_VPD_LRDT) {
18                         /* Don't return success of the tag isn't complete */
19                         if (i + PCI_VPD_LRDT_TAG_SIZE > len)
20                                 break;
21
22                         if (val == rdt)
23                                 return i;
24
25                         i += PCI_VPD_LRDT_TAG_SIZE +
26                              pci_vpd_lrdt_size(&buf[i]);
27                 } else {
28                         u8 tag = val & ~PCI_VPD_SRDT_LEN_MASK;
29
30                         if (tag == rdt)
31                                 return i;
32
33                         if (tag == PCI_VPD_SRDT_END)
34                                 break;
35
36                         i += PCI_VPD_SRDT_TAG_SIZE +
37                              pci_vpd_srdt_size(&buf[i]);
38                 }
39         }
40
41         return -ENOENT;
42 }
43 EXPORT_SYMBOL_GPL(pci_vpd_find_tag);
44
45 int pci_vpd_find_info_keyword(const u8 *buf, unsigned int off,
46                               unsigned int len, const char *kw)
47 {
48         int i;
49
50         for (i = off; i + PCI_VPD_INFO_FLD_HDR_SIZE <= off + len;) {
51                 if (buf[i + 0] == kw[0] &&
52                     buf[i + 1] == kw[1])
53                         return i;
54
55                 i += PCI_VPD_INFO_FLD_HDR_SIZE +
56                      pci_vpd_info_field_size(&buf[i]);
57         }
58
59         return -ENOENT;
60 }
61 EXPORT_SYMBOL_GPL(pci_vpd_find_info_keyword);