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brcmfmac: simplify check finding NVRAM v1 device path

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With a simple use of snprintf and small buffer we can compare NVRAM
entry value with a full string. This way we avoid checking random chars
at magic offsets.
Tested on BCM43602 with NVRAM hacked to use v1 format.

Signed-off-by: Rafał Miłecki <zajec5@gmail.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>
This commit is contained in:
Rafał Miłecki 2015-05-20 11:01:08 +02:00 committed by Kalle Valo
parent ae8c2366d7
commit 5d08408b6f
1 changed files with 11 additions and 7 deletions
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12
drivers/net/wireless/brcm80211/brcmfmac/firmware.c
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@ -222,6 +222,10 @@ static int brcmf_init_nvram_parser(struct nvram_parser *nvp,
static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr,
u16 bus_nr)
{
/* Device path with a leading '=' key-value separator */
char pcie_path[] = "=pcie/?/?";
size_t pcie_len;
u32 i, j;
bool found;
u8 *nvram;
@ -238,6 +242,9 @@ static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr,
/* First search for the devpathX and see if it is the configuration
* for domain_nr/bus_nr. Search complete nvp
*/
snprintf(pcie_path, sizeof(pcie_path), "=pcie/%d/%d", domain_nr,
bus_nr);
pcie_len = strlen(pcie_path);
found = false;
i = 0;
while (i < nvp->nvram_len - BRCMF_FW_NVRAM_DEVPATH_LEN) {
@ -245,14 +252,11 @@ static void brcmf_fw_strip_multi_v1(struct nvram_parser *nvp, u16 domain_nr,
* Y = domain_nr, Z = bus_nr, X = virtual ID
*/
if ((strncmp(&nvp->nvram[i], "devpath", 7) == 0) &&
(strncmp(&nvp->nvram[i + 8], "=pcie/", 6) == 0)) {
if (((nvp->nvram[i + 14] - '0') == domain_nr) &&
((nvp->nvram[i + 16] - '0') == bus_nr)) {
(strncmp(&nvp->nvram[i + 8], pcie_path, pcie_len) == 0)) {
id = nvp->nvram[i + 7] - '0';
found = true;
break;
}
}
while (nvp->nvram[i] != 0)
i++;
i++;