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From: =?UTF-8?q?Rafa=C5=82=20Mi=C5=82ecki?= <zajec5@gmail.com>
Date: Wed, 20 May 2015 11:01:08 +0200
Subject: [PATCH] brcmfmac: simplify check finding NVRAM v1 device path
MIME-Version: 1.0
Content-Type: text/plain; charset=UTF-8
Content-Transfer-Encoding: 8bit
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>
---
--- a/drivers/net/wireless/brcm80211/brcmfmac/firmware.c
+++ b/drivers/net/wireless/brcm80211/brcmfmac/firmware.c
@@ -222,6 +222,10 @@ static int brcmf_init_nvram_parser(struc
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(stru
/* 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) {
@@ -245,13 +252,10 @@ static void brcmf_fw_strip_multi_v1(stru
* 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)) {
- id = nvp->nvram[i + 7] - '0';
- found = true;
- break;
- }
+ (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++;
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