$ iwconfig mlan0 essid MySSID
[ 36.930000] Path: /sbin/iwconfig
[ 36.930000] CPU: 0 PID: 203 Comm: iwconfig Not tainted 4.7.0 #2
[ 36.940000] task: 866f83a0 ti: 866a6000 task.ti: 866a6000
[ 36.940000]
[ECR ]: 0x00230400 => Misaligned r/w from 0x8677f403
[ 36.960000] [EFA ]: 0x8677f403
[ 36.960000] [BLINK ]: mwifiex_scan_networks+0x17a/0x198c [mwifiex]
[ 36.960000] [ERET ]: mwifiex_scan_networks+0x18a/0x198c [mwifiex]
[ 36.980000] [STAT32]: 0x00000206 : K E2 E1
[ 36.980000] BTA: 0x700736e2 SP: 0x866a7d0c FP: 0x5faddc84
[ 37.000000] LPS: 0x806a37ec LPE: 0x806a37fa LPC: 0x00000000
[ 37.000000] r00: 0x8677f401 r01: 0x8668aa08 r02: 0x00000001
r03: 0x00000000 r04: 0x8668b600 r05: 0x8677f406
r06: 0x8702b600 r07: 0x00000000 r08: 0x8702b600
r09: 0x00000000 r10: 0x870b3b00 r11: 0x00000000
r12: 0x00000000
[ 37.040000]
[ 37.040000] Stack Trace:
[ 37.040000] mwifiex_scan_networks+0x18a/0x198c [mwifiex]
Root cause:
mwifiex driver calls is_zero_ether_addr() against byte-aligned address:
drivers/net/wireless/marvell/mwifiex/fw.h:
struct mwifiex_scan_cmd_config {
/*
* BSS mode to be sent in the firmware command
*/
u8 bss_mode;
/* Specific BSSID used to filter scan results in the firmware */
u8 specific_bssid[ETH_ALEN];
...
} __packed;
drivers/net/wireless/marvell/mwifiex/scan.c:
mwifiex_config_scan(..., struct mwifiex_scan_cmd_config *scan_cfg_out, ...)
...
if (adapter->ext_scan &&
!is_zero_ether_addr(scan_cfg_out->specific_bssid)) {
...
}
Since firmware-related struct mwifiex_scan_cmd_config cannot be changed,
we need to use the new function is_zero_ether_addr_unaligned() here.
This is v2 of the original patch:
[PATCH] Modify is_zero_ether_addr() to handle byte-aligned addresses
Per Joe's suggestion -- instead of modifying is_zero_ether_addr() --
add is_zero_ether_addr_unaligned() and use it where needed.
Cc: Kalle Valo <kvalo@xxxxxxxxxxxxxx>
Cc: David S. Miller <davem@xxxxxxxxxxxxx>
Cc: Joe Perches <joe@xxxxxxxxxxx>
Cc: Amitkumar Karwar <akarwar@xxxxxxxxxxx>
Signed-off-by: Petri Gynther <pgynther@xxxxxxxxxx>
---
drivers/net/wireless/marvell/mwifiex/scan.c | 3 ++-
1 file changed, 2 insertions(+), 1 deletion(-)
diff --git a/drivers/net/wireless/marvell/mwifiex/scan.c b/drivers/net/wireless/marvell/mwifiex/scan.c
index bc5e52c..d648c88 100644
--- a/drivers/net/wireless/marvell/mwifiex/scan.c
+++ b/drivers/net/wireless/marvell/mwifiex/scan.c
@@ -883,7 +883,8 @@ mwifiex_config_scan(struct mwifiex_private *priv,
sizeof(scan_cfg_out->specific_bssid));
if (adapter->ext_scan &&
- !is_zero_ether_addr(scan_cfg_out->specific_bssid)) {
+ !is_zero_ether_addr_unaligned(
+ scan_cfg_out->specific_bssid)) {
bssid_tlv =
(struct mwifiex_ie_types_bssid_list *)tlv_pos;
bssid_tlv->header.type = cpu_to_le16(TLV_TYPE_BSSID);
--
2.8.0.rc3.226.g39d4020
--
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