brcmfmac: Limit memory allocs to <64K

Some systems have problems with allocating memory allocation larger
then 64K. Often on unload/load or suspend/resume a failure is
reported: Could not allocate wiphy device. This patch makes the
escan intermediate storage buf dynamically allocated, and smaller
than 64K.

Reviewed-by: Arend Van Spriel <arend@broadcom.com>
Reviewed-by: Franky (Zhenhui) Lin <frankyl@broadcom.com>
Reviewed-by: Pieter-Paul Giesberts <pieterpg@broadcom.com>
Signed-off-by: Hante Meuleman <meuleman@broadcom.com>
Signed-off-by: Arend van Spriel <arend@broadcom.com>
Signed-off-by: Kalle Valo <kvalo@codeaurora.org>

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
index 5a4a0c4..5478128 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.c
@@ -1125,7 +1125,7 @@ brcmf_cfg80211_escan(struct wiphy *wiphy, struct brcmf_cfg80211_vif *vif,
 
        /* Arm scan timeout timer */
        mod_timer(&cfg->escan_timeout, jiffies +
-                       WL_ESCAN_TIMER_INTERVAL_MS * HZ / 1000);
+                       BRCMF_ESCAN_TIMER_INTERVAL_MS * HZ / 1000);
 
        return 0;
 
@@ -3020,7 +3020,7 @@ brcmf_cfg80211_escan_handler(struct brcmf_if *ifp,
 
                list = (struct brcmf_scan_results *)
                                cfg->escan_info.escan_buf;
-               if (bi_length > WL_ESCAN_BUF_SIZE - list->buflen) {
+               if (bi_length > BRCMF_ESCAN_BUF_SIZE - list->buflen) {
                        brcmf_err("Buffer is too small: ignoring\n");
                        goto exit;
                }
@@ -3033,8 +3033,8 @@ brcmf_cfg80211_escan_handler(struct brcmf_if *ifp,
                                                          bss_info_le))
                                goto exit;
                }
-               memcpy(&(cfg->escan_info.escan_buf[list->buflen]),
-                       bss_info_le, bi_length);
+               memcpy(&cfg->escan_info.escan_buf[list->buflen], bss_info_le,
+                      bi_length);
                list->version = le32_to_cpu(bss_info_le->version);
                list->buflen += bi_length;
                list->count++;
@@ -5402,14 +5402,14 @@ static void brcmf_deinit_priv_mem(struct brcmf_cfg80211_info *cfg)
 {
        kfree(cfg->conf);
        cfg->conf = NULL;
-       kfree(cfg->escan_ioctl_buf);
-       cfg->escan_ioctl_buf = NULL;
        kfree(cfg->extra_buf);
        cfg->extra_buf = NULL;
        kfree(cfg->wowl.nd);
        cfg->wowl.nd = NULL;
        kfree(cfg->wowl.nd_info);
        cfg->wowl.nd_info = NULL;
+       kfree(cfg->escan_info.escan_buf);
+       cfg->escan_info.escan_buf = NULL;
 }
 
 static s32 brcmf_init_priv_mem(struct brcmf_cfg80211_info *cfg)
@@ -5417,9 +5417,6 @@ static s32 brcmf_init_priv_mem(struct brcmf_cfg80211_info *cfg)
        cfg->conf = kzalloc(sizeof(*cfg->conf), GFP_KERNEL);
        if (!cfg->conf)
                goto init_priv_mem_out;
-       cfg->escan_ioctl_buf = kzalloc(BRCMF_DCMD_MEDLEN, GFP_KERNEL);
-       if (!cfg->escan_ioctl_buf)
-               goto init_priv_mem_out;
        cfg->extra_buf = kzalloc(WL_EXTRA_BUF_MAX, GFP_KERNEL);
        if (!cfg->extra_buf)
                goto init_priv_mem_out;
@@ -5431,6 +5428,9 @@ static s32 brcmf_init_priv_mem(struct brcmf_cfg80211_info *cfg)
                                    GFP_KERNEL);
        if (!cfg->wowl.nd_info)
                goto init_priv_mem_out;
+       cfg->escan_info.escan_buf = kzalloc(BRCMF_ESCAN_BUF_SIZE, GFP_KERNEL);
+       if (!cfg->escan_info.escan_buf)
+               goto init_priv_mem_out;
 
        return 0;
 

diff --git a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
index 97c327d..01f096f 100644 (file)
--- a/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
+++ b/drivers/net/wireless/broadcom/brcm80211/brcmfmac/cfg80211.h
@@ -28,8 +28,11 @@
 #define WL_ROAM_TRIGGER_LEVEL          -75
 #define WL_ROAM_DELTA                  20
 
-#define WL_ESCAN_BUF_SIZE              (1024 * 64)
-#define WL_ESCAN_TIMER_INTERVAL_MS     10000 /* E-Scan timeout */
+/* Keep BRCMF_ESCAN_BUF_SIZE below 64K (65536). Allocing over 64K can be
+ * problematic on some systems and should be avoided.
+ */
+#define BRCMF_ESCAN_BUF_SIZE           65000
+#define BRCMF_ESCAN_TIMER_INTERVAL_MS  10000   /* E-Scan timeout */
 
 #define WL_ESCAN_ACTION_START          1
 #define WL_ESCAN_ACTION_CONTINUE       2
@@ -205,7 +208,7 @@ enum wl_escan_state {
 
 struct escan_info {
        u32 escan_state;
-       u8 escan_buf[WL_ESCAN_BUF_SIZE];
+       u8 *escan_buf;
        struct wiphy *wiphy;
        struct brcmf_if *ifp;
        s32 (*run)(struct brcmf_cfg80211_info *cfg, struct brcmf_if *ifp,
@@ -278,7 +281,6 @@ struct brcmf_cfg80211_wowl {
  * @escan_info: escan information.
  * @escan_timeout: Timer for catch scan timeout.
  * @escan_timeout_work: scan timeout worker.
- * @escan_ioctl_buf: dongle command buffer for escan commands.
  * @vif_list: linked list of vif instances.
  * @vif_cnt: number of vif instances.
  * @vif_event: vif event signalling.
@@ -309,7 +311,6 @@ struct brcmf_cfg80211_info {
        struct escan_info escan_info;
        struct timer_list escan_timeout;
        struct work_struct escan_timeout_work;
-       u8 *escan_ioctl_buf;
        struct list_head vif_list;
        struct brcmf_cfg80211_vif_event vif_event;
        struct completion vif_disabled;