wl12xx: fix DMA-API-related warnings

On the PandaBoard (omap_hsmmc + wl12xx_sdio) with DMA_API_DEBUG:

 WARNING: at lib/dma-debug.c:930 check_for_stack.part.8+0x7c/0xe0()
 omap_hsmmc omap_hsmmc.4: DMA-API: device driver maps memory fromstack

Signed-off-by: Mircea Gherzan <mgherzan@gmail.com>
Signed-off-by: Luciano Coelho <coelho@ti.com>

6 files changed, 46 insertions, 17 deletions

diff --git a/drivers/net/wireless/wl12xx/boot.c b/drivers/net/wireless/wl12xx/boot.c
index 954101d03f06..88d60c40b7e3 100644
--- a/drivers/net/wireless/wl12xx/boot.c
+++ b/drivers/net/wireless/wl12xx/boot.c
@@ -83,14 +83,22 @@ static void wl1271_parse_fw_ver(struct wl1271 *wl)
 
 static void wl1271_boot_fw_version(struct wl1271 *wl)
 {
-        struct wl1271_static_data static_data;
+        struct wl1271_static_data *static_data;
 
-        wl1271_read(wl, wl->cmd_box_addr, &static_data, sizeof(static_data),
+        static_data = kmalloc(sizeof(*static_data), GFP_DMA);
+        if (!static_data) {
+                __WARN();
+                return;
+        }
+
+        wl1271_read(wl, wl->cmd_box_addr, static_data, sizeof(*static_data),
                     false);
 
-        strncpy(wl->chip.fw_ver_str, static_data.fw_version,
+        strncpy(wl->chip.fw_ver_str, static_data->fw_version,
                 sizeof(wl->chip.fw_ver_str));
 
+        kfree(static_data);
+
         /* make sure the string is NULL-terminated */
         wl->chip.fw_ver_str[sizeof(wl->chip.fw_ver_str) - 1] = '\0';
 
diff --git a/drivers/net/wireless/wl12xx/cmd.c b/drivers/net/wireless/wl12xx/cmd.c
index 3414fc11e9ba..82cb90a4a99c 100644
--- a/drivers/net/wireless/wl12xx/cmd.c
+++ b/drivers/net/wireless/wl12xx/cmd.c
@@ -342,8 +342,12 @@ int wl1271_cmd_ext_radio_parms(struct wl1271 *wl)
  */
 static int wl1271_cmd_wait_for_event_or_timeout(struct wl1271 *wl, u32 mask)
 {
-        u32 events_vector, event;
+        u32 *events_vector;
+        u32 event;
         unsigned long timeout;
+        int ret = 0;
+
+        events_vector = kmalloc(sizeof(*events_vector), GFP_DMA);
 
         timeout = jiffies + msecs_to_jiffies(WL1271_EVENT_TIMEOUT);
 
@@ -351,21 +355,24 @@ static int wl1271_cmd_wait_for_event_or_timeout(struct wl1271 *wl, u32 mask)
                 if (time_after(jiffies, timeout)) {
                         wl1271_debug(DEBUG_CMD, "timeout waiting for event %d",
                                      (int)mask);
-                        return -ETIMEDOUT;
+                        ret = -ETIMEDOUT;
+                        goto out;
                 }
 
                 msleep(1);
 
                 /* read from both event fields */
-                wl1271_read(wl, wl->mbox_ptr[0], &events_vector,
-                            sizeof(events_vector), false);
-                event = events_vector & mask;
-                wl1271_read(wl, wl->mbox_ptr[1], &events_vector,
-                            sizeof(events_vector), false);
-                event |= events_vector & mask;
+                wl1271_read(wl, wl->mbox_ptr[0], events_vector,
+                            sizeof(*events_vector), false);
+                event = *events_vector & mask;
+                wl1271_read(wl, wl->mbox_ptr[1], events_vector,
+                            sizeof(*events_vector), false);
+                event |= *events_vector & mask;
         } while (!event);
 
-        return 0;
+out:
+        kfree(events_vector);
+        return ret;
 }
 
 static int wl1271_cmd_wait_for_event(struct wl1271 *wl, u32 mask)
diff --git a/drivers/net/wireless/wl12xx/event.c b/drivers/net/wireless/wl12xx/event.c
index 60e6f27566aa..96f06a89c2a9 100644
--- a/drivers/net/wireless/wl12xx/event.c
+++ b/drivers/net/wireless/wl12xx/event.c
@@ -98,8 +98,9 @@ static void wl1271_event_mbox_dump(struct event_mailbox *mbox)
         wl1271_debug(DEBUG_EVENT, "\tmask: 0x%x", mbox->events_mask);
 }
 
-static int wl1271_event_process(struct wl1271 *wl, struct event_mailbox *mbox)
+static int wl1271_event_process(struct wl1271 *wl)
 {
+        struct event_mailbox *mbox = wl->mbox;
         struct ieee80211_vif *vif;
         struct wl12xx_vif *wlvif;
         u32 vector;
@@ -289,7 +290,6 @@ void wl1271_event_mbox_config(struct wl1271 *wl)
 
 int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
 {
-        struct event_mailbox mbox;
         int ret;
 
         wl1271_debug(DEBUG_EVENT, "EVENT on mbox %d", mbox_num);
@@ -298,11 +298,11 @@ int wl1271_event_handle(struct wl1271 *wl, u8 mbox_num)
                 return -EINVAL;
 
         /* first we read the mbox descriptor */
-        wl1271_read(wl, wl->mbox_ptr[mbox_num], &mbox,
-                    sizeof(struct event_mailbox), false);
+        wl1271_read(wl, wl->mbox_ptr[mbox_num], wl->mbox,
+                    sizeof(*wl->mbox), false);
 
         /* process the descriptor */
-        ret = wl1271_event_process(wl, &mbox);
+        ret = wl1271_event_process(wl);
         if (ret < 0)
                 return ret;
 
diff --git a/drivers/net/wireless/wl12xx/event.h b/drivers/net/wireless/wl12xx/event.h
index 057d193d3525..8acba0d43976 100644
--- a/drivers/net/wireless/wl12xx/event.h
+++ b/drivers/net/wireless/wl12xx/event.h
@@ -132,6 +132,8 @@ struct event_mailbox {
         u8 reserved_8[9];
 } __packed;
 
+struct wl1271;
+
 int wl1271_event_unmask(struct wl1271 *wl);
 void wl1271_event_mbox_config(struct wl1271 *wl);
 int wl1271_event_handle(struct wl1271 *wl, u8 mbox);
diff --git a/drivers/net/wireless/wl12xx/main.c b/drivers/net/wireless/wl12xx/main.c
index 13820437806e..7618eb73cb33 100644
--- a/drivers/net/wireless/wl12xx/main.c
+++ b/drivers/net/wireless/wl12xx/main.c
@@ -5375,8 +5375,17 @@ static struct ieee80211_hw *wl1271_alloc_hw(void)
                 goto err_dummy_packet;
         }
 
+        wl->mbox = kmalloc(sizeof(*wl->mbox), GFP_DMA);
+        if (!wl->mbox) {
+                ret = -ENOMEM;
+                goto err_fwlog;
+        }
+
         return hw;
 
+err_fwlog:
+        free_page((unsigned long)wl->fwlog);
+
 err_dummy_packet:
         dev_kfree_skb(wl->dummy_packet);
 
diff --git a/drivers/net/wireless/wl12xx/wl12xx.h b/drivers/net/wireless/wl12xx/wl12xx.h
index 749a15a75d38..82802d1c0782 100644
--- a/drivers/net/wireless/wl12xx/wl12xx.h
+++ b/drivers/net/wireless/wl12xx/wl12xx.h
@@ -34,6 +34,7 @@
 
 #include "conf.h"
 #include "ini.h"
+#include "event.h"
 
 #define WL127X_FW_NAME_MULTI "ti-connectivity/wl127x-fw-4-mr.bin"
 #define WL127X_FW_NAME_SINGLE "ti-connectivity/wl127x-fw-4-sr.bin"
@@ -416,6 +417,8 @@ struct wl1271 {
         /* Hardware recovery work */
         struct work_struct recovery_work;
 
+        struct event_mailbox *mbox;
+
         /* The mbox event mask */
         u32 event_mask;