rtlwifi: Move 2 large arrays off stack

In driver rtlwifi, efuse_read() places two relatively large arrays on the
stack - a 1D u8 array of size 128, and a 2D array of u16 with 128 * 4 elements.
With driver rtl8192de, the sizes will be 256 and 256 * 4 respectively. As that
will make the 2D array be 2048 bytes, I have changed the code to use kmalloc to
allocate the space.

Signed-off-by: Larry Finger <Larry.Finger@lwfinger.net>
Signed-off-by: John W. Linville <linville@tuxdriver.com>

1 files changed, 28 insertions, 7 deletions

diff --git a/drivers/net/wireless/rtlwifi/efuse.c b/drivers/net/wireless/rtlwifi/efuse.c
index 510d42edb8ca..50de6f5d8a56 100644
--- a/drivers/net/wireless/rtlwifi/efuse.c
+++ b/drivers/net/wireless/rtlwifi/efuse.c
@@ -235,7 +235,7 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
 {
         struct rtl_priv *rtlpriv = rtl_priv(hw);
         struct rtl_efuse *rtlefuse = rtl_efuse(rtl_priv(hw));
-        u8 efuse_tbl[HWSET_MAX_SIZE];
+        u8 *efuse_tbl;
         u8 rtemp8[1];
         u16 efuse_addr = 0;
         u8 offset, wren;
@@ -245,7 +245,7 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
                 rtlpriv->cfg->maps[EFUSE_MAX_SECTION_MAP];
         const u32 efuse_len =
                 rtlpriv->cfg->maps[EFUSE_REAL_CONTENT_SIZE];
-        u16 efuse_word[EFUSE_MAX_SECTION][EFUSE_MAX_WORD_UNIT];
+        u16 **efuse_word;
         u16 efuse_utilized = 0;
         u8 efuse_usage;
 
@@ -256,9 +256,24 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
                 return;
         }
 
+        /* allocate memory for efuse_tbl and efuse_word */
+        efuse_tbl = kmalloc(rtlpriv->cfg->maps[EFUSE_HWSET_MAX_SIZE] *
+                            sizeof(u8), GFP_ATOMIC);
+        if (!efuse_tbl)
+                return;
+        efuse_word = kmalloc(EFUSE_MAX_WORD_UNIT * sizeof(u16 *), GFP_ATOMIC);
+        if (!efuse_word)
+                goto done;
+        for (i = 0; i < EFUSE_MAX_WORD_UNIT; i++) {
+                efuse_word[i] = kmalloc(efuse_max_section * sizeof(u16),
+                                        GFP_ATOMIC);
+                if (!efuse_word[i])
+                        goto done;
+        }
+
         for (i = 0; i < efuse_max_section; i++)
                 for (j = 0; j < EFUSE_MAX_WORD_UNIT; j++)
-                        efuse_word[i][j] = 0xFFFF;
+                        efuse_word[j][i] = 0xFFFF;
 
         read_efuse_byte(hw, efuse_addr, rtemp8);
         if (*rtemp8 != 0xFF) {
@@ -285,7 +300,8 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
                                         read_efuse_byte(hw, efuse_addr, rtemp8);
                                         efuse_addr++;
                                         efuse_utilized++;
-                                        efuse_word[offset][i] = (*rtemp8 & 0xff);
+                                        efuse_word[i][offset] =
+                                                         (*rtemp8 & 0xff);
 
                                         if (efuse_addr >= efuse_len)
                                                 break;
@@ -297,7 +313,7 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
                                         read_efuse_byte(hw, efuse_addr, rtemp8);
                                         efuse_addr++;
                                         efuse_utilized++;
-                                        efuse_word[offset][i] |=
+                                        efuse_word[i][offset] |=
                                             (((u16)*rtemp8 << 8) & 0xff00);
 
                                         if (efuse_addr >= efuse_len)
@@ -320,9 +336,9 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
         for (i = 0; i < efuse_max_section; i++) {
                 for (j = 0; j < EFUSE_MAX_WORD_UNIT; j++) {
                         efuse_tbl[(i * 8) + (j * 2)] =
-                            (efuse_word[i][j] & 0xff);
+                            (efuse_word[j][i] & 0xff);
                         efuse_tbl[(i * 8) + ((j * 2) + 1)] =
-                            ((efuse_word[i][j] >> 8) & 0xff);
+                            ((efuse_word[j][i] >> 8) & 0xff);
                 }
         }
 
@@ -336,6 +352,11 @@ void read_efuse(struct ieee80211_hw *hw, u16 _offset, u16 _size_byte, u8 *pbuf)
                                       (u8 *)&efuse_utilized);
         rtlpriv->cfg->ops->set_hw_reg(hw, HW_VAR_EFUSE_USAGE,
                                       (u8 *)&efuse_usage);
+done:
+        for (i = 0; i < EFUSE_MAX_WORD_UNIT; i++)
+                kfree(efuse_word[i]);
+        kfree(efuse_word);
+        kfree(efuse_tbl);
 }
 
 bool efuse_shadow_update_chk(struct ieee80211_hw *hw)