Update compat-wireless to 2.6.36-5-spn

chromeos/compat-wireless/drivers/net/wireless/ath/ath9k/ar9003_paprd.c

 /*
  * Copyright (c) 2010 Atheros Communications Inc.
  *
  * Permission to use, copy, modify, and/or distribute this software for any
  * purpose with or without fee is hereby granted, provided that the above
  * copyright notice and this permission notice appear in all copies.
  *
  * THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
  * WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
  * MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
@@ skipping 329 matching lines @@
         scale_factor = 8;
 
         /* low signal gain */
         if (x_est[6] == x_est[3])
                 return false;
 
         G_fxp =
             (((Y[6] - Y[3]) * 1 << scale_factor) +
              (x_est[6] - x_est[3])) / (x_est[6] - x_est[3]);
 
+        /* prevent division by zero */
+        if (G_fxp == 0)
+                return false;
+
         Y_intercept =
             (G_fxp * (x_est[0] - x_est[3]) +
              (1 << scale_factor)) / (1 << scale_factor) + Y[3];
 
         for (i = 0; i <= max_index; i++)
                 y_est[i] = Y[i] - Y_intercept;
 
         for (i = 0; i <= 3; i++) {
                 y_est[i] = i * 32;
-
-                /* prevent division by zero */
-                if (G_fxp == 0)
-                        return false;
-
                 x_est[i] = ((y_est[i] * 1 << scale_factor) + G_fxp) / G_fxp;
         }
 
+        if (y_est[max_index] == 0)
+                return false;
+
         x_est_fxp1_nonlin =
             x_est[max_index] - ((1 << scale_factor) * y_est[max_index] +
                                 G_fxp) / G_fxp;
 
         order_x_by_y =
             (x_est_fxp1_nonlin + y_est[max_index]) / y_est[max_index];
 
         if (order_x_by_y == 0)
                 M = 10;
         else if (order_x_by_y == 1)
@@ skipping 73 matching lines @@
                 beta_raw = beta_raw + B1_tmp[i] * x_tilde[i];
                 alpha_raw = alpha_raw + B2_tmp[i] * x_tilde[i];
         }
 
         scale_B =
             ((sum_y_quad / scale_factor) * (L + 1) -
              (sum_y_sqr / scale_factor) * sum_y_sqr) * scale_factor;
 
         Q_scale_B = find_proper_scale(find_expn(abs(scale_B)), 10);
         scale_B = scale_B / (1 << Q_scale_B);
+        if (scale_B == 0)
+                return false;
         Q_beta = find_proper_scale(find_expn(abs(beta_raw)), 10);
         Q_alpha = find_proper_scale(find_expn(abs(alpha_raw)), 10);
         beta_raw = beta_raw / (1 << Q_beta);
         alpha_raw = alpha_raw / (1 << Q_alpha);
         alpha = (alpha_raw << 10) / scale_B;
         beta = (beta_raw << 10) / scale_B;
         order_1 = 3 * M - Q_x - Q_B1 - Q_beta + 10 + Q_scale_B;
         order_2 = 3 * M - Q_x - Q_B2 - Q_alpha + 10 + Q_scale_B;
         order1_5x = order_1 / 5;
         order2_3x = order_2 / 3;
@@ skipping 236 matching lines @@
         return 0;
 }
 EXPORT_SYMBOL(ar9003_paprd_init_table);
 
 bool ar9003_paprd_is_done(struct ath_hw *ah)
 {
         return !!REG_READ_FIELD(ah, AR_PHY_PAPRD_TRAINER_STAT1,
                                 AR_PHY_PAPRD_TRAINER_STAT1_PAPRD_TRAIN_DONE);
 }
 EXPORT_SYMBOL(ar9003_paprd_is_done);